Hi guys!
Someone requested a tutorial on how to build the kernel source code, so I thought I might as well do it I'll give you a bit more information too.
Maybe this will kick start kernel development a little bit too. Who knows.
Anyway:
1. Set up your build environment as per this guide by AOSP here: http://source.android.com/source/initializing.html
This guide will be primarily aimed at Ubuntu, but it should be easy enough to do on other Linux PCs. Ubuntu is highly recommended. And don't ask about Windows.
2. Download the toolchains: http://code.google.com/p/rohan-kernel-evita/downloads/detail?name=toolchains.tar.gz&can=2
I've hosted both GCC 4.4 and GCC 4.6 (prebuilt) on my Google Code page. These are for Linux.
Download the toolchain package here: http://code.google.com/p/rohan-kernel-evita/downloads/detail?name=toolchains.tar.gz&can=2
Then un-tar the archive and extract it to your home folder so that the path to the toolchain directories are ~/toolchain/whatever-one-you-want
3. At this point you can decide which kernel source you want to download. There are really two sources.
The first choice is getting it from HTC Dev directly. This is good if you want to build your kernel for a Sense 4 ICS ROM. If you want to build for AOSP/JB, then scroll down below all the following HTC stuff.
------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
To use HTC's source:
Go to HTCdev.com and make an account. Then download the source code for our device (I'd recommend the "One X" source under carrier "AT&T" version "2.20". Let the zip file download and extract it to your home folder (so the path is /home/user/evita-ics..../
To build HTC's source, run these commands:
Code:
cd ~/evita-ics-whatever_the_directory_is_named
export ARCH=arm
make elite_defconfig
Second command is saying what type of architecture we want (we are compiling for ARM processors, so we want ARM)
Third command is saying to make the default config for our device (whose hardware is codenamed "elite")
Then to build the actual kernel:
Code:
make -j# ARCH=arm CROSS_COMPILE=~/toolchain/arm-eabi-4.4.3/bin/arm-eabi-
In the command above, there is "-j#". Replace the "#" with the number of CPUs you have.
Ask me about it if you need help. That should be it! Let the build go and in a few minutes you should have a zImage file located at ~/evita-ics-..../arch/arm/boot. That is the actual kernel.
To test out the zImage (kernel), connect your device via fastboot mode and type:
Code:
fastboot boot /path/to/zImage
Combined with the ramdisk, thats what makes the boot.img file. Eventually if you want to distribute your kernel, you should use an installer that injects the zImage into the boot.img or combine the zImage with a ramdisk to make a boot.img. I can do a tutorial on that later on as well.
------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
To get the "other" source:
This source is based off of HTC's source and includes other devices as well in it (the One S and Evo 4G LTE). Its good if you want to build JB AOSP kernels.
To download this kernel source do this:
Code:
mkdir ~/kernel
cd ~/kernel
git clone https://github.com/CyanogenMod/android_kernel_htc_msm8960.git -b android-msm-evita-3.0
This version also includes a number of optimizations and odd bug fixes present in the HTC version.
To build this second source, run these commands:
Code:
cd ~/kernel/android_kernel_htc_msm8960
export ARCH=arm
make elite_defconfig
Second command is saying what type of architecture we want (we are compiling for ARM processors, so we want ARM)
Third command is saying to make the default config for our device (whose hardware is codenamed "elite")
Then to build the actual kernel:
Code:
make -j# ARCH=arm CROSS_COMPILE=~/toolchain/arm-linux-androideabi-4.6/bin/arm-eabi-
In the command above, there is "-j#". Replace the "#" with the number of CPUs you have.
Ask me about it if you need help. That should be it! Let the build go and in a few minutes you should have a zImage file located at ~/evita-ics-..../arch/arm/boot. That is the actual kernel.
To test out the zImage (kernel), connect your device via fastboot mode and type:
Code:
fastboot boot /path/to/zImage
Combined with the ramdisk, thats what makes the boot.img file. Eventually if you want to distribute your kernel, you should use an installer that injects the zImage into the boot.img or combine the zImage with a ramdisk to make a boot.img. I can do a tutorial on that later on as well.
-----------------------------------------------------------------------------
The second option is also a bit better as it uses the 4.6 toolchain instead of GCC 4.4. HTC's source doesn't work with GCC 4.6 so it can't be used without changes that the second source has.
If you have any questions, feel free to post here, message me on twitter (@rohanXm), chat me on IRC (#HTC-One-XL) or PM me!
If this helped you, please consider hitting the donation link under my username on the left. Donations are never required but always appreciated.
