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[Q] Nexus S kernel compile and kernel serial console output tracking

Hi,
I am one of those who want to upload custom kernel in my Nexus S (SHW-M200K which is for Korean). When I updated my android by the methods in android source. It worked.
I also downloaded android kernel by using following commands.
$ git clone samsung.git kernel
$ git branch -a
$ git checkout remotes/origin/android-samsung-2.6.35-gingerbread
And, configured the kernel using herring_defconfig without any modification. The compilation was okay, but the device cannot be booted. I used fastboot to flash my new kernel into the device.
I am wondering if I know how to make the device booted with my new kernel.
Second, I want to see the kernel bootlog, the device is not working with my kernel, so I cannot use adb shell dmesg. Is there a way to see device's serial out? and is there a way to configure the kernel to make it show kernel logs to microUSB port?
I googled and found some links, unfortunately I cannot pase the url because I am newbie , but I did not work in my environment. The contents of the link uses 150k resistor to link ID and GND of microUSB ports and links D+/D- to UART port.
I also found some threads about Nexus S's kernel console out, but they have a little message which makes me confused.
I also found microUSB to serial cable, which is named as FlexSerial™ Serial (RS232) Data Cable for Samsung Nexus S, I cannot also attach url links, and you can easily found the module by using google. But I am not sure it will work or not. Is there anybody used this device?
Finally, I will also wonder if I know a specific configuration in kernel to see kernel's serial out?
It would be very nice if you let me know how to do or give me useful links.
Thanks in advance.

[Q] kernel compilation steps for starters

Hi guys,
I'd like to tinker around a bit with the tiamat or other kernels for the Xoom
are the following steps enough to get it working ?
- clone the repo
- adjust toolchain paths (or create an external script that does it)
- make stingray_defconfig
- make -j2
- test-boot the zImage via fastboot
- if it's successful copy over the kernel-modules & flash the kernel via fastboot
how about an initramfs ?
have I forgotten anything ?
Many thanks in advance for your help !
edit:
slowly understanding how all this works,
still might need some help

I think that will get you started. I'm not an expert, but when I'm tinkering with kernels I pull the proc config strait from the device after flashing the kernel I want to modify. That way I know that the default config is correct. For example, if I wanted to modify the kernel running on an EOS nightly, after cloning the repo I would flash the EOS nightly ROM containing the kernel I want to modify. Then run the following commands to pull the kernel config from the kernel running on my device:
Code:
adb pull /proc/config.gz .
gunzip config.gz
mv config .config
The .config then goes in the root of the kernel source directory. That may do exactly the same thing as the "make defconfig" you mentioned but I just prefer to trust the defaults from the ROM and not the repo.

[Q] Help please compiling kernel with initramfs support

Hi my name is ashy and I need some help regarding building a kernel from source for an ongoing project called H1droid here: h**p://samsungi8320.freeforums.org/portal.php
Basically I am just getting into this kind of stuff and at best Iam a hacker and a modder not a developer, so Linux is pretty new to me. However I learn fast and have a good grasp on what's what.
I am trying to build the Kernel for this project from this source h**p://samsungi8320.freeforums.org/onenand-mtd-multiboot-recovery-cm7-2rc1-t765.html
These sources were created originally by R3D4 who doesn't come to our fourms any more, so I am here to ask for help.
In a nut shell I am trying to build the kernel from R3D4's sources. I have Ubuntu, the tool chains, cloned the source and have managed to build the kernel. The problem is that the kernel requires to be in uImage format with built in ramdisk, however for the life of me I can't figure out how to create the valid boot.img..
I have pulled the config file from the device to use as the default .config, and haven't changed anything in menuconfig when compiling.
I have tried flashing the resulting image to the device, but it doesn't boot at all. It seems that there is no ramdisk to boot a rootfs.
I notice in .config it expects an initramfs to be in a specified directory, however my problem is I have no idea how to create the initramfs to build into the kernel when compiling.
This is probably something easy, but I have searched and searched and can't figure it out, so I am asking here for someone who has the knowledge if they can guide me in the right direction as to how to build the initramfs into the kernel and then compile it as a boot.img to flash via recovery.
I appreciate any and all help.
Thanks, ashy

Please help!
Update: I have managed to compile the kernel with built in initramfs, however the phone still doesn't boot.
Can anybody help here I'm stumped. Iam using Ubuntu 11.10 in VMware and these are the steps I have taken:
1. Clone sources as in first post
2. copy initramfs files into directory specified in config file: CONFIG_INITRAMFS_SOURCE="../out/target/product/nowplus/root"
2. Open terminal in Kernel directory
3. use command: make ARCH=arm nowplus_defconfig (this is the config file from the phone)
4. start the build of the kernel: make ARCH=arm CROSS_COMPILE=/home/user/cm7/arm-2012.03/bin/arm-none-eabi- uImage
During the compile there are warnings regarding unused variables or something, but believe these are normal. However at the end of the build modpost reports: WARNING: modpost: Found 2 section mismatch(es).
Is this significant?
Could really do with some help here, I am new at this stuff and getting really frustrated as I've been at it for 2 weeks now. I have searched and searched the whole internet for an answer.

