Build msm kernel for bullhead fails

[Yu-Chih Tung]

Guys, I am building kernel for Nexus 5x, but it fails and the resource of doing it is scarce.

Here is what I do

1. Mainly follow the guid in https://source.android.com/source/building-kernels.html, but I need make few changes to proceed....
2. I checkout the branch 

   origin/android-msm-bullhead-3.10-marshmallow-mr1

3. I use the prebuild toolchain in my AOSP folder, which is "aosp/prebuilts/gcc/linux-x86/arm/arm-eabi-4.8/bin"

4. So I set the following

• export ARCH=arm64

  export SUBARCH=arm64

  export CROSS_COMPILE=home/Android/aosp/prebuilts/gcc/linux-x86/arm/arm-eabi-4.8/bin/arm-eabi-

  export PATH=home/Android/aosp/prebuilts/gcc/linux-x86/arm/arm-eabi-4.8/bin:$PATH

• export CROSS_COMPILE=arm-eabi-
  

5. make bullhead_defconfig is ok
6. make fails....: (
• error: 

  arm-eabi-gcc: error: unrecognized command line option '-mgeneral-regs-only'

My guess is I set it to use a wrong toolchain or wrong target. However, I have tried many different options but with no luck. For example, I have tried different msm branch, different toolchian version (4.6~4.8), and set different ARCH. ARCH seems must be set as arm64, otherwise, I can't set make bullhead_defconfig. Does anyone have any thought? Any suggestion will be very welcome.

[DR]

I have same issue. I have tried with different toolchain(arm-eabi-4.6, arm-eabi-4.8, arm-linux-androideabi-4.9) but results was same.

can anyone give help quickly?

[bechts...@gmail.com]

Building ARM64 kernels requires an aarch64 toolchain. Following config should work with vanilla AOSP sync:

  export PATH=<your_aosp_root>/prebuilts/gcc/linux-x86/aarch64/aarch64-linux-android-4.9/bin:$PATH

  export ARCH=arm64

  export CROSS_COMPILE=aarch64-linux-android-

[류대희(Dae-Hee Ryoo)]

thanks. working well..

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