Instead of downloading cm10 the readme inclided with the HTC source has directions for getting a tool chain which will compile the source.
Sent from my HTC One X using Tapatalk 2
Perfect. Now I just have to read.
Sent from my HTC One XL bumping it
rohan32 said:
Code:
repo init -u git://github.com/CyanogenMod/android.git -b jb
Click to expand...
Click to collapse
FYI, It looks like the branch name has changed. When I changed "jb" to "jellybean" the repo init command worked.
Rohan. You are one bad MF'er
Sent from my twin turbo'ed OneXL rocking rezound beats
rohan32 said:
2. You can either try to find a standalone package of the precompiled toolchain, or you are going to need to download a ROMs source. I'd recommend downloading a ROMs source since I've never found a good toolchain that worked for me. If you find one that works, post below
For now we will download CM10 since that seems like the defacto standard.
Click to expand...
Click to collapse
I downloaded the 2.20.502.7 kernel source and when I extracted it there was a file named evita_readme.txt which gave another, possibly more "official", location for downloading a toolchain:
--Please follow below command to download the official android toolchain: (arm-eabi-4.4.3)
git clone https://android.googlesource.com/platform/prebuilt
Click to expand...
Click to collapse
I just performed a build with this toolchain but got this error when I attempted to load zImage via fastboot:
c:\>fastboot flash boot zImage
sending 'boot' (5140 KB)...
OKAY [ 1.044s]
writing 'boot'...
FAILED (remote: image error! (BootMagic check fail))
finished. total time: 1.077s
Click to expand...
Click to collapse
I'm not sure if this is caused by the toolchain or if I screwed something up. Have you ever seen this error before?
EDIT: Ok I see what I did incorrectly. The zImage needs to be "Combined with the ramdisk". You wouldn't know how to perform this operation... would you?
denversc said:
I downloaded the 2.20.502.7 kernel source and when I extracted it there was a file named evita_readme.txt which gave another, possibly more "official", location for downloading a toolchain:
I just performed a build with this toolchain but got this error when I attempted to load zImage via fastboot:
I'm not sure if this is caused by the toolchain or if I screwed something up. Have you ever seen this error before?
EDIT: Ok I see what I did incorrectly. The zImage needs to be "Combined with the ramdisk". You wouldn't know how to perform this operation... would you?
Click to expand...
Click to collapse
You are trying to flash a zImage
To my knowledge, only booting zImages work on this device. For the time being just boot the zImage (use fastboot boot zImage)
I will make a tutorial on how to combine the zImage created with a ramdisk to make a boot.img when I get the chance
denversc said:
FYI, It looks like the branch name has changed. When I changed "jb" to "jellybean" the repo init command worked.
Click to expand...
Click to collapse
Oops, my bad! That was a mistake. AOKP uses -jb and CM uses -jellybean so I got them switched fixed now
Out of any device I've seen more people actually interested in helping and learning to help then any other community. I've watched noobs become less noobish.. I've watched skizz learn how to make themes. Hell I've learned 10 fold what I knew before this phone myself.
That is beautiful, and now such an informed, helpful post such as this.
Have great Sunday you guys! I think I might give this a shot!
Sent from my One X
I'll streamline this process in a bit, so that you don't need to download CM10
Edit: cleaned up post, now I'm uploading just the toolchains. Its a tar.gz archive, around 150mb. Much better than downloading the entire CM10 source
rohan32 said:
You are trying to flash a zImage. To my knowledge, only booting zImages work on this device. For the time being just boot the zImage (use fastboot boot zImage)
Click to expand...
Click to collapse
Thanks for your response, rohan. You are absolutely right: I was incorrectly attempting to flash zImage straight to the boot partition, and the error produced by flashboot was justified. I have since successfully "tested out" my compiled zImage by flashing it via "fastboot boot zImage" and it worked like a charm! I ported the modifications from sbryan's Blackout BeastMode kernel and I am now able to OC to 2106 MHz and UC to 192 MHz. It's been running solid for the past few hours at least
Of course, the kernel reverts back to the one stored in the boot partition after a reboot, and I want my shiny new kernel to "stick". I've done a bit of research on this topic and found some information about combining my zImage with a ramdisk into a "real" boot.img but have not yet been successful in creating a boot.img which does not bootloop after flashing it.
