custom roms - Unpack initramfs.cpio.gz (boot.img) from MTK6589 phone?

I can't find a proper tool to unpack boot.img from GravityMod2.

both unmkbootimg and split_bootimg.pl are able to extract same fileset (kernel, 4280320 bytes and ramdisk, 633284 bytes). I think the files are damaged (taken from wrong offsets?) - can't even find gzip/cpio signatures in ramdisk image!

Is there another specific tool to unpack Android 4.2.x boot.img, or MTK-specific tool maybe?

Answer

You can find proper tools to unpack boot, recovery, system and data images here: mtk-tools

Thread of the author on xda developers, thank him :)

Usage:

./unpack-MT65xx.pl boot.img
./repack-MT65xx.pl -boot   boot.img