README_Xperia

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

  defconfig using in common:
    sdm660-perf_defconfig

  diffconfigs for each product:
    Xperia 10       => kirin_diffconfig
    Xperia 10 Plus  => mermaid_diffconfig


How to build your kernel:

  Prerequisites:

    * ramdisk.img - root fs

    * mkbootimg - boot.img generator

    * The ARM cross-compiler
      You can use prebuild executable binary which is included in
      standard Android repository. Please visit to external site.
      In case of this platform, we recommend to use gcc 4.9 or later
      such as aarch64-linux-android-4.9 to avoid known issues.


  Step 1: Build Your Kernel
    $ cd kernel/msm-4.4

    $ export ARCH=arm64

    $ export PATH=<path-to-cross-compiler-executables>:$PATH
      NOTE: Please set the location of the ARM cross-compiler.

    $ export CROSS_COMPILE=<toolchain-prefix>
      NOTE: Please set the prefix of the ARM cross-compiler.
            ex) aarch64-linux-android-

    $ export KBUILD_DIFFCONFIG=kirin_diffconfig
      NOTE: Please set a configuration file you want to build.

    $ make sdm660-perf_defconfig O=./out ARCH=arm64 

    $ make O=./out

    You can see arch/arm64/boot/Image.gz-dtb if you succeed in building.


  Step 2: Assembling the boot.img
    (In the Linux Kernel directory)
    $ mkbootimg \
      --kernel out/arch/arm64/boot/Image.gz-dtb \
      --ramdisk ramdisk-recovery.img \
      --cmdline "androidboot.hardware=qcom user_debug=31 msm_rtb.filter=0x37 ehci-hcd.park=3 lpm_levels.sleep_disabled=1 sched_enable_hmp=1 sched_enable_power_aware=1 service_locator.enable=1 swiotlb=1 firmware_class.path=/vendor/firmware_mnt/image loop.max_part=7 panic_on_err=1 loop.max_part=7 buildvariant=userdebug veritykeyid=id:$(openssl x509 -in verity_dev_keys.x509 -text | grep keyid | sed 's/://g' | tr -d '[:space:]' | tr '[:upper:]' '[:lower:]' | sed 's/keyid//g')" \
      --base 0x00000000 \
      --pagesize 4096 \
      --os_version 9 \
      --os_patch_level 2019-02-01 \
      --header_version 1 \
      --output boot.img