For example, I found an article on xda called Basic Kernel Kitchen for Minor Kernel Tweaking which points to a "kitchen sink" tool for creating a boot.img from a zImage and a ramdisk. My problem is that I don't know where to get or how to make a ramdisk. So I tried using the ramdisk from the boot.img of the ROM that I am currently running (CleanROM 4.5 DE) but just got into a bootloop. I've since been doing some yard work today so haven't gotten back to investigating further.
I also found another program named abootimg which can also produce a boot.img from a zImage abd a ramdisk, but when I tried it an error message about my zImage being "too big" was produced.
If it's not obvious yet, I am kind of fumbling around in the dark as compiling and deploying custom kernels is completely new to me! But this post was the most valuable resource I've come across in getting to this point. Thanks so much for writing it! I eagerly await your next article about creating the boot.img
---------- Post added at 06:05 PM ---------- Previous post was at 05:50 PM ----------
rohan32 said:
cleaned up post
Click to expand...
Click to collapse
Thanks for cleaning up the post rohan. I have a few follow-up questions/comments:
missing toolchains link -- the post says "Download the toolchains:" but there is no link to download anything... did you forget to paste the link?
official toolchain -- That's great that you uploaded the toolschains to save tonnes of bandwidth. The CM10 source was taking a VERY long time for me to grab. However, I imagine some people (like me) would prefer to get the toolchain from an "official" source. In the "evita_readme.txt" file of the kernel sources downloaded from HTC dev it instructs one to use the official sources from "git clone https://android.googlesource.com/platform/prebuilt". This is the toolchain that I used and it successfully built the zImage.
ko files -- I noticed in the ZIP file for Blackout BeastMode, in additional to installing the zImage it also puts a bunch of "ko" (kernel modules I believe) into the /system partition (eg. qce40.ko). Should I also be deploying .ko files from my build to the device?
Thanks!
denversc said:
Thanks for your response, rohan. You are absolutely right: I was incorrectly attempting to flash zImage straight to the boot partition, and the error produced by flashboot was justified. I have since successfully "tested out" my compiled zImage by flashing it via "fastboot boot zImage" and it worked like a charm! I ported the modifications from sbryan's Blackout BeastMode kernel and I am now able to OC to 2106 MHz and UC to 192 MHz. It's been running solid for the past few hours at least
Of course, the kernel reverts back to the one stored in the boot partition after a reboot, and I want my shiny new kernel to "stick". I've done a bit of research on this topic and found some information about combining my zImage with a ramdisk into a "real" boot.img but have not yet been successful in creating a boot.img which does not bootloop after flashing it.
For example, I found an article on xda called Basic Kernel Kitchen for Minor Kernel Tweaking which points to a "kitchen sink" tool for creating a boot.img from a zImage and a ramdisk. My problem is that I don't know where to get or how to make a ramdisk. So I tried using the ramdisk from the boot.img of the ROM that I am currently running (CleanROM 4.5 DE) but just got into a bootloop. I've since been doing some yard work today so haven't gotten back to investigating further.
I also found another program named abootimg which can also produce a boot.img from a zImage abd a ramdisk, but when I tried it an error message about my zImage being "too big" was produced.
If it's not obvious yet, I am kind of fumbling around in the dark as compiling and deploying custom kernels is completely new to me! But this post was the most valuable resource I've come across in getting to this point. Thanks so much for writing it! I eagerly await your next article about creating the boot.img
---------- Post added at 06:05 PM ---------- Previous post was at 05:50 PM ----------
Thanks for cleaning up the post rohan. I have a few follow-up questions/comments:
missing toolchains link -- the post says "Download the toolchains:" but there is no link to download anything... did you forget to paste the link?
official toolchain -- That's great that you uploaded the toolschains to save tonnes of bandwidth. The CM10 source was taking a VERY long time for me to grab. However, I imagine some people (like me) would prefer to get the toolchain from an "official" source. In the "evita_readme.txt" file of the kernel sources downloaded from HTC dev it instructs one to use the official sources from "git clone https://android.googlesource.com/platform/prebuilt". This is the toolchain that I used and it successfully built the zImage.
ko files -- I noticed in the ZIP file for Blackout BeastMode, in additional to installing the zImage it also puts a bunch of "ko" (kernel modules I believe) into the /system partition (eg. qce40.ko). Should I also be deploying .ko files from my build to the device?
Thanks!
Click to expand...
Click to collapse
Hey!
Sorry, set it to upload then got distracted Link posted
The reason why your boot.imgs bootloop is because there is a special ramdisk address that needs to be set when combining the ramdisk with the zImage, and most kitchens don't support this. You also need to set the address after setting the base value.
