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| author | Lanchon <lanchon@gmail.com> | 2016-01-12 02:44:18 -0300 |
|---|---|---|
| committer | Caio Schnepper <caioschnepper@gmail.com> | 2016-01-18 16:12:13 -0800 |
| commit | daa49a63ced8e1a3f7e2ddc94cd04fadd4bd0d80 (patch) | |
| tree | b1e68f0b90323f75cef0e1e3be7636fa0aadd480 | |
| parent | 0fc62e6cd3d3f5d56b50adebd3153e00ddcf5bac (diff) | |
| download | kernel_samsung_smdk4412-daa49a63ced8e1a3f7e2ddc94cd04fadd4bd0d80.zip kernel_samsung_smdk4412-daa49a63ced8e1a3f7e2ddc94cd04fadd4bd0d80.tar.gz kernel_samsung_smdk4412-daa49a63ced8e1a3f7e2ddc94cd04fadd4bd0d80.tar.bz2 | |
IsoRec: Isolated Recovery for the Exynos 4210 family
IsoRec aims to be a standard by which the monolithic kernel/recovery binaries
of the S2 family of devices can invoke an alternate recovery optionally flashed
separately by the user.
The alternate recovery is flashed to the RECOVERY partition (/dev/block/mmcblk0p6),
a seemingly vestigial partition without any real use. Only the lzop-compressed,
cpio-formatted recovery ramdrive is stored there; the standard kernel image is
used to run this recovery. The lzop-compressed image of the ramdrive is stored
raw in the RECOVERY partition.
Behavior of patch:
-skip all this if not booting into recovery.
-if the raw recovery partition contains valid lzop-compressed data,
-and if said data is a valid cpio archive,
-then use that cpio archive as the recovery ramdrive;
-else use the default recovery ramdrive bundled with the kernel.
More information here:
http://forum.xda-developers.com/galaxy-s2/orig-development/isorec-isolated-recovery-galaxy-s2-t3291176
Change-Id: I2fa1b764b52915262374124ea28f5a2585314891
| -rwxr-xr-x | usr/galaxys2_initramfs_files/init | 20 |
1 files changed, 18 insertions, 2 deletions
diff --git a/usr/galaxys2_initramfs_files/init b/usr/galaxys2_initramfs_files/init index 32eacfb..cb3da8e 100755 --- a/usr/galaxys2_initramfs_files/init +++ b/usr/galaxys2_initramfs_files/init @@ -12,8 +12,24 @@ busybox mount -t sysfs sysfs /sys load_image=/stage1/boot.cpio if busybox grep -q bootmode=2 /proc/cmdline ; then - # recovery boot - load_image=/stage1/recovery.cpio + + # recovery boot + + # default to recovery ramdisk bundled with kernel + load_image=/stage1/recovery.cpio + + # attempt isorec (isolated recovery) boot + + # if the raw /dev/block/platform/dw_mmc/by-name/RECOVERY + # partition contains valid lzop-compressed data + if busybox lzop -dc /dev/block/mmcblk0p6 > /stage1/isorec.cpio ; then + # and if said data is a valid cpio archive + if busybox cpio -t < /stage1/isorec.cpio ; then + # then use it as the recovery ramdisk + load_image=/stage1/isorec.cpio + fi + fi + fi busybox cpio -i < ${load_image} |