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j4fs driver is now OpenSource

Big news for every hacker on Samsung devices! j4fs driver is now OpenSource Enjoy: http://bit.ly/jatK1c
Click to expand...
Click to collapse
http://romkitchen.org/sgs/?s=home
Someone care to explain the benefits, if any, of this? My understanding from what little i read is it will help with kernal development on a decent number of samsung devices.
Edit: as in should i be "super excited", "meh", or "cool beans".

second that question .. does this help us?

Would this driver be the one that controls download mode?
Sent from my GT-I9000 using XDA Premium App

Maybe this?
added: Should have checked supercurio's github
Samsung v1 GT-I9100 sources: [common] param.lfs/j4fs driver (communication with bootloader), now OpenSource, yay!

google :
j4fs...
its a filesystem.... FACT
So my GUESS...
a driver for a filesystem...
like ext4 and fat drivers for handling our other storage..
a new filesystem for us to tweak the crap out of and use..?
though ive been wrong before. that is only a logical conclusion not a factual statement

TRusselo said:
google :
j4fs...
its a filesystem.... FACT
So my GUESS...
a driver for a filesystem...
like ext4 and fat drivers for handling our other storage..
a new filesystem for us to tweak the crap out of and use..?
though ive been wrong before. that is only a logical conclusion not a factual statement
Click to expand...
Click to collapse
Sounds good to me.
Sent from my GT-I9000 using XDA Premium App

TRusselo said:
google :
j4fs...
its a filesystem.... FACT
So my GUESS...
a driver for a filesystem...
like ext4 and fat drivers for handling our other storage..
a new filesystem for us to tweak the crap out of and use..?
though ive been wrong before. that is only a logical conclusion not a factual statement
Click to expand...
Click to collapse
according to the post above you this may be the file system used for the bootloaders on the sgs2 so it would help those folks when hacking.

J4FS porting released
If someone is still interested I've just finished the porting of the J4FS on 3.1.x kernel adding support for normal "block device" (for loopback image mounting).
movitool.ntd.homelinux.org/trac/movitool/wiki/j4fs
Hope this can help...
Ceers
Nitro

And another tool (standalone) to extract j4fs/lfs images (eg. param.lfs).
Note: it only extracts - if you want to modify an image you'll have to use the kernel module from the post above (or a hexeditor and some cleverness).
https://github.com/ius/j4fs_extract
(for Googleability)

whiteguypl said:
http://romkitchen.org/sgs/?s=home
Someone care to explain the benefits, if any, of this? My understanding from what little i read is it will help with kernal development on a decent number of samsung devices.
Edit: as in should i be "super excited", "meh", or "cool beans".
Click to expand...
Click to collapse
dunno for what the driver/partition is used, had troubles (device freeze) with custom kernel an the original module from my GT-I9100 (ICS)
as note: device boots and working without the j4fs module in initramfs...
just for fun a little patch for kernel 3.0.15, just read operation tested.
Code:
Index: jv/llid_kernel.c
===================================================================
--- jv/llid_kernel.c (Revision 2075)
+++ jv/llid_kernel.c (Arbeitskopie)
@@ -95,7 +95,7 @@
set_fs(oldfs);
j4fs_filp->f_flags &= ~O_NONBLOCK;
if (ret < 0) {
- printk(1, "j4fs_filp->read() failed: %d\n", ret);
+ printk(KERN_WARNING "j4fs_filp->read() failed: %d\n", ret);
return J4FS_FAIL;
}
// J4FS for moviNAND merged from ROSSI
@@ -153,7 +153,7 @@
set_fs(oldfs);
j4fs_filp->f_flags &= ~O_NONBLOCK;
if (ret < 0) {
- printk(1, "j4fs_filp->write() failed: %d\n", ret);
+ printk(KERN_WARNING "j4fs_filp->write() failed: %d\n", ret);
return J4FS_FAIL;
}
// J4FS for moviNAND merged from ROSSI
Index: jv/j4fs_kernel.c
===================================================================
--- jv/j4fs_kernel.c (Revision 2075)
+++ jv/j4fs_kernel.c (Arbeitskopie)
@@ -10,7 +10,9 @@
* 2009.03 - Currently managed by SungHwan.yun <[email protected]> @[email protected]
*
*/
-#include <linux/smp_lock.h>
+#include <linux/kernel.h>
+#include <linux/mm.h>
+#include <linux/smp.h>
#include <linux/time.h>
#include <linux/highuid.h>
#include <linux/pagemap.h>
@@ -53,6 +55,8 @@
#define Page_Uptodate(page) test_bit(PG_uptodate, &(page)->flags)
+#define init_MUTEX(sema) sema_init(sema,1)
+
extern j4fs_device_info device_info;
extern unsigned int j4fs_traceMask;
extern unsigned int j4fs_rw_start;
@@ -234,7 +238,7 @@
T(J4FS_TRACE_FS, ("start j4fs_write_begin\n"));
if(to>PAGE_CACHE_SIZE) {
- T(J4FS_TRACE_ALWAYS,("%s %d: page size overflow(pos,index,offset,len,to)=(%d,%d,%d,%d,%d)\n",__FUNCTION__,__LINE__,pos,index,offset,len,to));
+ T(J4FS_TRACE_ALWAYS,("%s %d: page size overflow(pos,index,offset,len,to)=(%llu,%lu,%d,%d,%d)\n",__FUNCTION__,__LINE__,pos,index,offset,len,to));
j4fs_panic("page size overflow");
return -ENOSPC;
}
@@ -1221,7 +1225,7 @@
struct j4fs_sb_info * sbi;
struct j4fs_super_block * es;
struct inode *root;
- u32 tmp, len,ret;
+ u32 ret;
T(J4FS_TRACE_FS,("%s %d\n",__FUNCTION__,__LINE__));
@@ -1322,11 +1326,11 @@
}
-int j4fs_get_sb(struct file_system_type *fs_type, int flags, const char *dev_name, void *data, struct vfsmount *mnt)
+static struct dentry *j4fs_mount(struct file_system_type *fs_type, int flags, const char *dev_name, void *data)
{
T(J4FS_TRACE_FS,("%s %d\n",__FUNCTION__,__LINE__));
- return get_sb_bdev(fs_type, flags, dev_name, data, j4fs_fill_super, mnt);
+ return mount_bdev(fs_type, flags, dev_name, data, j4fs_fill_super);
}
struct kmem_cache * j4fs_inode_cachep;
@@ -1386,7 +1390,7 @@
struct file_system_type j4fs_fs_type = {
.owner = THIS_MODULE,
.name = "j4fs",
- .get_sb = j4fs_get_sb,
+ .mount = j4fs_mount,
.kill_sb = kill_block_super,
.fs_flags = FS_REQUIRES_DEV,
};
@@ -1416,9 +1420,16 @@
return -EINVAL;
}
-int j4fs_fsync(struct file *file, struct dentry *dentry, int datasync)
+static int j4fs_fsync(struct file *file, int datasync)
{
- return 0;
+ int rc = 0;
+
+ rc = generic_file_fsync(file, datasync);
+ if (rc)
+ goto out;
+ rc = vfs_fsync(file, datasync);
+out:
+ return rc;
}
int __init init_j4fs_fs(void)
Index: jv/j4fs.h
===================================================================
--- jv/j4fs.h (Revision 2075)
+++ jv/j4fs.h (Arbeitskopie)
@@ -167,6 +167,7 @@
#define J4FS_RECLAIM_RESET_UNUSED_SPACE
#define J4FS_TRANSACTION_LOGGING
+#undef T
#define T(mask, p) do { if ((mask) & (j4fs_traceMask | J4FS_TRACE_ALWAYS)) TOUT(p); } while (0)
#define POR(mask, p, q) do { if (((mask) & (j4fs_PORMask))&&!(--j4fs_PORCount)) {TOUT(p); while(1); }} while (0)
Index: jv/Makefile
===================================================================
--- jv/Makefile (Revision 2075)
+++ jv/Makefile (Arbeitskopie)
@@ -1,31 +1,5 @@
-##############################################################################
-# COPYRIGHT(C) : Samsung Electronics Co.Ltd, 2006-2011 ALL RIGHTS RESERVED
-# 2009.02 - Currently managed by JongMinKim <[email protected]> , SungHwanYun <[email protected]>
-##############################################################################
-# VERSION&DATE : Version 1.00 2009/02
-##############################################################################
+EXTRA_CFLAGS += -Wframe-larger-than=2048 -Wno-error=declaration-after-statement
-MOD_NAME = j4fs
+obj-$(CONFIG_J4FS) += j4fs.o
-ifneq ($(KERNELRELEASE), )
-
-EXTRA_CFLAGS += -I$(PRJROOT)/modules/include -I$(KDIR)/drivers/tfsr/Inc -I$(KDIR)/include -I$(KDIR)/include/linux -I$(KDIR)/include/asm -D__KERNEL
-
-obj-m := $(MOD_NAME).o
-
-$(MOD_NAME)-y := j4fs_kernel.o llid_kernel.o fsd_common.o
-
-else
-
-all:
- @$(MAKE) -C $(KDIR) \
- SUBDIRS=$(CURDIR) modules
-
-clean:
- rm -f *.o *.ko *.mod.c *~ .*.cmd
-
-install:
- @$(MAKE) --no-print-directory -C $(KDIR) \
- SUBDIRS=$(CURDIR) modules_install
-
-endif
+j4fs-objs := j4fs_kernel.o llid_kernel.o fsd_common.o

