[HOW TO] compile lge_star_kernel for cm7

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this thread is a short how to compile lge_star_kernel for cm7. as i am a noobie, if there is mistake, wrong, etc. please correct me.

there is cm kernel how to at http://wiki.cyanogenmod.com/wiki/Bui...el_from_source. i will make a few change from there for p990 (shown in bold)
benee in vorkKernel project posted how to compile vorkKernel at https://github.com/VorkTeam/vorkKernel-Scripts/wiki
git tutorial at http://gitref.org/creating/
lge-kernel-star is at http://github.com/CyanogenMod/lge-kernel-star/

# how to #

0. install required development support package : (see cm kernel how to)
0. assuming that cm rom source in ~/android/system and kernel source in ~/android/kernel for 1A and 1B or ~/android/system/kernel for 1C

1A. download kernel source : (first time only. you can use git for deltas only. see post #4 and follow step 1B instead)
> mkdir -p ~/android/kernel
> cd ~/android/kernel
> git clone git://github.com/CyanogenMod/lge-kernel-star.git
> cd lge-kernel-star

1B. update kernel source by git for new commits
> cd ~/android/kernel/lge-kernel-star
> git pull

1C. alternatively, set up git for cm repo
> cp local_manifest.xml ~/android/system/.repo/local_manifest.xml
> cd ~/android/system
> repo sync -j16 kernel/lge-kernel-star
> cd ~/android/system/kernel/lge-kernel-star

2. set up compiler prefix : we need "ARM EABI Toolchain" from prebuilt/linux-x86/toolchain/arm-eabi-4.4.0/bin/ in CM ROM source tree (4.4.3 also works, and i'm using it)
> export CCOMPILER=${HOME}/android/system/prebuilt/linux-x86/toolchain/arm-eabi-4.4.3/bin/arm-eabi-

3. copy config
> cp arch/arm/configs/star_cyanogenmod_defconfig .config

4. run configuration
> make ARCH=arm CROSS_COMPILE=$CCOMPILER oldconfig

5. build
> make ARCH=arm CROSS_COMPILE=$CCOMPILER -j`grep 'processor' /proc/cpuinfo | wc -l`

6. copy kernel and modules to cm source device folder (zImage is renamed as kernel)
> cp arch/arm/boot/zImage ~/android/system/device/lge/p990/kernel
> cp drivers/net/wireless/bcm4329/wireless.ko ~/android/system/device/lge/p990/prebuilt/wireless.ko

7. build CM ROM using the compiled kernel and modules

p.s. i use a bash script that does 2 to 6 automatically.

kernel source mod

# version : the current versioning that shows up in Settings > About phone > kernel version is a bit hard to follow if everybody compiles his/her own kernel. i customize lge-kernel-star/scripts/mkcompile_h and use date as version

46: DATETODAY=`date +"%Y%m%d"`
47: UTS_VERSION="$DATETODAY#$VERSION"

# compiled by : since i have a different username on linux system that i use, force it to show the name you want on it.

67: echo \#define LINUX_COMPILE_BY \"YOUR_NAME\"
68: echo \#define LINUX_COMPILE_HOST \"YOUR_MACHINE\"

here is my (simplified) shell script to compile kernel

#!/bin/sh
export CCOMPILER=${HOME}/android/system/prebuilt/linux-x86/toolchain/arm-eabi-4.4.3/bin/arm-eabi-
cd ${HOME}/android/kernel/lge-kernel-star || exit
${CCOMPILER}gcc --verbose || exit # show the cross compiler
\cp arch/arm/configs/star_cyanogenmod_defconfig .config
make ARCH=arm CROSS_COMPILE=$CCOMPILER oldconfig 
make ARCH=arm CROSS_COMPILE=$CCOMPILER -j`grep 'processor' /proc/cpuinfo | wc -l`

edit: added a printout of manual checking of compiler in line 4

Following is from myfluxi

Originally Posted by myfluxi

Hey, it's me again. Regarding the kernel thread, cloning the kernel ressources is not very efficient, instead add the git to your repository and just download deltas. Edit (typically) ~/android/.repo/local_manifest.xml by adding:

Code:

<project path="kernel/lge-kernel-star" name="CyanogenMod/lge-kernel-star.git" remote="github" revision="android-tegra-2.6.32" />

And a late happy birthday...

Cheers
Marc

Thanks for sharing. I suppose that's the next fun thing to learn.

Oh btw how do u add/remove kernel or init.rc commits?