ashyx said:
Update: I have managed to compile the kernel with built in initramfs, however the phone still doesn't boot.
Can anybody help here I'm stumped. Iam using Ubuntu 11.10 in VMware and these are the steps I have taken:
1. Clone sources as in first post
2. copy initramfs files into directory specified in config file: CONFIG_INITRAMFS_SOURCE="../out/target/product/nowplus/root"
2. Open terminal in Kernel directory
3. use command: make ARCH=arm nowplus_defconfig (this is the config file from the phone)
4. start the build of the kernel: make ARCH=arm CROSS_COMPILE=/home/user/cm7/arm-2012.03/bin/arm-none-eabi- uImage
During the compile there are warnings regarding unused variables or something, but believe these are normal. However at the end of the build modpost reports: WARNING: modpost: Found 2 section mismatch(es).
Is this significant?
Could really do with some help here, I am new at this stuff and getting really frustrated as I've been at it for 2 weeks now. I have searched and searched the whole internet for an answer.
Click to expand...
Click to collapse
Ok have managed to make a little progress, it seems the rootfs is loading as it boots up to a screen with blue A N D R O I D text and then changes to a flashing cursor in the top left of the screen. I guess this means the kernel isn't booting.
Still looking for pointers out there on this, can nobody give me a hint or a way to debug this problem?

ashyx said:
Ok have managed to make a little progress, it seems the rootfs is loading as it boots up to a screen with blue A N D R O I D text and then changes to a flashing cursor in the top left of the screen. I guess this means the kernel isn't booting.
Still looking for pointers out there on this, can nobody give me a hint or a way to debug this problem?
Click to expand...
Click to collapse
Hey, like you i'm an user which enjoy to experiment stuff with linux, so, i want just thank you to share your experience, it helped me

Infinity JB 10.4.4.23 Compat-Wireless Drivers for RTL8187 Cards Inside

I posted a question earlier that got no traction regarding compiling the RTL8187 drivers for the infinity for use in backtrack for ARM.
I have since completed the compile and have successfully used the adapter I bought on the tablet with them. What is attached are the compiled compat-wireless drivers, specifically: compat-wireless-3.6.8-1-snpc.tar.bz2
They include the "mac80211.compat08082009.wl_frag+ack_v1.patch" and the "channel-negative-one-maxim.patch"
I am attaching them for those interested or who have a similar need. I am not interested in being bombarded with questions/complaints about it not working for them or whatever. I may post a tutorial later with the problems I ran across and how I compiled these drivers that may help others with different chipsets.
These drivers work successfully with BT5 for ARM on my infinity and an ebay RTL8187L chipset external USB wireless device. To see more ID's they might work check here for RTL8187 PCI ID's that compat-wireless drivers might work for: http://linuxwireless.org/en/users/Drivers/rtl8187
Once in backtrack you will need to MAKE SURE the built in wireless is turned off on the tablet then in terminal with SU:
rmmod bcmdhd.ko
You will have to have the compat-wireless package I referenced above downloaded and uncompress and run: make wlunload in the folder you uncompress it to.
This will get rid of cfg80211.ko rmmod would probably work for that too but I know this works.
Now insmod in the following order:
insmod eeprom_93cx6.ko
insmod compat.ko
insmod cfg80211.ko
insmod mac80211.ko
insmod rtl8187.ko
It can all be scripted, feel free to do so.
With your wireless device plugged in to USB run airmon-ng and you should see your card in the list.
You will have to of course reboot to re-enable the built-in wireless.
Enjoy!

If you ever get the time I would appreciate a brief tutorial on the steps you took to build the modules. I've been struggling with doing this on the nexus 7 for a few days now and don't seem to be making much headway.

Nexus 7
Hi,
Yes please post a tutorial as I'm using a Nexus 7 also.
I already use a modified kernel on my Galaxy Nexus where I don't need to do those modification it's all built in the kernel (http://www.kernel-xp.net/index.php/en/) and would like the same but I would also take your procedure
Thank you!

I am also working on this and need help, to install the compat drivers i need the source code for my kernel but i dont know where or how to unpack the source code so that compat wireless will recognize it, i think it said in /lib/modules/*mykernelsource* if anyone is reading this and can help please reply with instructions thank you

compiling and building modules
alexcass4 said:
I am also working on this and need help, to install the compat drivers i need the source code for my kernel but i dont know where or how to unpack the source code so that compat wireless will recognize it, i think it said in /lib/modules/*mykernelsource* if anyone is reading this and can help please reply with instructions thank you
Click to expand...
Click to collapse
This is something that I am also struggling with. Any help or direction would be much appreciated.

WiFi Chipset for Galaxy Note 3 Neo?

Does anyone know which wifi chipset the Galaxy Note 3 Neo (SM-N7505) uses? I upgraded mine to LineageOS 14.1 (Android 7.1.2) and I want to install the nexmon firmware, but it's not clear to me which firmware to build. I see some places say it's bcm4339, but I see references to 4335 on the device:
$adb shell 'ls /vendor/firmware'
bcm4335_V0105.0586.hcd
bcm4335_V0105.0586_wisol.hcd
fimc_is_fw2.bin
mfc_fw.bin
setfile_6b2.bin
setfile_imx175.bin
$ adb shell 'ls /system/etc/wifi'
bcmdhd_apsta.bin
bcmdhd_ibss.bin
bcmdhd_mfg.bin
bcmdhd_sta.bin
cred.conf
nvram_mfg.txt
nvram_net.txt
p2p_supplicant_overlay.conf
wpa_supplicant.conf
wpa_supplicant_overlay.conf

I believe it is the bcm4339, I am currently working on a custom kernel to use external adapters on kali nethunter, While tweaking I found out that the default deconfig files uses bcm4339 drivers not the 4335 one