Various initramfs images for Chrome OS: recovery, factory, etc...

Clone this repo:
  1. 093fd2c factory_netboot: Apply new factory resources. by Hung-Te Lin · 7 weeks ago firmware-nami-10775.B master release-R68-10718.B stabilize-10682.B stabilize-atlas.10736.B stabilize-nocturne.10736.B
  2. e7d2404 factory_netboot: Add missing storage-info-common.sh. by Hung-Te Lin · 9 weeks ago stabilize-nocturne.10646.B
  3. 9dd91bb recovery: Restrict autoscaling to displays with X resolution >= 1920 by Matthias Kaehlcke · 3 months ago release-R67-10575.B stabilize-10569.B stabilize-10575.54.B stabilize-meowth-10574.B
  4. 6825ff7 factory_shim: Move patching for new rootfs into factory_bootstrap.sh. by Hung-Te Lin · 3 months ago
  5. 7d9dd16 README.md: Add more debug information. by Hung-Te Lin · 3 months ago

Chromium OS initramfs

Build logic for creating standalone initramfs environments.

See the README files in the respective subdirs for more details.

To Use

Normally you wouldn't build in this directory directly. Instead, you would build the chromeos-initramfs package with the right USE flags. e.g.:

$ USE=recovery_ramfs emerge-$BOARD chromeos-initramfs

That will install the cpio initramfs files into the sysroot for you to build into a kernel directly. The various build scripts would then be used to make the right kernel/image using those (e.g. mod_image_for_recovery.sh).

To Make

You could build these by hand for quick testing. Inside the chroot:

$ make SYSROOT=/build/$BOARD BOARD=$BOARD <target>

That will create the cpio archives for you.

To Debug

It is possible to debug few of the initramfs targets in QEMU. Read test/README.md for more information.

Also, here is a shortcut for developing/debugging graphical bits in initramfs, without having to create a full image for every iteration.

After emerge-$BOARD, find your initramfs package from chroot /build/$BOARD/var/lib/initramfs and copy to a running DUT, for example /tmp/recovery_ramfs.cpio.xz, then do followings on DUT:

  1. mount -o remount,exec /mnt/stateful_partition
  2. mkdir /mnt/stateful_partition/test; cd /mnt/stateful_partition/test
  3. xzcat /tmp/XXXXXX_ramfs.cpio.xz | cpio -iv
  4. stop ui; kill $(pidof frecon)
  5. bind mount /dev, /proc, /sys and /tmp in /mnt/stateful_partition/test
  6. chroot /mnt/stateful_partition/test/init
  7. Iterate.