README_Xperia

Configuration files can be found in arch/arm64/configs.

  defconfig using in common:
    sm8150-perf_defconfig

  diffconfigs for each product:
    Xperia XZn Hnnnn/Hnnnn => griffin_diffconfig
    Xperia XZn SO-nnX      => griffin_n_diffconfig
    Xperia XZn SOVnn       => griffin_k_diffconfig
    Xperia XZn nnnSO       => griffin_s_diffconfig
    Xperia XZn Hnnnn/Hnnnn => bahamut_diffconfig
    Xperia XZn SO-nnX      => bahamut_n_diffconfig
    Xperia XZn SOVnn       => bahamut_k_diffconfig
    Xperia XZn nnnSO       => bahamut_s_diffconfig
    Xperia XZn Hnnnn/Hnnnn => horus_diffconfig
    Xperia XZn Hnnnn/Hnnnn => sphinx_diffconfig

How to build your kernel:

  Prerequisites:

    * mkbootimg - boot.img generator
      Reference)
      https://android.googlesource.com/platform/system/core/+/master/mkbootimg/

    * dtc - Device Tree Compiler, called from make
      This tool can be available from AOSP prebuilts/misc repository.
      Reference)
      https://android.googlesource.com/platform/prebuilts/misc/+/master/linux-x86/dtc/

    * mkdtimg - dtbo.img generator
      This tool can be available from AOSP prebuilts/misc repository.
      Reference)
      https://android.googlesource.com/platform/prebuilts/misc/+/master/linux-x86/libufdt/

    * Qualcomm Snapdragon LLVM Compiler (clang)
      You can obtain SD clang from below URL. clang-6.0 based one will be better.
      Reference)
      https://developer.qualcomm.com/software/snapdragon-llvm-compiler-android

    * The ARM cross-compiler (gcc)
      The current build system is still depend on gcc related tools such as linker.
      Reference)
      https://android.googlesource.com/platform/prebuilts/gcc/linux-x86/aarch64/aarch64-linux-android-4.9/+/master

  Step 1: Build Your Kernel
    $ export PATH=<path-to-gcc-executables>:$PATH
      NOTE: Please set the location of the gcc cross-compiler.
    $ export PATH=<path-to-dtc-executables>:$PATH
      NOTE: Please set the location of dtc (in prebuilt/misc repository).
    $ export PATH=<path-to-mkdtimg-executables>:$PATH
      NOTE: Please set the location of mkdtimg (in prebuilt/misc repository).
    $ export KBUILD_DIFFCONFIG=griffin_diffconfig
      NOTE: Please set a configuration file you want to build.

    $ cd kernel/msm-4.14
    $ make O=../../out CONFIG_BUILD_ARM64_DT_OVERLAY=y ARCH=arm64 DTC_EXT=dtc \
           CROSS_COMPILE=aarch64-linux-android- REAL_CC=<full-path-to-sdclang-6.0>/clang \
           CLANG_TRIPLE=aarch64-linux-gnu- vendor/sm8150-perf_defconfig
    $ make O=../../out CONFIG_BUILD_ARM64_DT_OVERLAY=y ARCH=arm64 DTC_EXT=dtc \
           CROSS_COMPILE=aarch64-linux-android- REAL_CC=<full-path-to-sdclang-6.0>/clang \
           CLANG_TRIPLE=aarch64-linux-gnu- -j12
    $ cd ../..

    You can see out/arch/arm64/boot/Image-dtb if you succeed in building kernel.
      NOTE: Since this sm8150 based products, the kernel image doesn't compress with gzip because of performance matter.

  Step 2: Assembling the boot.img
    $ mkbootimg \
        --kernel out/arch/arm64/boot/Image-dtb \
        --cmdline "androidboot.hardware=qcom androidboot.memcg=1 \
                   lpm_levels.sleep_disabled=1 video=vfb:640x400,bpp=32,memsize=3072000 \
                   msm_rtb.filter=0x237 service_locator.enable=1 swiotlb=2048 \
                   firmware_class.path=/vendor/firmware_mnt/image loop.max_part=7 \
                   androidboot.usbcontroller=a600000.dwc3 panic_on_err=1 \
                   printk.devkmsg=on buildvariant=userdebug" \
        --base 0x00000000 \
        --pagesize 4096 \
        --os_version 9 \
        --os_patch_level 2018-08-05 \
        --header_version 1 \
        --output out/boot.img

      NOTE: Since Android O, you need to set 'os_version' and 'os_patch_level'
            parameters for mkbootimg according to your base Android system image.

  Step 3: Assembling the dtbo.img
    $ mkdtimg create out/dtbo.img --page_size=4096 `find out/arch/arm64/boot/dts -name "*.dtbo"`