修改Android boot.img

一 大概流程

1)  From running boot.img

 

- retrieve boot.img from device using dd on the LNX partition

- use umkbootimg to explode it

- unzip initramfs and then cpio to get the default.prop, init.rc, init.trace.rc, etc.

- change desired files

- use mkbootimg to rebuild a RENAMED bootXX.img

- adb reboot bootloader

- fastboot boot ./bootXX.img to load the image without writing to flash

- IF it comes up, check to make sure props and init is run okay ELSE powercycle to boot flashed boot.img

- Once the new image is soaked write the new image to flash: fastboot flash boot bootXX.img

 

2) From local build area

- GIT clone the android area

- change the desired files, 

- do a "make bootimage" to build boot.img

- save the running boot.img as above

- follow steps above to fastboot your private image, soak it and then flash it.

 

 用第一种流程。

 

二 具体流程

参考：

  http://www.imajeenyus.com/computer/20130301_android_tablet/android/unpack_repack_recovery_image.html

  http://android-dls.com/wiki/index.php?title=HOWTO:_Unpack%2C_Edit%2C_and_Re-Pack_Boot_Images#Background

  有照着这两篇的方法做。但我重新压缩出来的img是不对的。原img有14.5M，我重新打包后只有8M，fastboot flash进去无法启动。肯定有参数没有指定对。但具体的实现就是这样。

 

三 简单可行的方法

  用xda上提供的简单工具直接pack/unpack

  http://forum.xda-developers.com/showthread.php?t=2073775

  https://github.com/OrenHg/Android-Image-Kitchen/tree/AIK-Linux

  直接可用。