[REF] The All In One Guide for SGSA

There isn't really a wholesome guide for this device, which includes everything form flashing to compiling. So i am writing this guide.
Currently its being populated. This will contain everything - flashing, modding, compiling etc.
How to root SGSA : Look here
How to flash firmwares from sammobile using Odin : Look here

Rooting JB :
Download here : Root
How to :
1. Download the zip and place it in the root of your sd card.
PS : SD Card is a must.
2. Reboot to the stock recovery.
3. Select install update from external storage.
4. Select the root.zip file.
5. Viola
Enjoy your rooted JB.
Original post here.
Rooting GB :
Please note that this method will increase the binary counter. A more complex method to root GB is available here which doesn't increase the binary counter.
This kernel will provide you the standard stock kernel and also includes TWRP recovery.
( disclaimer )
I AM NOT TO BE HELD RESPONSIBLE IF YOU DAMAGE YOUR PHONE
Using Odin to flash this kernel WILL increase your binary counter.
----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
( features )
- Team Win Recovery Project 2.2.1
- CIFS Support
----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
( how to install using Odin )
1. Restart into download mode by pressing Power + Home + Vol Down
2. Start Odin, and flash the attached kernel as PDA.
Remember to extract the attached file only once. if you end up with a kernel.bin.md5 you extracted twice!
Do not use the PIT, do not have any options checked except for "Auto reboot" and "F. Reset Time"
3. Wait for the device to reboot
( how to install using DD )
This method does not increase your binary counter, but your phone needs to be rooted so you can perform this!
IF YOU'RE NOT FAMILIAR WITH DD I RECOMMEND YOU TO AVOID THIS METHOD
1. Extract the attached file twice. You will end up with a kernel.bin.md5 file
2. Put the kernel.bin.md5 file to /sdcard
3. Start adb shell
4. Do the following commands:
Code:
$ su
# dd if=/sdcard/kernel.bin.md5 of=/dev/block/mmcblk0p15
# reboot
5. Wait for the device to reboot.
Click to expand...
Click to collapse
Download the pre-rooted kernel here.

Flashing with Odin :
Odin is the saviour tool for all Samsung devices. The method for flashing by Odin differs from device to device.
This thread will give step by step instructions on how to flash a stock rom from Odin on the GT-I9070/p :
A. Download Odin tools from here : Odin Tools
Pass : shaaan
B. Download the stock rom from : SamFirmware
Setting up Odin :
1. Make sure you have installed the necessary drivers for this device. The drivers can be installed from within KIES or seperately here.
2. Run Odin as administrator.
3. Setting up the files is divided in two types depending on the firmware type :
a. If the firmware is a multi package file, put the files in the corresponding sections.
ie. CSC file in CSC section, PDA file in PDA section.
b. If the firmware is a single package, add the single file in the PDA section.
{
"lightbox_close": "Close",
"lightbox_next": "Next",
"lightbox_previous": "Previous",
"lightbox_error": "The requested content cannot be loaded. Please try again later.",
"lightbox_start_slideshow": "Start slideshow",
"lightbox_stop_slideshow": "Stop slideshow",
"lightbox_full_screen": "Full screen",
"lightbox_thumbnails": "Thumbnails",
"lightbox_download": "Download",
"lightbox_share": "Share",
"lightbox_zoom": "Zoom",
"lightbox_new_window": "New window",
"lightbox_toggle_sidebar": "Toggle sidebar"
}
4. Now that Odin is setup, put the phone in download mode. To do that, power off the phone and press 'home+power+volume down' buttons together. Keep the buttons pressed till Download mode appears.
5. Now that Odin and the phone are setup, connect the phone to the device. Odin will detect the device and show something like 'com port (1)'
6. Flash the device.
7. The flash will take 5 minutes for a full flash on average.
8. When the flashing is complete, DO NOT remove the device until Odin shows ' PASS '.
9. The device will reboot. Remove the device, go to recovery mode and do a factory/data reset.
That's it. Happy flashing peeps..!!

ROM Modding
Now that we are done with basic things like rooting and flashing, let's move on to some complex stuff..
Tools needed -
1. Apktool
2. XUltimate for deodexing
3. Notepad ++
4. Baksmali manager ( attached )
5. DSIXDA's Android kitchen - only if you really want to use it. but i recommend doing everything manually.
Click to expand...
Click to collapse
Step I :
Setup Android SDK. Instructions here.
Once the SDK is setup, run the command "android" in command prompt. It should look something like this.
Make sure that your PC recognizes the device. Run the command "adb devices". It should show something like this.
Step II :
Once these basic things are setup, install apktool :
1. Download apktool.
2. There will be two files, they will be .bz2 files.
3. Create a new folder called apktool.
4. Put it here: C:\Users\<your username>\apktool.
5. Open these with 7zip. You’ll notice that inside there are .tar files.
6. Double-click the .tar file, and now you’ll see the files.
7. Extract the files from BOTH zips to your new apktool folder at C:\Users\<your username>\apktool.
8. You’ll have 3 files total now in your apktool folder: aapt.exe, apktool.bat, apktool.jar.
Click to expand...
Click to collapse
Now install Notepad++
Restart the computer.
Using apktool :
Generally it is not required to install the framework files, but apps like '/system/app/Settings.apk' need it.
The general commands for apktool are -
apktool d framework-res.apk -- Decompiles framework-res.apk
apktool b framework-res -- Builds the modified files
apktool if path_to_framework-res.apk -- Installs framework-res. Do the same for twframework-res
Click to expand...
Click to collapse

