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

Clone this repo:
  1. dbab23e initramfs: init: disable setting up oobe_config keys by Amin Hassani · 13 days ago factory-grunt-11164.B master release-R71-11151.B stabilize-atlas-11177.B
  2. 56404ff recovery: Render OOBE auto-config enrollment domain by Tudor Brindus · 5 weeks ago stabilize-11101.B
  3. 3b7ff99 recovery: Build monospace glyphs in make_images by Tudor Brindus · 5 weeks ago
  4. 1198497 recovery: Write OOBE auto-setup signing data to TPM by Tudor Brindus · 5 weeks ago
  5. fa8eb49 recovery: improve docs by Mike Frysinger · 9 weeks ago factory-nocturne-11066.B firmware-grunt-11031.B firmware-servo-11011.B release-R70-11021.B stabilize-11005.B stabilize-11020.B stabilize-atlas-11022.B stabilize-jetstream-11056.B

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.