project's home page http://gitorious.org/ac100/abootimg

abootimg is a tool created by Gilles Grandou for manipulating Android Boot Images directly from the AC100 (Be carefull to not mess your bootimg otherwise you will need the free tool putusb or the proprietary NVidia's nvflash to flash again a bootable image). abootimg can work directly on block devices, or, the safest way, on a file image.

For further informations, read the README.

• reading current boot image

abootimg -i /dev/mmcblk0p2

here is the output for an AC100-114:

root@ac100:/tmp/bootimg# abootimg -i /dev/mmcblk0p2

Android Boot Image Info:

* file name = /dev/mmcblk0p2 [block device]

* image size = 8388608 bytes (8.00 MB)
  page size  = 2048 bytes

* Boot Name = "Ubuntu Boot Img"

* kernel size       = 3146584 bytes (3.00 MB)
  ramdisk size      = 2310081 bytes (2.20 MB)

* load addresses:
  kernel:       0x10008000
  ramdisk:      0x11000000
  tags:         0x10000100

* cmdline = mem=448M@0M tegrapart=recovery:300:a00:800,boot:d00:1000:800,mbr:1d00:200:800 root=UUID=xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx zcache debug verbose console=tty0 console=ttyGS0,115200n8 console-setup/layoutcode=fr console-setup/variantcode=oss locale=fr_FR

* id = 0x00000000 0x00000000 0x00000000 0x00000000 0x00000000 0x00000000 0x00000000 0x00000000

• extracting current bootable image

cd /tmp/bootimg
abootimg -x /dev/mmcblk0p2

here is the result and files extracted:

root@ac100:/tmp/bootimg# abootimg -x /dev/mmcblk0p2
writing boot image config in bootimg.cfg
extracting kernel in zImage
extracting ramdisk in initrd.img
root@ac100:/tmp/bootimg# ls -1
bootimg.cfg
initrd.img
zImage

• updating the kernel on a copy of the current bootable image

  dd if=/dev/mmcblk0p2 of=/tmp/part-6.img
  abootimg -u /tmp/part-6.img -k /boot/vmlinuz

Thank you very much for this great tools ggrandou!