Preface :
OK a lot of people have been asking about building kernels, so here is my best shot at a tutorial. You guys shouldn't expect my little walk through here plus another person’s source to make you a "developer", all it will prove is that you can copy/paste. Also if you follow this guide, I am not responsible for anything that you may do that results in destruction, death, or other negative side-affects. You really shouldn't be messing with this stuff unless you know what you are doing, or doing a LOT of research along the way.
However please use this guide as a springboard for knowledge, to give you some key terms to google, to turn on those lightbulbs in your head and get those gears churning.
Note: This is not a newbie's guide to Linux. Before you post your question please look at it. If it involves the syntax of the command/what a command does you need to do your own research elsewhere before attempting to continue with this guide.
Click to expand...
Click to collapse
I. Setting up the environment :
A. Install Ubuntu 12.04 (Not holding your hand here, if you can't do this you shouldn't be messing with kernels)
B. Installing required packages: Type this code into the terminal.
Code:
For 32 and 64 bit systems :
sudo apt-get install git-core gnupg flex bison gperf libsdl1.2-dev libesd0-dev libwxgtk2.8-dev squashfs-tools build-essential zip curl
libncurses5-dev zlib1g-dev openjdk-6-jre openjdk-6-jdk pngcrush schedtool
For 64 bit systems only :
g++-multilib lib32z1-dev lib32ncurses5-dev lib32readline-gplv2-dev gcc-4.7-multilib g++-4.5-multilib
Also make sure you have ADB installed. Its a must.
C. Open a terminal
D. Type "mkdir -p android/kernel"
The above steps explained:
A. Installing a linux distro. You could really install any Linux distro however Ubuntu in my eyes is the easy to use and install, and widely supported.
B. Installing needed packages. These are needed for building the kernel. No I can't tell you what every single package does, it is your job to research and figure that out.
C. Ummm...duh?
D. Building a directory structure that will help keep us organized. The "mkdir" command creates a directory. The more you type these commands the more familiar you will become with them.
Click to expand...
Click to collapse
II. Downloading the source :
A. Download the relevant source from the Samsung Opensource Website
B. Once the source is download, extract it into the "android/kernel" directory that we made in the previous step.
C. Grab your desired toolchain. I generally recommend the CodeSourcery toolchain.
Click to expand...
Click to collapse
III. Modifications :
This is the part people are curious about, they want to make modifications to the kernel to make it "special". Start all these from the root directory of your kernel source.
Mod 1. Applying a patch
A. Download the patch you wish to apply, in this case this one should work.
B. Save that file as "kernelPatch" in your kernel directory.
C. Open a Terminal
D. Move into the root directory of the kernel you wish to patch.
E. Type "patch -p1 < ../kernelPatch"
The above steps explained:
A. Pretty simple, I mean we need a patch. The patch itself is quite simply a diff between the original kernel source tree and the source tree containing the changes. I'll post a quick tutorial on how to create a patch in the third post. The patch above contains multiple governors to be added to your kernel.
B. Self-explanatory
C. Self-explanatory
D. Self-explanatory
E. Basically we run the patch command on our source using the patch we downloaded previously. The "patch" portion is the binary itself, the "-p1" option allows you to control the number of forward slashes to remove from file paths(You'll need to look at this option more if you are using weird directory structures or applying the patches from a odd location). The "<" operator directs the content of our "../kernelPatch" file into the command.
Click to expand...
Click to collapse
Mod 2. Adding a Governor
A. Open "drivers/cpufreq/Kconfig"
B. Add the following lines in appropriate spot amongst the other govenor's
Code:
config CPU_FREQ_DEFAULT_GOV_SMARTASS
bool "smartass"
select CPU_FREQ_GOV_SMARTASS
select CPU_FREQ_GOV_PERFORMANCE
help
Use the CPUFreq governor 'smartass' as default.
Code:
config CPU_FREQ_GOV_SMARTASS
tristate "'smartass' cpufreq governor"
depends on CPU_FREQ
help
smartass' - a "smart" optimized governor!
If in doubt, say N.
C. Open "drivers/cpufreq/Makefile"
D. Add the following line in the appropriate spot.
Code:
obj-$(CONFIG_CPU_FREQ_GOV_SMARTASS) += cpufreq_smartass.o
E. Create a file called "drivers/cpufreq/cpufreq_smartass.c"
F. Put the following code in that file.
Code:
/*
* drivers/cpufreq/cpufreq_smartass.c
*
* Copyright (C) 2010 Google, Inc.
*
* This software is licensed under the terms of the GNU General Public
* License version 2, as published by the Free Software Foundation, and
* may be copied, distributed, and modified under those terms.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* Author: Erasmux
*
* Based on the interactive governor By Mike Chan ([email protected])
* which was adaptated to 2.6.29 kernel by Nadlabak ([email protected])
*
* requires to add
* EXPORT_SYMBOL_GPL(nr_running);
* at the end of kernel/sched.c
*
*/
#include <linux/cpu.h>
#include <linux/cpumask.h>
#include <linux/cpufreq.h>
#include <linux/sched.h>
#include <linux/tick.h>
#include <linux/timer.h>
#include <linux/workqueue.h>
#include <linux/moduleparam.h>
#include <asm/cputime.h>
#include <linux/earlysuspend.h>
static void (*pm_idle_old)(void);
static atomic_t active_count = ATOMIC_INIT(0);
struct smartass_info_s {
struct cpufreq_policy *cur_policy;
struct timer_list timer;
u64 time_in_idle;
u64 idle_exit_time;
unsigned int force_ramp_up;
unsigned int enable;
};
static DEFINE_PER_CPU(struct smartass_info_s, smartass_info);
/* Workqueues handle frequency scaling */
static struct workqueue_struct *up_wq;
static struct workqueue_struct *down_wq;
static struct work_struct freq_scale_work;
static u64 freq_change_time;
static u64 freq_change_time_in_idle;
static cpumask_t work_cpumask;
static unsigned int suspended;
/*
* The minimum amount of time to spend at a frequency before we can ramp down,
* default is 45ms.
*/
#define DEFAULT_DOWN_RATE_US 20000
static unsigned long down_rate_us;
/*
* When ramping up frequency with no idle cycles jump to at least this frequency.
* Zero disables. Set a very high value to jump to policy max freqeuncy.
*/
#define DEFAULT_UP_MIN_FREQ 1152000
static unsigned int up_min_freq;
/*
* When sleep_max_freq>0 the frequency when suspended will be capped
* by this frequency. Also will wake up at max frequency of policy
* to minimize wakeup issues.
* Set sleep_max_freq=0 to disable this behavior.
*/
#define DEFAULT_SLEEP_MAX_FREQ 537600
static unsigned int sleep_max_freq;
/*
* Sampling rate, I highly recommend to leave it at 2.
*/
#define DEFAULT_SAMPLE_RATE_JIFFIES 2
static unsigned int sample_rate_jiffies;
/*
* Freqeuncy delta when ramping up.
* zero disables causes to always jump straight to max frequency.
*/
#define DEFAULT_RAMP_UP_STEP 614400
static unsigned int ramp_up_step;
/*
* Max freqeuncy delta when ramping down. zero disables.
*/
#define DEFAULT_MAX_RAMP_DOWN 384000
static unsigned int max_ramp_down;
/*
* CPU freq will be increased if measured load > max_cpu_load;
*/
#define DEFAULT_MAX_CPU_LOAD 75
static unsigned long max_cpu_load;
/*
* CPU freq will be decreased if measured load < min_cpu_load;
*/
#define DEFAULT_MIN_CPU_LOAD 30
static unsigned long min_cpu_load;
static int cpufreq_governor_smartass(struct cpufreq_policy *policy,
unsigned int event);
#ifndef CONFIG_CPU_FREQ_DEFAULT_GOV_SMARTASS
static
#endif
struct cpufreq_governor cpufreq_gov_smartass = {
.name = "smartass",
.governor = cpufreq_governor_smartass,
.max_transition_latency = 6000000,
.owner = THIS_MODULE,
};
static void cpufreq_smartass_timer(unsigned long data)
{
u64 delta_idle;
u64 update_time;
u64 now_idle;
struct smartass_info_s *this_smartass = &per_cpu(smartass_info, data);
struct cpufreq_policy *policy = this_smartass->cur_policy;
now_idle = get_cpu_idle_time_us(data, &update_time);
if (update_time == this_smartass->idle_exit_time)
return;
delta_idle = cputime64_sub(now_idle, this_smartass->time_in_idle);
//printk(KERN_INFO "smartass: t=%llu i=%llu\n",cputime64_sub(update_time,this_smartass->idle_exit_time),delta_idle);
/* Scale up if there were no idle cycles since coming out of idle */
if (delta_idle == 0) {
if (policy->cur == policy->max)
return;
if (nr_running() < 1)
return;
this_smartass->force_ramp_up = 1;
cpumask_set_cpu(data, &work_cpumask);
queue_work(up_wq, &freq_scale_work);
return;
}
/*
* There is a window where if the cpu utlization can go from low to high
* between the timer expiring, delta_idle will be > 0 and the cpu will
* be 100% busy, preventing idle from running, and this timer from
* firing. So setup another timer to fire to check cpu utlization.
* Do not setup the timer if there is no scheduled work.
*/
