bmc-ami

Dump image

$ dumpimage -i FIRMWARE.IMA -o OUTPUT-DIRECTORY

Generate image

From the directory containing "genimage.ini" run:

$ genimage

u-Boot image

First check current flags:

$ mkimage -l ROOT.bin
Image Name:
Created:      Thu Dec  6 23:09:39 2012
Image Type:   SuperH Linux RAMDisk Image (uncompressed)
Data Size:    15495168 Bytes = 15132.00 kB = 14.78 MB
Load Address: 00000000
Entry Point:  00000000

To re-create u-Boot image (for SuperH arch use "sh"):

$ mkimage -A sh -O linux -T ramdisk -C none -d ROOT-new.cramfs ROOT-new.bin

Manage the MTD image

1. Expand extracted CONF.bin to the minimal erase block count (8 by 64k, maximum is around 1.5M):
   $ s=$(stat -c "%s" CONF.bin)
$ dd if=/dev/zero of=CONF.bin seek=$s bs=1 count=$((0x80000 - $s))
2. Associate /dev/loopX with CONF.bin via losetup:
   $ losetup /dev/loop0 CONF.bin
3. Associate /dev/loopX with MTD char device (erase size is 64k):
   $ modprobe block2mtd block2mtd=/dev/loop0,0x10000
4. Insmod MTDBLOCK module to mount image:
   $ modprobe mtdblock
$ mount -tjffs2 /dev/mtdblock0 MOUNT_POINT
5. Modify content on your own
6. Re-create MTD image:

$ mkfs.jffs2 -c 12 -l -f -s 0x800 -q -x lzo  --pad=0x00170000 -e 0x10000 -r MOUNT_POINT -o CONF-NEW.bin

7. Remove modules & deassociate loop-back device

$ rmmod mtdblock; rmmod block2mtd
$ losetup -d /dev/loop0