step by step modify android's ramdisk.img

cspyb

Step by step to create/modify ramdisk.img
Benno's blog has an article to
change the ramdisk image
, I tried it and give more details here.
ramdisk.img
is included in the google android sdk, it exists in folder
$SDK_ROOT/tools/lib/images/ramdisk.img. The ramdisk.img included in the
google android sdk is a gzipped ramdisk.cpio file.
Here is the steps:

Upload the ramdisk.img to your linux machine

Change the ramdisk.img name to ramdisk.cpio.gz, and extract it by: #  gzip -d ramdisk.cpio.gz

Create a temporary folder, say tmp, copy ramdisk.cpio to tmp folder

Extract the ramdisk.cpio in the tmp folder with command: #  cpio -i -F ramdisk.cpio

Remove the ramdisk.cpio in the tmp folder, and make any changes you want to the extracted ramdisk.cpio in tmp folder

Recreate the ramdisk.cpio with command: # cpio -i -t -F ../ramdisk.cpio | cpio -o -H newc -O ../ramdisk_new.cpioSome notes:

I
change ramdisk.img to ramdisk.cpio.gz, and unzip it. It is because I
find the -z parameter is not supported with my cpio. I tried the latest
cpio (2.9), it doesn't work too.

Check cpio version by # cpio --version. I'm using cpio version 2.4.

Find the latest cpio (v 2.9) on site:
gnu cpio

Notice that in step 6, the command includes two O's. First o is lower-case, second is up-case.

Notice in step 6, please remain ramdisk.cpio in up folder of tmp folder. The command need it there.
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