if (!timer_pending(&this_smartass->timer) && nr_running() > 0) {
this_smartass->time_in_idle = get_cpu_idle_time_us(
data, &this_smartass->idle_exit_time);
mod_timer(&this_smartass->timer, jiffies + sample_rate_jiffies);
}
if (policy->cur == policy->min)
return;
/*
* Do not scale down unless we have been at this frequency for the
* minimum sample time.
*/
if (cputime64_sub(update_time, freq_change_time) < down_rate_us)
return;
cpumask_set_cpu(data, &work_cpumask);
queue_work(down_wq, &freq_scale_work);
}
static void cpufreq_idle(void)
{
struct smartass_info_s *this_smartass = &per_cpu(smartass_info, smp_processor_id());
struct cpufreq_policy *policy = this_smartass->cur_policy;
pm_idle_old();
if (!cpumask_test_cpu(smp_processor_id(), policy->cpus))
return;
/* Timer to fire in 1-2 ticks, jiffie aligned. */
if (timer_pending(&this_smartass->timer) == 0) {
this_smartass->time_in_idle = get_cpu_idle_time_us(
smp_processor_id(), &this_smartass->idle_exit_time);
mod_timer(&this_smartass->timer, jiffies + sample_rate_jiffies);
}
}
/*
* Choose the cpu frequency based off the load. For now choose the minimum
* frequency that will satisfy the load, which is not always the lower power.
*/
static unsigned int cpufreq_smartass_calc_freq(unsigned int cpu, struct cpufreq_policy *policy)
{
unsigned int delta_time;
unsigned int idle_time;
unsigned int cpu_load;
unsigned int new_freq;
u64 current_wall_time;
u64 current_idle_time;
current_idle_time = get_cpu_idle_time_us(cpu, &current_wall_time);
idle_time = (unsigned int)( current_idle_time - freq_change_time_in_idle );
delta_time = (unsigned int)( current_wall_time - freq_change_time );
cpu_load = 100 * (delta_time - idle_time) / delta_time;
//printk(KERN_INFO "Smartass calc_freq: delta_time=%u cpu_load=%u\n",delta_time,cpu_load);
if (cpu_load < min_cpu_load) {
cpu_load += 100 - max_cpu_load; // dummy load.
new_freq = policy->cur * cpu_load / 100;
if (max_ramp_down && new_freq < policy->cur - max_ramp_down)
new_freq = policy->cur - max_ramp_down;
//printk(KERN_INFO "Smartass calc_freq: %u => %u\n",policy->cur,new_freq);
return new_freq;
} if (cpu_load > max_cpu_load) {
if (ramp_up_step)
new_freq = policy->cur + ramp_up_step;
else
new_freq = policy->max;
return new_freq;
}
return policy->cur;
}
/* We use the same work function to sale up and down */
static void cpufreq_smartass_freq_change_time_work(struct work_struct *work)
{
unsigned int cpu;
unsigned int new_freq;
struct smartass_info_s *this_smartass;
struct cpufreq_policy *policy;
cpumask_t tmp_mask = work_cpumask;
for_each_cpu(cpu, tmp_mask) {
this_smartass = &per_cpu(smartass_info, cpu);
policy = this_smartass->cur_policy;
if (this_smartass->force_ramp_up) {
this_smartass->force_ramp_up = 0;
if (nr_running() == 1) {
cpumask_clear_cpu(cpu, &work_cpumask);
return;
}
if (policy->cur == policy->max)
return;
if (ramp_up_step)
new_freq = policy->cur + ramp_up_step;
else
new_freq = policy->max;
if (suspended && sleep_max_freq) {
if (new_freq > sleep_max_freq)
new_freq = sleep_max_freq;
} else {
if (new_freq < up_min_freq)
new_freq = up_min_freq;
}
} else {
new_freq = cpufreq_smartass_calc_freq(cpu,policy);
// in suspend limit to sleep_max_freq and
// jump straight to sleep_max_freq to avoid wakeup problems
if (suspended && sleep_max_freq &&
(new_freq > sleep_max_freq || new_freq > policy->cur))
new_freq = sleep_max_freq;
}
if (new_freq > policy->max)
new_freq = policy->max;
if (new_freq < policy->min)
new_freq = policy->min;
__cpufreq_driver_target(policy, new_freq,
CPUFREQ_RELATION_L);
freq_change_time_in_idle = get_cpu_idle_time_us(cpu,
&freq_change_time);
cpumask_clear_cpu(cpu, &work_cpumask);
}
}
static ssize_t show_down_rate_us(struct cpufreq_policy *policy, char *buf)
{
return sprintf(buf, "%lu\n", down_rate_us);
}
static ssize_t store_down_rate_us(struct cpufreq_policy *policy, const char *buf, size_t count)
{
ssize_t res;
unsigned long input;
res = strict_strtoul(buf, 0, &input);
if (res >= 0 && input >= 1000 && input <= 100000000)
down_rate_us = input;
return res;
}
static struct freq_attr down_rate_us_attr = __ATTR(down_rate_us, 0644,
show_down_rate_us, store_down_rate_us);
static ssize_t show_up_min_freq(struct cpufreq_policy *policy, char *buf)
{
return sprintf(buf, "%u\n", up_min_freq);
}
static ssize_t store_up_min_freq(struct cpufreq_policy *policy, const char *buf, size_t count)
{
ssize_t res;
unsigned long input;
res = strict_strtoul(buf, 0, &input);
if (res >= 0 && input >= 0)
up_min_freq = input;
return res;
}
static struct freq_attr up_min_freq_attr = __ATTR(up_min_freq, 0644,
show_up_min_freq, store_up_min_freq);
static ssize_t show_sleep_max_freq(struct cpufreq_policy *policy, char *buf)
{
return sprintf(buf, "%u\n", sleep_max_freq);
}
static ssize_t store_sleep_max_freq(struct cpufreq_policy *policy, const char *buf, size_t count)
{
ssize_t res;
unsigned long input;
res = strict_strtoul(buf, 0, &input);
if (res >= 0 && input >= 0)
sleep_max_freq = input;
return res;
}
static struct freq_attr sleep_max_freq_attr = __ATTR(sleep_max_freq, 0644,
show_sleep_max_freq, store_sleep_max_freq);
static ssize_t show_sample_rate_jiffies(struct cpufreq_policy *policy, char *buf)
{
return sprintf(buf, "%u\n", sample_rate_jiffies);
}
static ssize_t store_sample_rate_jiffies(struct cpufreq_policy *policy, const char *buf, size_t count)
{
ssize_t res;
unsigned long input;
res = strict_strtoul(buf, 0, &input);
if (res >= 0 && input > 0 && input <= 1000)
sample_rate_jiffies = input;
return res;
}
static struct freq_attr sample_rate_jiffies_attr = __ATTR(sample_rate_jiffies, 0644,
show_sample_rate_jiffies, store_sample_rate_jiffies);
static ssize_t show_ramp_up_step(struct cpufreq_policy *policy, char *buf)
{
return sprintf(buf, "%u\n", ramp_up_step);
}
static ssize_t store_ramp_up_step(struct cpufreq_policy *policy, const char *buf, size_t count)
{
ssize_t res;
unsigned long input;
res = strict_strtoul(buf, 0, &input);
if (res >= 0)
ramp_up_step = input;
return res;
}
static struct freq_attr ramp_up_step_attr = __ATTR(ramp_up_step, 0644,
show_ramp_up_step, store_ramp_up_step);
static ssize_t show_max_ramp_down(struct cpufreq_policy *policy, char *buf)
{
return sprintf(buf, "%u\n", max_ramp_down);
}
static ssize_t store_max_ramp_down(struct cpufreq_policy *policy, const char *buf, size_t count)
{
ssize_t res;
unsigned long input;
res = strict_strtoul(buf, 0, &input);
if (res >= 0)
max_ramp_down = input;
return res;
}
static struct freq_attr max_ramp_down_attr = __ATTR(max_ramp_down, 0644,
show_max_ramp_down, store_max_ramp_down);
static ssize_t show_max_cpu_load(struct cpufreq_policy *policy, char *buf)
{
return sprintf(buf, "%lu\n", max_cpu_load);
}
static ssize_t store_max_cpu_load(struct cpufreq_policy *policy, const char *buf, size_t count)
{
ssize_t res;
unsigned long input;
res = strict_strtoul(buf, 0, &input);
if (res >= 0 && input > 0 && input <= 100)
max_cpu_load = input;
return res;
}
static struct freq_attr max_cpu_load_attr = __ATTR(max_cpu_load, 0644,
show_max_cpu_load, store_max_cpu_load);
static ssize_t show_min_cpu_load(struct cpufreq_policy *policy, char *buf)
{
return sprintf(buf, "%lu\n", min_cpu_load);
}
static ssize_t store_min_cpu_load(struct cpufreq_policy *policy, const char *buf, size_t count)
{
ssize_t res;
unsigned long input;
res = strict_strtoul(buf, 0, &input);
if (res >= 0 && input > 0 && input < 100)
min_cpu_load = input;
return res;
}
static struct freq_attr min_cpu_load_attr = __ATTR(min_cpu_load, 0644,
show_min_cpu_load, store_min_cpu_load);
static struct attribute * smartass_attributes[] = {
&down_rate_us_attr.attr,
&up_min_freq_attr.attr,
&sleep_max_freq_attr.attr,
&sample_rate_jiffies_attr.attr,
&ramp_up_step_attr.attr,
&max_ramp_down_attr.attr,
&max_cpu_load_attr.attr,
&min_cpu_load_attr.attr,
NULL,
};
static struct attribute_group smartass_attr_group = {
.attrs = smartass_attributes,
.name = "smartass",
};
static int cpufreq_governor_smartass(struct cpufreq_policy *new_policy,
unsigned int event)
{
unsigned int cpu = new_policy->cpu;
int rc;
struct smartass_info_s *this_smartass = &per_cpu(smartass_info, cpu);
switch (event) {
case CPUFREQ_GOV_START:
if ((!cpu_online(cpu)) || (!new_policy->cur))
return -EINVAL;
if (this_smartass->enable) /* Already enabled */
break;
/*
* Do not register the idle hook and create sysfs
* entries if we have already done so.
*/
if (atomic_inc_return(&active_count) > 1)
return 0;
rc = sysfs_create_group(&new_policy->kobj, &smartass_attr_group);
if (rc)
return rc;
pm_idle_old = pm_idle;
pm_idle = cpufreq_idle;
this_smartass->cur_policy = new_policy;
this_smartass->cur_policy->max = CONFIG_MSM_CPU_FREQ_ONDEMAND_MAX;
this_smartass->cur_policy->min = CONFIG_MSM_CPU_FREQ_ONDEMAND_MIN;
this_smartass->cur_policy->cur = CONFIG_MSM_CPU_FREQ_ONDEMAND_MAX;
this_smartass->enable = 1;
// notice no break here!
case CPUFREQ_GOV_LIMITS:
if (this_smartass->cur_policy->cur != new_policy->max)
__cpufreq_driver_target(new_policy, new_policy->max, CPUFREQ_RELATION_H);
break;
case CPUFREQ_GOV_STOP:
this_smartass->enable = 0;