I will post a guide on how to make it a real boot.img whenever I get the chance.
I'm telling you people, Rohan is a BOSS. Most helpful dev I know.
Sent from my HTC One XL using xda app-developers app
rohan32 said:
Hey!
Sorry, set it to upload then got distracted Link posted
The reason why your boot.imgs bootloop is because there is a special ramdisk address that needs to be set when combining the ramdisk with the zImage, and most kitchens don't support this. You also need to set the address after setting the base value.
I will post a guide on how to make it a real boot.img whenever I get the chance.
Click to expand...
Click to collapse
I have the zImage thanks to your tutorial, but I want to know how to create the kernel zip, whenever you have time will be amazing if you can post a guide, I'm really looking forward to that guide, because i haven't been able to locate a guide that works
Sent from my HTC One XL using xda premium
rohan32 said:
Hi guys!
Second command is saying what type of architecture we want (we are compiling for ARM processors, so we want ARM)
Third command is saying to make the default config for our device (whose hardware is codenamed "elite")
Then to build the actual kernel:
Code:
make -j# ARCH=arm CROSS_COMPILE=~/toolchain/arm-linux-androideabi-4.6/bin/arm-eabi-
Click to expand...
Click to collapse
This is the correct make for "other source" kernel.
Code:
make -j# ARCH=arm CROSS_COMPILE=~/toolchain/arm-linux-androideabi-4.6/bin/[COLOR="Red"]arm-linux-androideabi-[/COLOR]
Can you make a tutorial on how to insert governors into a kernel?
Compiling problem
Hey man,
Please help me I followed your article but when I try copile with:
make -j2 ARCH=arm CROSS_COMPILE=~/toolchain/arm-eabi-4.4.3/bin/arm-eabi
I got something like this:
/home/martin/toolchain/arm-eabi-4.4.3/bin/../lib/gcc/arm-eabi/4.4.3/../../../../arm-eabi/bin/as: error while loading shared libraries: libz.so.1: cannot open shared object file: No such file or directory
Thanks
UPDATE:
now its work
I went deeper and install lib32z1 with "sudo apt-get install lib32z1"... now its work
My device repositories are not available on github, But I got device tree and vendor blobs by making changes in similar device repo. That reference device's kernel's lineageos_defconfig is situated in htc msm8974 kernel repo. So how can I get lineageos_defconfig for my device, and which other my device related kernel files(.dtsi or any other) I have to push in htc msm8974 repo and get those files to make things ready for build?
Please help......
Hi guys,
I was working on this since some time and here it is
Please read FAQ first
FAQ :
Can I compile a MT6589 kernel for every phone ?
As you know, a MT6589 kernel won't fit in every MT6589 smartphone because of specific configs/files in the kernel source tree.
So, if you compile my kernel which is expected to work on a Faea F2S don't expect it to work on a Acer Liquid E3 for example.
Conclusion : You have to get the kernel source for your phone
How can I check my kernel source ?
Of course, this is not enough to see "source code for ZTE N986", you have to check if it's full or not and if it works.
Most people don't know what is working kernel source. You just have to read the GPL guidelines that every manufacturer have to complain with :
“ The source code for a work means the preferred form of the work for making modifications to it. For an executable work, complete source code means all the source code for all modules it contains, plus any associated interface definition files, plus the scripts used to control compilation and installation of the executable. ”
The part which has not to be included is the toolchain but there should reference to it (which toolchain to use)
For MT6589 kernel, the toolchains arm-eabi-4.6 and arm-linux-androideabi-4.6 should be used. (mtk used arm-linux-androideabi-4.6 for kernel but it should be arm-eabi-4.6)
So now you know which toolchain to grab and then for kernel source you have to check this minimal structure :
bionic
kernel
mediatek
build
config
custom
kernel
platformREADME
If I have kernel source, can I build it for my device ?
Erm... Sometimes the structure is here but the kernel source is messy... Why ?
Because you were not provided the matching source of the kernel used on your smartphone and the reasons are multiple (I won't give details).
So, the idea is to run a first build. If you get errors, then check the step above about toolchain and structure.
The next step for fixing errors is to play with source. Good luck for that.
What are the benefits of a custom kernel for MT6589 ?
First big benefit is to introduce kitkat compatibility because there was an issue on android binder driver in mtk kernel source.
Next benefit is to be able to remove some stuff from mtk which is useless on user side and waste ressources (a lot of debug for example).