Exactly what I looked for the other day. Thanks a lot pastime1971!!
This time I won't fail ;)

EDIT: but I did... I guess it's the export that made me fail?

sibbor@ubuntu:~/android/kernel/lge-kernel-star$ make ARCH=arm CROSS_COMPILE=$CCOMPILER -j`grep 'processor' /proc/cpuinfo | wc -l`
scripts/kconfig/conf -s arch/arm/Kconfig
  CHK     include/linux/version.h
  SYMLINK include/asm -> include/asm-arm
make[1]: `include/asm-arm/mach-types.h' is up to date.
  CHK     include/linux/utsrelease.h
  CC      scripts/mod/empty.o
cc1: error: unrecognized command line option "-mlittle-endian"
cc1: error: unrecognized command line option "-mapcs"
cc1: error: unrecognized command line option "-mno-sched-prolog"
cc1: error: unrecognized command line option "-mno-thumb-interwork"
scripts/mod/empty.c:1:0: error: unknown ABI (aapcs-linux) for -mabi= switch
scripts/mod/empty.c:1:0: error: bad value (armv5t) for -march= switch
make[2]: *** [scripts/mod/empty.o] Error 1
make[1]: *** [scripts/mod] Error 2
make: *** [scripts] Error 2

Originally Posted by temasek

Thanks for sharing. I suppose that's the next fun thing to learn.

Oh btw how do u add/remove kernel or init.rc commits?

the way i understand it is that boot.img is built w/ kernel (as prebuilt) and init ram disk when you brunch.
there are several init.rc involved. (see out/target/product/p990/root/)
for example w/ secure clock commit, init.p990.rc is from device/lge/p990/init.p990.rc

so, i build (brunch) cyanogen w/ kernel (zImage goes to device/lge/p990/kernel and modules go to device/lge/p990/prebuilt/) compiled as above and init.rc's changed in cm (you could cherry pick them, i suppose)

for kernel itself, i don't know if you can cherry pick them or not. typically, i just apply diff patches. (if someone know how to cherry pick kernel commits, please let us know.)

Originally Posted by pastime1971

the way i understand it is that boot.img is built w/ kernel (as prebuilt) and init ram disk when you brunch.
there are several init.rc involved. (see out/target/product/p990/root/)
for example w/ secure clock commit, init.p990.rc is from device/lge/p990/init.p990.rc

so, i build (brunch) cyanogen w/ kernel (zImage goes to device/lge/p990/kernel and modules go to device/lge/p990/prebuilt/) compiled as above and init.rc's changed in cm (you could cherry pick them, i suppose)

for kernel itself, i don't know if you can cherry pick them or not. typically, i just apply diff patches. (if someone know how to cherry pick kernel commits, please let us know.)

Thanks.

I'll have a go and it when I'm free. Good to have u onboard.

Originally Posted by sibbor

Exactly what I looked for the other day. Thanks a lot pastime1971!!
This time I won't fail ;)

EDIT: but I did... I guess it's the export that made me fail?

can you "echo $CCOMPILER" or "env | grep CCOMPILER" before make to ensure that it is exported correctly ?
it re-defines to use those arm-eabi-gcc and others. see lge-kernel-star/Makefile, line 309 : CC = $(CROSS_COMPILE)gcc
without it, you would be calling gcc which doesn't understand -mlittle-endian or other options in that log

edit: i commented out the line of export from my shell script, and i get the exact same error message. it must be export issue.

edit: you should get the following when you do "${CCOMPILER}gcc --verbose"

> ${CCOMPILER}gcc --verbose
Using built-in specs.
Target: arm-eabi
Configured with: /home/jingyu/projects/gcc/android-toolchainsrc/build/../gcc/gcc-4.4.3/configure --prefix=/usr/local --target=arm-eabi --host=x86_64-linux-gnu --build=x86_64-linux-gnu --with-gnu-as --with-gnu-ld --enable-languages=c,c++ --with-gmp=/home/jingyu/projects/gcc/toolchain_build/gingerbreadobj/temp-install --with-mpfr=/home/jingyu/projects/gcc/toolchain_build/gingerbreadobj/temp-install --disable-libssp --enable-threads --disable-nls --disable-libmudflap --disable-libgomp --disable-libstdc__-v3 --disable-sjlj-exceptions --disable-shared --disable-tls --with-float=soft --with-fpu=vfp --with-arch=armv5te --enable-target-optspace --with-abi=aapcs --with-gcc-version=4.4.3 --with-binutils-version=2.19 --with-gmp-version=4.2.4 --with-mpfr-version=2.4.1 --with-gdb-version=7.1.x --with-arch=armv5te --with-multilib-list=mandroid --with-sysroot=/usr/local/google/home/android/cupcake_rel_root --enable-gold=both/gold --program-transform-name='s&^&arm-eabi-&'
Thread model: single

Originally Posted by myfluxi

Hey,

if you just want to be on top of things of our beloved lge-kernel-star, maybe just:

git clone git://github.com/CyanogenMod/lge-kernel-star.git

and then sync with

cd lge-kernel-star
git [pull | fetch]

What do you think?

Cheers
Marc

thanks for your advice. i updated the first post accordingly.

edit: w/ today's commit, i tried "git fetch", and nothing happens. tried "git pull" and it downloads new commits. updated the first post. comment welcome if you know the difference between fetch and pull.