if (atomic_dec_return(&active_count) > 1)
return 0;
sysfs_remove_group(&new_policy->kobj,
&smartass_attr_group);
pm_idle = pm_idle_old;
del_timer(&this_smartass->timer);
break;
}
return 0;
}
static void smartass_suspend(int cpu, int suspend)
{
struct smartass_info_s *this_smartass = &per_cpu(smartass_info, smp_processor_id());
struct cpufreq_policy *policy = this_smartass->cur_policy;
unsigned int new_freq;
if (!this_smartass->enable || sleep_max_freq==0) // disable behavior for sleep_max_freq==0
return;
if (suspend) {
if (policy->cur > sleep_max_freq) {
new_freq = sleep_max_freq;
if (new_freq > policy->max)
new_freq = policy->max;
if (new_freq < policy->min)
new_freq = policy->min;
__cpufreq_driver_target(policy, new_freq,
CPUFREQ_RELATION_H);
}
} else { // resume at max speed:
__cpufreq_driver_target(policy, policy->max,
CPUFREQ_RELATION_H);
}
}
static void smartass_early_suspend(struct early_suspend *handler) {
int i;
suspended = 1;
for_each_online_cpu(i)
smartass_suspend(i,1);
}
static void smartass_late_resume(struct early_suspend *handler) {
int i;
suspended = 0;
for_each_online_cpu(i)
smartass_suspend(i,0);
}
static struct early_suspend smartass_power_suspend = {
.suspend = smartass_early_suspend,
.resume = smartass_late_resume,
};
static int __init cpufreq_smartass_init(void)
{
unsigned int i;
struct smartass_info_s *this_smartass;
down_rate_us = DEFAULT_DOWN_RATE_US;
up_min_freq = DEFAULT_UP_MIN_FREQ;
sleep_max_freq = DEFAULT_SLEEP_MAX_FREQ;
sample_rate_jiffies = DEFAULT_SAMPLE_RATE_JIFFIES;
ramp_up_step = DEFAULT_RAMP_UP_STEP;
max_ramp_down = DEFAULT_MAX_RAMP_DOWN;
max_cpu_load = DEFAULT_MAX_CPU_LOAD;
min_cpu_load = DEFAULT_MIN_CPU_LOAD;
suspended = 0;
/* Initalize per-cpu data: */
for_each_possible_cpu(i) {
this_smartass = &per_cpu(smartass_info, i);
this_smartass->enable = 0;
this_smartass->force_ramp_up = 0;
this_smartass->time_in_idle = 0;
this_smartass->idle_exit_time = 0;
// intialize timer:
init_timer_deferrable(&this_smartass->timer);
this_smartass->timer.function = cpufreq_smartass_timer;
this_smartass->timer.data = i;
}
/* Scale up is high priority */
up_wq = create_rt_workqueue("ksmartass_up");
down_wq = create_workqueue("ksmartass_down");
INIT_WORK(&freq_scale_work, cpufreq_smartass_freq_change_time_work);
register_early_suspend(&smartass_power_suspend);
return cpufreq_register_governor(&cpufreq_gov_smartass);
}
#ifdef CONFIG_CPU_FREQ_DEFAULT_GOV_SMARTASS
pure_initcall(cpufreq_smartass_init);
#else
module_init(cpufreq_smartass_init);
#endif
static void __exit cpufreq_smartass_exit(void)
{
cpufreq_unregister_governor(&cpufreq_gov_smartass);
destroy_workqueue(up_wq);
destroy_workqueue(down_wq);
}
module_exit(cpufreq_smartass_exit);
MODULE_AUTHOR ("Erasmux");
MODULE_DESCRIPTION ("'cpufreq_smartass' - A smart cpufreq governor");
MODULE_LICENSE ("GPL");
G. open "include/linux/cpufreq.h"
H. Under the "Cpufreq Default" section add
Code:
#elif defined(CONFIG_CPU_FREQ_DEFAULT_GOV_SMARTASS)
extern struct cpufreq_governor cpufreq_gov_smartass;
#define CPUFREQ_DEFAULT_GOVERNOR (&cpufreq_gov_smartass)
Ok there is a governor added, do the exact same steps for any other one's you would like to add.
The above steps explained:
A. Just opening a file, you guys have this. The Kconfig ties into our "make menuconfig" command later, making our mod a selectable option.
B. Adding the appropriate code for our governor to get it in our .config file. The first chunk would allow us to set our governor as the default one for our kernel, the other allows us to totally remove or add it to the build as we wish.
C-D. This step tells the linker to tie our module in with the rest of the code.
E-F. Creating the actually governor itself, don't skip this step. I would suggest reading through this and trying to understand how it works, it's some pretty awesome stuff.
G-H. Open a file and add the code needed to tie our module into the rest of the source. Without this we would not be able to compile due to the rest of the source not knowing our module exists.
Click to expand...
Click to collapse
Click to expand...
Click to collapse
IV. Getting a Config File :
Samsung now doesn't support grabbing the kernel config from "/proc/config". So we have the alternative method of using the stock config from "/arch/arm/config". Use the README to get a better understanding of how the config file works.
Click to expand...
Click to collapse
V. Building :
Time to start the real "build" section of this tutorial.
Part A. Pre-build Steps
A. Open terminal and change to the root of your kernel directory
B. Type "export ARCH=arm"
C. Type "export CROSS_COMPILE=~/android/kernel/toolchains/arm-eabi-linaro-4.6.2/bin/arm-eabi-"
Part B. The First Build
A. Type "make <your_config_name>_defconfig"
B. Type "make menuconfig" and make the required changes to use any modules you added or similar changes.
C. Type "make -j<maximum number of jobs>"
Part C. Re-Builds
A. Type "make clean"
B. Type "make oldconfig"
C. Type "make -j<maximum number of jobs>"
Part D. Building Modules
You have two options:
A. Type "make modules"
B. Type "make path/to/your/module.ko"
Alternatively, you can use this build script here[/URL.]
Click to expand...
Click to collapse
Above steps explained :
Part A.(These steps are required every time you close your terminal and re-open it to build again.)
A. Ok shouldn’t need to explain this.
B. This command sets your target architecture.
C. Defines the path to the toolchain we are going to use to compile our kernel. You can change this to point towards whatever toolchain you have downloaded or feel like using, the way it is currently configured it will use the Linaro toolchain that we downloaded above.
Part B.(These only need to be run the first time you build a kernel.)
A. Load's your configuration file from earlier.
B. Open up a menu to configure your kernel. It will use the config file you loaded in the previous step as a base.
C. Viola start the build. I typically allow 1 job per core, so on my quad core machine I put "make -j4". Just raising that number will not make your build faster, your processor needs to be able to support the number of jobs you are assigning it.
Part C. (Use the command's when you are building any-time outside of the first)
A. This command gets rid of any old/outdated binaries or modules you compiled before, and let's start fresh. I like to run it every I build unless my changes are really small and localized.
B. A very awesome command, it parses through what has changed and only prompts you about new options.
C. See the explanation for the above "Part C.".
Part D.(Use these for just building kernel modules.)
A. This will re-build all modules.
B. Will rebuild just the module you need. Very useful when you need to rebuild a WiFi module.
Click to expand...
Click to collapse
Click to expand...
Click to collapse
VI. Now What ?
Ok we have now started our build and we are waiting for it to finish, so there are two possible outcomes:
Outcome A. Build Succeds
W00t!! You have a kernel built by your self from source. There are a couple things you need in-order to use this kernel on your device any ".ko" modules and the zImage binary. If you pay attention to the output of your compiler then you will see the location of those objects. However the following commands will make your life a bit easier(Thanks Recognized Developer Hacre):
A. Open a terminal
B. Change to your root kernel directory
C. Type "mkdir ../<your_kernel>_output"
D. Type "cp arch/arm/boot/zImage ../<your_kernel>_output/zImage"
E. Type "find . -name "*.ko" -exec cp {} ../<your_kernel>_output \;"
The above steps explained:
A-C. Self-Explanatory
D. Move our kernel binary into our output folder
E. This handy bit of magic finds all ".ko" modules and also copies them into your output file.
You will also need to assemble a kernel image containing a initramfs for your device, along with the kernel binary and such. Getting the ramdisk from a bin file isn't really easy, but i have attached a script that should do the work. Just remove the .txt extension and chmod it to a+x.
Click to expand...
Click to collapse
Outcome B : Build Fails
Oh dear. It failed. Well guess what...this is going to happen..a LOT. Get used to it, and get used to googling and experimenting with different solutions. The following are some tips that will help you with debugging your issues.
Running a "Clean" build
A. Backup your config file(Type "cp .config ../backupConfig")
B. Re-run the build process using just your defconfig from earlier.
Limiting Output(Thanks Hacre.)
A. Another good tip is to run "make -j1" to get the error, as it will limit the amount of text you need to scroll through.
Click to expand...
Click to collapse
Click to expand...
Click to collapse
While the kernel is compiling, it should show something like this :
When the kernel compile is complete, it should show something like this :
Tips :
I. In the defconfig file, remove the SHRM file signature verification or RIL won't work.
II. Use "make menuconfig" to access a GUI and modify the kernel parameters.

