Nexus5 boot.img生成

Nexus 5 boot.img生成 メモ
Ubuntu 14.04 LTS 32bit(Virtualbox上)
Cross Compiler linaro-4.7.2

http://marcin.jabrzyk.eu/posts/2014/05/building-and-booting-nexus-5-kernel

$ cd /opt/kernel
$ git clone https://android.googlesource.com/kernel/msm.git

$ cd msm
$ git branch -a
$ git checkout origin/android-msm-hammerhead-3.4-kitkat-mr2

GCC4.7だとエラー吐く
https://gitorious.org/shr/linux/commit/a8444fa9d19403e5ee88ab6c1a34ce377a2cbc4b
ここに習って
/arch/arm/boot/compressed/Makefile
を修正

$ export ARCH=arm
$ export SUBARCH=arm
$ export CROSS_COMPILE=$CC72
$ make hammerhead_defconfig
$ make menuconfig
※とりあえず素のまま
$ make -j4

/arch/arm/boot/Image
/arch/arm/boot/zImage
/arch/arm/boot/zImage-dtb
無事に生成

split_bootimg.pl等でFactory Imageのboot.img展開してramdisk入手

boot.img生成コマンド
mkbootimg --base 0 --pagesize 2048 --kernel_offset 0x00008000 --ramdisk_offset 0x02900000 --second_offset 0x00f00000 --tags_offset 0x02700000 --cmdline 'console=ttyHSL0,115200,n8 androidboot.hardware=hammerhead  user_debug=31 maxcpus=2 msm_watchdog_v2.enable=1' --kernel zImage-dtb --ramdisk ramdisk.cpio.gz -o boot.img