Others benefits will be in optimizations or new features (see frandom for example)
HOWTO :
Build from my repo (specific devices supported) - It's not for compiling your kernel source but to understand how kernel build worksI explain how to build from my repo first because it can help you to understand how you should build kernel source
Prerequisites : A build environment (actually Ubuntu Saucy x64 with build-essentials, ccache, repo, java, perl v5.14+ and openssl) and I won't explain how to get one as there is multiple howto on the net.
For repo, the idea is to create a bin directory in your $HOME (usually /home/accountname/), copy repo binary inside it and then add this bin to $PATH var.
BE CAREFULL TO WHAT YOU DO WITH $PATH VAR ! I always see people doing :
Code:
export PATH=/home/foo/bin
this is erasing $PATH var, just check before and after with echo $PATH
So the idea is to introduce your path AFTER the actual $PATH var
This is easy...
Code:
export PATH=[COLOR="red"]$PATH:[/COLOR]/home/foo/bin
And of course, $PATH is reset once you close terminal and I won't explain how to set $PATH automatically.
Once you got this, everything should be working and it will be easy
Code:
mkdir workdir
cd workdir
repo init -u https://github.com/Dr-Shadow/android_kernel_mt6589_manifest.git -b master
repo sync
Then you should get this in your workdir :
kernel
manifest
mtk-tools
out
ramdisk
scripts
toolchainJust do :
Code:
cd kernel
./certificates.sh
./build.sh
./certificates.sh is needed only once (it's for signing flashable zip and it will setup some keys for it, just reply to questions and don't add passphrase)
And of course, the build.sh contains most things you need to know on steps for building kernel (which commands to use) and you need to know how it works Build from your own kernel source
I'm building the doc... I have to remind which vars need to be overriden
Reserved
Reserved #2
Thanks for making this thread brother it will help us to learn... Subscribed
Looking forward to the how-to to build with your own kernel source.
Dr-Shadow said:
Hi guys,
I was working on this since some time and here it is
Click to expand...
Click to collapse
Thank you Dr-Shadow! This is very cool. I'm going to try it out!
Great
It's always nice to see further development on MTK Based Devices.
Regards
I'll chip in and say thanks too. Finally getting around to trying to compile Alcatel's OneTouch Hero (aka TCL Y910) provided sources.
I might be in as well with A820, but I'm relatively new to Android and have only done porting of 4.1 and 4.2 so far.
Haven't built anything although I have some knowledge about the source code and SDK, which I've only used for reference purposes and the tools from it.
Will try to compile the stock kernel this weekend, but I'm not quite sure if something else is needed, even if the kernel source seems complete to me.
I'm a quick learner and have a lot of programming experience in other technologies, even thought I'm more of a front-end developer these days.
Introduction
You probably know already that starting from Android 5.x (Lollipop) compiled roms (aosp,cm,stock) are not compressed anymore the way they used to be on previous android versions. On previous versions all content inside /system folder that has to be extracted within our device was either uncompressed (simple /system folder inside our flashable zip) or compressed in a system.img file, which it is a ext4 compressed file; both of these, anyway, were readable and we could see all system files (app,framework, etc).
The problem comes in >=5.0 versions, this method is not used anymore. Why? Because roms started to be always larger, so it is necessary to compress them even more.
Note : Introduction was taken from here : https://forum.xda-developers.com/an.../how-to-conver-lollipop-dat-files-to-t2978952 by @xpirt so thanks to him
So in order to save myself and others who most port Custom & Stock Roms, i decided to use some part of my time to write this script for easy work done.
What this script does :
It basically Unpack and Repack system.new.dat alongside with file_context.bin convertion which is seen in android 7.0/7.1
ITS USAGE:
NOTE
First Clone the repo.
Make sure that Android_System_Extraction_and_Repack_Tool is located at Desktop
Run "Xtrakt" from it's location in terminal
Copy "file_contexts.bin" from your Rom to "file_context_zone" folder
Use "f" from menu to convert "file_contexts.bin" to text readable "file_contexts"
Copy : system.new.dat, system.transfer.list & file_contexts to "convert-dat" folder.
Use "i" from menu to unpack, which the output will be name as "rom_system" for modifications of apks & files.
Use "y" from menu to repack, which the complete new "system.new.dat", "system.patch.dat" & "system.transfer.list" will be located at "Finish-new.dat" folder
Done !
EXAMPLE:
Again , Make sure that Android_System_Extraction_and_Repack_Tool is located at Desktop
In your terminal, type the following to start the script:
Code:
git clone https://github.com/iykequame/Android_System_Extraction_and_Repack_Tool.git
mv android_system_extraction_and_repack_tool ~/Desktop/
cd ~/Desktop/android_system_extraction_and_repack_tool/
./Xtrakt
OR
Code:
Double-click the Xtrakt file and choose "Run in Terminal" if your OS supports it.