FAQ's :
Q. Can i downgrade the device if i upgrade it to JB ?
A. Yes. You can. There is a detailed guide in the development section. Please refer it before posting.
Credits :
thewadegeek form whose kernel compiling guide, i copy pasted loads of stuff
users for their support
Click to expand...
Click to collapse
Feel something is missing ? Please let me know. I will be happy to update the guide.

Good job dude , keep up u r doing great , thanks lot ^_*

Can I flash whole XXLPZ via odin the same way? Coz my ota doesn't show any update.
And will the root method work then too?
Sent from my GT-I9070 using xda premium

atishey23 said:
Can I flash whole XXLPZ via odin the same way? Coz my ota doesn't show any update.
And will the root method work then too?
Sent from my GT-I9070 using xda premium
Click to expand...
Click to collapse
yes and yes. worked for me, improved performance for me

i think they should pin this thread

popup error
after i flash xxlpz via odin it reboots perfectly and stuck at language chooser. cant finish setup because of popup error "unfortunately com.google.process has stopped" any fix?

Одг: [REF] The All In One Guide for SGSA
ianmcgui said:
after i flash xxlpz via odin it reboots perfectly and stuck at language chooser. cant finish setup because of popup error "unfortunately com.google.process has stopped" any fix?
Click to expand...
Click to collapse
Read a bit!
http://forum.xda-developers.com/showthread.php?p=37246645
Sent from Galaxy S Advance

thanks...good going
thanks, waiting for more :good:

OP updated.

perfect guide
gr8 work.................. i wish i could find this type of guide before i root 1st time so that my binary count wont increase
btw there is any other way for zero binary count??? (i know about triangle away & jib and try both on my sgsa but dont work
and i have 1 problem if u have sol. than plz reply.. in my sgsa "wap setting" can not be installed which is sent by service providers (i.e bsnllive , docomo divein etc) it gives me unable to read
any one having this type of problem???/

great guide..btw i have a problem.. i have installed everything and when i perform a task the terminal want the password which i cant seem to be able to input! i cant do anything because of that! any workaround?

Brainiac.shri said:
great guide..btw i have a problem.. i have installed everything and when i perform a task the terminal want the password which i cant seem to be able to input! i cant do anything because of that! any workaround?
Click to expand...
Click to collapse
Since you don't state it clearly, i guess that you are talking about the commands in Ubuntu!
When you enter the password in the Ubuntu terminal, it isn't showed for security reasons.
So, just type the password and press enter!
Sent from my GT-I9070 using xda premium

Shaaan said:
Since you don't state it clearly, i guess that you are talking about the commands in Ubuntu!
When you enter the password in the Ubuntu terminal, it isn't showed for security reasons.
So, just type the password and press enter!
Sent from my GT-I9070 using xda premium
Click to expand...
Click to collapse
nope! doesnt work! but still logged into ubuntu and tried again and still not working. i remember the password(i just used it to log into the OS) just do not see the problem!
EDIT: doesnt work for certain commands! i tried rooting it just for fun and there the password was accepted just fine!

Frankly speaking after spending a lot of time on XDA, I feel like Developing something for our dear phone! So like which is easier, safer and/or quicker to develop.. A Kernel or a Custom ROM..?
If Kernel.. how can I do that? Download stock kernel and modify it?
If ROM.. where to start? Download the firmware and start modifying it?
PS: I'm not trolling... I'm serious

Sami Kabir said:
Frankly speaking after spending a lot of time on XDA, I feel like Developing something for our dear phone! So like which is easier, safer and/or quicker to develop.. A Kernel or a Custom ROM..?
If Kernel.. how can I do that? Download stock kernel and modify it?
If ROM.. where to start? Download the firmware and start modifying it?
PS: I'm not trolling... I'm serious
Click to expand...
Click to collapse
Step by step ROM making guide. Heat up your PC chair by reading!!! But, as I know you - you will ask for explanation.
http://forum.xda-developers.com/showthread.php?t=1801690

[Q] Compiling gcc and toolchain for use ON android device

Hello all. I have built the android-ndk-r9d toolchain on my Ubuntu machine, and it will compile a few things like nmap and perl just fine with some tweaking (I forgot the links but there are projects that give the options to use when compiling these). But I haven't seen any successful compilations of more recent versions of gcc with bionic.
I did some digging around in spartacus' terminal-ide project, the point of which is to have java, vim, gcc for use on the device itself, I found that gcc was version 4.4.0. I have tried to reach him via email to see what ./configure settings he used, but to no response.
Has anyone else attempted this, to build android gcc in versions more recent than 4.4.0 for compiling software on the device? What configure settings have you tried, and how much have you modified the gcc source code itself? Or is everyone content to build other projects using their regular Linux box?
My device in question is a nexus 5, which has more than enough CPU power to do this, to quell any concerns people will have to that end.

