photon-dev-team/ics_kernel — Issue #2: No EXT4 Support In Kernel
Author: jasonherald
Created: 2012-02-02 02:41:01+00:00
State: open

I hope this helps:

I added the ext4 flags (See Below) to the kernel config to support the make otapackage for the aosp build (master).
-- The default updater script that is generated has the following lines:
format("ext4", "EMMC", "/dev/block/mmcblk0p12", "0");
mount("ext4", "EMMC", "/dev/block/mmcblk0p12", "/system");

Without kernel ext4 support the /system directory will not be mounted on boot making the system hang at the M and providing the error "/system/bin/sh cannot be found" if you try to run adb commands.

Flags:
CONFIG_EXT4_FS=y
CONFIG_EXT4_FS_XATTR=y