##ALERT!!!##
sudo is requested in the script.
How To Get It {Tool]
Clone from one of the below ;
From GITHUB :
Code:
git clone https://github.com/iykequame/Android_System_Extractrion_and_Repack_Tool.git
From BITBUCKET :
Code:
git clone https://[email protected]/zac6ix/android_system_extraction_and_repack_tool.git
Or
Download zip
AFH
GIT-RELEASE
Sources :
Android_System_Extraction_and_Repack_Tool
GITHUB
BITBUCKET
Threads :
sdat2img 1.0 - img2sdat 1.2
For file_context.bin conversion by: Pom Kritsada @ MTK THAI Developers.
Credit to :
@xpirt
@SuperR.
-all xda threads which helped
-Android Matrix Development - here
-Nana Yaa for her time.
hi, your tool sounds good but it seems it doesnt work.
i press f and nothing happen ..
Use "f" from menu to convert **"file_contexts.bin"** to text readable **"file_contexts"**
Blackball said:
hi, your tool sounds good but it seems it doesnt work.
i press f and nothing happen ..
Use "f" from menu to convert **"file_contexts.bin"** to text readable **"file_contexts"**
Click to expand...
Click to collapse
Sorry for the Late reply !
Directories linking has been fix .
You can go ahead and try again
Thanks for sharing!
Don't work
When i press i ..Don't work.say file missing.but i already put all file..Please help meView attachment 4249470
Doesn't do anything with file_context.bin, doesn't even check if file is there.
oreo supported???
I am getting this error on repacking:-
Code:
WARNING! WARNING!! WARNING!!!
Please Check & Trace Where Errors.
There Is NO rom_system found
file_contexts -->> Missing !
Android SDK -->> not detected !
Please help.
Black_J said:
I am getting this error on repacking:-
Code:
WARNING! WARNING!! WARNING!!!
Please Check & Trace Where Errors.
There Is NO rom_system found
file_contexts -->> Missing !
Android SDK -->> not detected !
Please help.
Click to expand...
Click to collapse
I see that this thread is not supported.
Anyways, I observed that the tool works for file_contexts.bin but not for other options.
So , I followed the other link in the thread for individual commands and was successful.
Works perfectly on Android Pie! Have to do some tweaks, PM me if anyone wants to make this work for Android Pie.
I have:
Downloaded the exact kernel version running on my device from an AOSP mirror (4.9.170) (https://github.com/aosp-mirror/kernel_common.git)
Downloaded the exact compiler used to compile the kernel from my device:
Ran `cat /proc/version`, which returns "Linaro GCC 5.3-2016.05", which I downloaded from https://releases.linaro.org/components/toolchain/binaries/5.3-2016.05/aarch64-linux-gnu/
Took the kernel configuration from `/proc/config.gz`, copied it to the kernel source directory `kernel_common` as `.config`
Ran `make ARCH=arm64 CROSS_COMPILE=xxx oldconfig`
What I'm seeing:
First, the downloaded kernel source for 4.9.170 seems to think that my `config` is incomplete, since it will prompt me to answer ~15 extra configuration questions.
Second, this old Linaro compiled doesn't appear to support `-fstack-protector-strong` despite it being explicitly enabled in the `/proc/config.gz` file. So I end up disabling it with `./scripts/config --disable CONFIG_CC_STACKPROTECTOR_STRONG`
Finally, after successfully compiling, I take `net/ipv4/tcp_westwood.ko`, just as a test module, and try to load it on my Android device, and it fails:
`insmod: failed to load tcp_westwood_5.ko: Exec format error`
And in dmesg output: `tcp_westwood: disagrees about version of symbol module_layout`
My questions:
Can I assume that the `/proc/config.gz` file is not the actual file used to compile the running kernel, considering it doesn't completely configure the 4.9.170 kernel?
Am I on the right path to getting a kernel module that my kernel will load?
Background information:
I'm hoping this isn't very relevant, but just to head off some questions
This is a T95 Android TV device running what appears to be, to this newbie's eyes, a very Frankenstein'd Android 10 install (See https://www.cnx-software.com/2020/0...-comes-with-mali-g31-gpu-supports-android-10/)
I can't find any official - or unofficial - source for this device, which is why I'm going to all the trouble above.
I really appreciate any help, thank you!