Well, I had a day free yesterday and tried everything again, and I believe I hit the same stopping point error after correcting several others. Only this time, I made an actual script and patchfiles to handle everything to make this more organized. Again has anyone attempted to do this?
First, the script.
Code:
#!/bin/bash
HOME_DIR=/home/jmanley
GCC_BUILD_DIR=$HOME_DIR/gcc-android-build
HOST=arm-linux-androideabi
CFLAGS='-Wall -O -mandroid -mbionic'
LIBCFLAGS='-O2 -mandroid -mbionic'
LIBCPPFLAGS='-O2 -mandroid -mbionic'
LIBCXXFLAGS='-O2 -mandroid -mbionic -fno-implicit-templates'
PREFIX=/data
TOOLCHAIN_DIR=$HOME_DIR/arm-linux-androideabi-4.8
SYSROOT=$TOOLCHAIN_DIR/sysroot
GCC_VERSION=4.9.0
MPFR_VERSION=3.1.2
GMP_VERSION=6.0.0a
RENAMED_GMP_VERSION=6.0.0
MPC_VERSION=1.0.2
LDFLAGS='-lc -ldl -lgcc -lm -static'
LIBS='-lc -ldl -lgcc -lm -lsupc++ -lgnustl_shared -lgmp'
CC=arm-linux-androideabi-gcc
CXX=arm-linux-androideabi-g++
LD=arm-linux-androideabi-ld
RANLIB=arm-linux-androideabi-ranlib
AR=arm-linux-androideabi-ar
STRIP=arm-linux-androideabi-strip
PATH=$TOOLCHAIN_DIR/bin:$PATH
cd $HOME_DIR
mkdir $GCC_BUILD_DIR
tar -jxf gcc-$GCC_VERSION.tar.bz2
cd $HOME_DIR/gcc-$GCC_VERSION
tar -jxf ../gmp-$GMP_VERSION.tar.bz2
mv gmp-$RENAMED_GMP_VERSION gmp
tar -jxf ../mpfr-$MPFR_VERSION.tar.bz2
mv mpfr-$MPFR_VERSION mpfr
tar -zxf ../mpc-$MPC_VERSION.tar.gz
mv mpc-$MPC_VERSION mpc
patch -Np0 -i $HOME_DIR/getpagesize-gcc.patch
patch -Np0 -i $HOME_DIR/mpfr-impl.patch
patch -Np0 -i $HOME_DIR/libcpp-files.patch
patch -Np0 -i $HOME_DIR/libcpp-macro.patch
cd $GCC_BUILD_DIR
../gcc-$GCC_VERSION/configure \
--prefix=$PREFIX --host=$HOST --disable-option-checking --disable-ld \
--enable-shared --enable-languages=c \
--disable-bootstrap -disable-gold --disable-fortran --disable-libssp \
--disable-libquadmath --disable-libquadmath-support --disable-libada \
--disable-multilib --disable-libgomp --disable-cloog --disable-werror \
--with-sysroot=$SYSROOT --disable-nls --disable-long-long
make
sudo make install
Second, the actual error in question.
Code:
../../../gcc-4.9.0/gmp/mpz/powm_ui.c:162: error: undefined reference to '__gmpn_invert_limb'
divrem_1.c:228: error: undefined reference to '__gmpn_invert_limb'
divrem_1.c:149: error: undefined reference to '__gmpn_invert_limb'
divrem_2.c:91: error: undefined reference to '__gmpn_invert_limb'
collect2: error: ld returned 1 exit status
make[2]: *** [cc1] Error 1
make[2]: Leaving directory `/home/jmanley/gcc-android-build/gcc'
make[1]: *** [all-gcc] Error 2
make[1]: Leaving directory `/home/jmanley/gcc-android-build'
make: *** [all] Error 2
Now, some of the patchfiles I made to fix previous errors. Is any of this recommended?
Code:
*** libiberty/getpagesize.c 2005-03-27 07:31:13.000000000 -0800
--- getpagesize.c 2014-07-13 14:59:40.270231633 -0700
***************
*** 60,71 ****
# endif /* PAGESIZE */
#endif /* GNU_OUR_PAGESIZE */
- int
- getpagesize (void)
- {
- return (GNU_OUR_PAGESIZE);
- }
-
#else /* VMS */
#if 0 /* older distributions of gcc-vms are missing <syidef.h> */
--- 60,65 ----
Code:
*** libcpp/files.c 2014-01-02 14:24:45.000000000 -0800
--- files.c 2014-07-13 19:09:23.685783988 -0700
***************
*** 716,726 ****
cpp_error (pfile, CPP_DL_WARNING,
"%s is shorter than expected", file->path);
file->buffer = _cpp_convert_input (pfile,
CPP_OPTION (pfile, input_charset),
buf, size + 16, total,
&file->buffer_start,
! &file->st.st_size);
file->buffer_valid = true;
return true;
--- 716,728 ----
cpp_error (pfile, CPP_DL_WARNING,
"%s is shorter than expected", file->path);
+ off_t ot = (off_t) file->st.st_size;
file->buffer = _cpp_convert_input (pfile,
CPP_OPTION (pfile, input_charset),
buf, size + 16, total,
&file->buffer_start,
! &ot);
! file->st.st_size = ot;
file->buffer_valid = true;
return true;
Code:
*** libcpp/macro.c 2014-02-18 22:05:55.000000000 -0800
--- macro.c 2014-07-13 19:55:27.751477291 -0700
***************
*** 250,256 ****
struct tm *tb = NULL;
struct stat *st = _cpp_get_file_stat (file);
if (st)
! tb = localtime (&st->st_mtime);
if (tb)
{
char *str = asctime (tb);
--- 250,260 ----
struct tm *tb = NULL;
struct stat *st = _cpp_get_file_stat (file);
if (st)
! {
! time_t tt = (time_t) st->st_mtime;
! tb = localtime (&tt);
! st->st_mtime = tt;
! }
if (tb)
{
char *str = asctime (tb);
Code:
*** mpfr/src/mpfr-impl.h 2013-03-13 08:37:36.000000000 -0700
--- mpfr-impl.h 2014-07-13 18:44:36.599599742 -0700
***************
*** 1135,1142 ****
#include <locale.h>
/* Warning! In case of signed char, the value of MPFR_DECIMAL_POINT may
be negative (the ISO C99 does not seem to forbid negative values). */
! #define MPFR_DECIMAL_POINT (localeconv()->decimal_point[0])
! #define MPFR_THOUSANDS_SEPARATOR (localeconv()->thousands_sep[0])
#else
#define MPFR_DECIMAL_POINT ((char) '.')
#define MPFR_THOUSANDS_SEPARATOR ('\0')
--- 1135,1142 ----
#include <locale.h>
/* Warning! In case of signed char, the value of MPFR_DECIMAL_POINT may
be negative (the ISO C99 does not seem to forbid negative values). */
! #define MPFR_DECIMAL_POINT ((char) '.')
! #define MPFR_THOUSANDS_SEPARATOR ('\0')
#else
#define MPFR_DECIMAL_POINT ((char) '.')
#define MPFR_THOUSANDS_SEPARATOR ('\0')

[Xperia E][C1505] Error compile kernel. Help

I'm trying compile My own kernel but always show error
Code:
[email protected]:~/Desktop/kernel_jb/kernel$ export ARCH=arm
[email protected]:~/Desktop/kernel_jb/kernel$ export CROSS_COMPILE=/home/jbliz/Desktop/kernel_jb/toolchains/arm-eabi-linaro-4.6.2/bin/arm-eabi-
[email protected]:~/Desktop/kernel_jb/kernel$ make -j2
HOSTCC scripts/basic/fixdep
HOSTCC scripts/kconfig/conf.o
HOSTCC scripts/kconfig/zconf.tab.o
HOSTLD scripts/kconfig/conf
scripts/kconfig/conf --silentoldconfig Kconfig
warning: (SCSI_SRP) selects SCSI_TGT which has unmet direct dependencies (SCSI && EXPERIMENTAL)
warning: (DRM && ION) selects DMA_SHARED_BUFFER which has unmet direct dependencies (EXPERIMENTAL)
warning: (USB_DWC3) selects USB_XHCI_PLATFORM which has unmet direct dependencies (USB_SUPPORT && USB_XHCI_HCD)
warning: (SCSI_SRP) selects SCSI_TGT which has unmet direct dependencies (SCSI && EXPERIMENTAL)
warning: (DRM && ION) selects DMA_SHARED_BUFFER which has unmet direct dependencies (EXPERIMENTAL)
warning: (USB_DWC3) selects USB_XHCI_PLATFORM which has unmet direct dependencies (USB_SUPPORT && USB_XHCI_HCD)
CHK include/linux/version.h
CHK include/generated/utsrelease.h
HOSTCC scripts/genksyms/genksyms.o
HOSTCC scripts/genksyms/lex.lex.o
HOSTCC scripts/genksyms/parse.tab.o
HOSTLD scripts/genksyms/genksyms
CC scripts/mod/empty.o
HOSTCC scripts/mod/mk_elfconfig
MKELF scripts/mod/elfconfig.h
HOSTCC scripts/mod/file2alias.o
HOSTCC scripts/selinux/genheaders/genheaders
HOSTCC scripts/selinux/mdp/mdp
HOSTCC scripts/mod/modpost.o
HOSTCC scripts/mod/sumversion.o
HOSTCC scripts/kallsyms
HOSTLD scripts/mod/modpost
make[1]: `include/generated/mach-types.h' is up to date.
HOSTCC scripts/conmakehash
CC kernel/bounds.s
GEN include/generated/bounds.h
CC arch/arm/kernel/asm-offsets.s
In file included from include/linux/spinlock.h:50:0,
from include/linux/seqlock.h:29,
from include/linux/time.h:8,
from include/linux/timex.h:56,
from include/linux/sched.h:57,
from arch/arm/kernel/asm-offsets.c:13:
include/linux/preempt.h:110:0: warning: "inc_preempt_count" redefined [enabled by default]
error, forbidden warning: preempt.h:110
make[1]: *** [arch/arm/kernel/asm-offsets.s] Error 1
make: *** [prepare0] Error 2
[email protected]:~/Desktop/kernel_jb/kernel$
preempt.h
Code:
#ifndef __LINUX_PREEMPT_H
#define __LINUX_PREEMPT_H
/*
* include/linux/preempt.h - macros for accessing and manipulating
* preempt_count (used for kernel preemption, interrupt count, etc.)
*/
#include <linux/thread_info.h>
#include <linux/linkage.h>
#include <linux/list.h>
#if defined(CONFIG_DEBUG_PREEMPT) || defined(CONFIG_PREEMPT_TRACER)
extern void add_preempt_count(int val);
extern void sub_preempt_count(int val);
#else
# define add_preempt_count(val) do { preempt_count() += (val); } while (0)
# define sub_preempt_count(val) do { preempt_count() -= (val); } while (0)
#endif
#define inc_preempt_count() add_preempt_count(1)
#define dec_preempt_count() sub_preempt_count(1)
#define preempt_count() (current_thread_info()->preempt_count)
#ifdef CONFIG_PREEMPT
asmlinkage void preempt_schedule(void);
#define preempt_check_resched() \
do { \
if (unlikely(test_thread_flag(TIF_NEED_RESCHED))) \
preempt_schedule(); \
} while (0)
#else /* !CONFIG_PREEMPT */
#define preempt_check_resched() do { } while (0)
#endif /* CONFIG_PREEMPT */
#ifdef CONFIG_PREEMPT_COUNT
#define preempt_disable() \
do { \
inc_preempt_count(); \
barrier(); \
} while (0)
#define sched_preempt_enable_no_resched() \
do { \
barrier(); \
dec_preempt_count(); \
} while (0)
#define preempt_enable_no_resched() sched_preempt_enable_no_resched()
#define preempt_enable() \
do { \
preempt_enable_no_resched(); \
barrier(); \
preempt_check_resched(); \
} while (0)
/* For debugging and tracer internals only! */
#define add_preempt_count_notrace(val) \
do { preempt_count() += (val); } while (0)
#define sub_preempt_count_notrace(val) \
do { preempt_count() -= (val); } while (0)
#define inc_preempt_count_notrace() add_preempt_count_notrace(1)
#define dec_preempt_count_notrace() sub_preempt_count_notrace(1)
#define preempt_disable_notrace() \
do { \
inc_preempt_count_notrace(); \
barrier(); \
} while (0)
#define preempt_enable_no_resched_notrace() \
do { \
barrier(); \
dec_preempt_count_notrace(); \
} while (0)
/* preempt_check_resched is OK to trace */
#define preempt_enable_notrace() \
do { \
preempt_enable_no_resched_notrace(); \
barrier(); \
preempt_check_resched(); \
} while (0)
#else /* !CONFIG_PREEMPT_COUNT */
#define preempt_disable() do { } while (0)
#define sched_preempt_enable_no_resched() do { } while (0)
#define preempt_enable_no_resched() do { } while (0)
#define preempt_enable() do { } while (0)
#define preempt_disable_notrace() do { } while (0)
#define preempt_enable_no_resched_notrace() do { } while (0)
#define preempt_enable_notrace() do { } while (0)
//20130122-JordanChen
#define add_preempt_count_notrace(val) do { } while (0)
#define sub_preempt_count_notrace(val) do { } while (0)
#define inc_preempt_count_notrace() do { } while (0)
#define dec_preempt_count_notrace() do { } while (0)
#define inc_preempt_count() do { } while (0)
#define dec_preempt_count() do { } while (0)
//20130122-JordanChen
#endif /* CONFIG_PREEMPT_COUNT */
#ifdef CONFIG_PREEMPT_NOTIFIERS
struct preempt_notifier;
/**
* preempt_ops - notifiers called when a task is preempted and rescheduled
* @sched_in: we're about to be rescheduled:
* notifier: struct preempt_notifier for the task being scheduled
* cpu: cpu we're scheduled on
* @sched_out: we've just been preempted
* notifier: struct preempt_notifier for the task being preempted
* next: the task that's kicking us out
*
* Please note that sched_in and out are called under different
* contexts. sched_out is called with rq lock held and irq disabled
* while sched_in is called without rq lock and irq enabled. This
* difference is intentional and depended upon by its users.
*/
struct preempt_ops {
void (*sched_in)(struct preempt_notifier *notifier, int cpu);
void (*sched_out)(struct preempt_notifier *notifier,
struct task_struct *next);
};
/**
* preempt_notifier - key for installing preemption notifiers
* @link: internal use
* @ops: defines the notifier functions to be called
*
* Usually used in conjunction with container_of().
*/
struct preempt_notifier {
struct hlist_node link;
struct preempt_ops *ops;
};
void preempt_notifier_register(struct preempt_notifier *notifier);
void preempt_notifier_unregister(struct preempt_notifier *notifier);
static inline void preempt_notifier_init(struct preempt_notifier *notifier,
struct preempt_ops *ops)
{
INIT_HLIST_NODE(&notifier->link);
notifier->ops = ops;
}
#endif
#endif /* __LINUX_PREEMPT_H */
Toolchains by DooMLoRD
Code:
/home/jbliz/Desktop/kernel_jb/toolchains/arm-2009q3/
/home/jbliz/Desktop/kernel_jb/toolchains/arm-2010.09/
/home/jbliz/Desktop/kernel_jb/toolchains/arm-2011.03/
/home/jbliz/Desktop/kernel_jb/toolchains/arm-2011.09/
/home/jbliz/Desktop/kernel_jb/toolchains/arm-eabi-4.4.3/
/home/jbliz/Desktop/kernel_jb/toolchains/arm-eabi-linaro-4.6.2/

mkbootimg created boot.img creation discrepenacy

Hi,
I have noticed a discrepancy which I am unable to understand and appreciate if someone can provide a clarification in case they have noticed the same issue. I tried to split (using unmkbootimg) boot.img (from Xiaomi Mi MAX update ROMs) and merged it back (using mkbootimg) and found that the newly made boot.img was smaller by 1354 bytes. Appreciate your reply if I am missing anything.
% ls -l boot.img ../boot.img
-rw-rw-r-- 1 skanduru skanduru 12924234 Jan 1 2009 ../boot.img
-rw-rw-r-- 1 skanduru skanduru 12922880 Jan 15 01:07 boot_new.img
% cat output.txt
# kernel written to 'kernel' (10172221 bytes)
# ramdisk written to 'ramdisk.cpio.gz' (2746601 bytes)
# To rebuild this boot image, you can use the command:
mkbootimg --base 0 --pagesize 2048 --kernel_offset 0x80008000 --ramdisk_offset 0x81000000 --second_offset 0x80f00000 --tags_offset 0x80000100 --cmdline
'console=ttyHSL0,115200,n8 androidboot.console=ttyHSL0 androidboot.hardware=qcom msm_rtb.filter=0x237 ehci-hcd.park=3 androidboot.bootdevice=7824900.sdhci
lpm_levels.sleep_disabled=1 earlyprintk ramoops_memreserve=4M' --kernel kernel --ramdisk ramdisk.cpio.gz -o boot_new.img
A bindiff of the two images shows that the original boot.img has some stuff (1354 bytes) appended at the bottom which makes the difference. The net result is the boot_new.img doesn't boot up. Just wondering if someone has seen this issue.

boot image to try
The link to boot.img image to try out mkbootimg issue. We can see that @C53000, the original boot.img has extra stuff (1374 bytes).
Image can be downloaded from (Couldn't update it in the previous query)
s000 DOT tinyupload DOT com/?file_id=42124441031490820660

skanduru said:
The link to boot.img image to try out mkbootimg issue. We can see that @C53000, the original boot.img has extra stuff (1374 bytes).
Image can be downloaded from (Couldn't update it in the previous query)
s000 DOT tinyupload DOT com/?file_id=42124441031490820660
Click to expand...
Click to collapse
Could be an issue with Xiaomi image as it doesn't specify second_bootloader size, but appends it. Tried this change and it works. Not sure if it might be the case for potentially other manufacturer's boot.img. Posting it if it could be of some use.
--- a/mkbootimg/unmkbootimg.c
+++ b/mkbootimg/unmkbootimg.c
@@ -80,6 +80,30 @@ int usage(void)
return 1;
}
+int maybe_fix_second_image_size(boot_img_hdr *hdr, void *file_data)
+{
+ int offset = ((hdr->kernel_size + hdr->ramdisk_size
+ + 2*hdr->page_size - 1) / hdr->page_size) * hdr->page_size;
+ char *second_image = ((char *)file_data + offset);
+ u_int16_t *s = (u_int16_t *) second_image;
+ int is_second_image_true = 0;
+
+ if (s[0]) {
+ /*
+ * Second_image does exist ! Calculate the size and fix the
+ * size in hdr.
+ */
+ int size = 0;
+ while (s[0]) {
+ size += 2;
+ s++;
+ }
+ hdr->second_size = size;
+ is_second_image_true = 1;
+ }
+ return is_second_image_true;
+}
+
int main(int argc, char **argv)
{
void *file_data = 0;
@@ -160,7 +184,13 @@ int main(int argc, char **argv)
hdr->ramdisk_size);
}
- if(hdr->second_size != 0) {
+ /*
+ * Even though the second_size is 0, some vendors may place secondary
+ * image there, for ex. Xiaomi. In such a case do calculate the size
+ * based on termination with a null.
+ * XXX: Temp fix.
+ */
+ if(hdr->second_size != 0 || maybe_fix_second_image_size(hdr, file_data)) {
offset = ((hdr->kernel_size + hdr->ramdisk_size
+ 2*hdr->page_size - 1) / hdr->page_size) * hdr->page_size;
if (save_file(second_fn, &((char *)file_data)[offset],