WIP: chromebook integration script

I intend to merge every Chromebook that Mrchromebox supports,
into Libreboot, ready for the Libreboot 25.12 release. Work
is still ongoing, and several changes need to happen in lbmk.

I started working on it a few weeks ago (today is
14 November 2025 as I push this).

Still TODO:

* Automatically create lbmk coreboot targets, based
  on the configs present in MrChromebox git
* Re-work git repository management in lbmk, such that
  a list of upstreams is used, instead of a hardcoded
  list per configuration; this will allow us to use
  different remotes across the same project, even where
  they diverge. This would then allow us to use the
  MrChromebook repository directly, instead of cherry-picking
  patches into upstream coreboot
* The note above about remotes would also mean that we can
  use MrChromebox's own edk2 repository directly. All of this
  would reduce the burden on lbmk.git
* Support building edk2 payloads, exactly mirroring the
  setups used on MrChromebox builds

There are some things that need to be checked first, for
boards that use MMC-based or eMMC-based storage, for the
GRUB and SeaBIOS payloads, also U-Boot, because I will
also be using these.

As such, this current script shall sit in lbmk master, but
it is not yet finished.

Signed-off-by: Leah Rowe <leah@libreboot.org>

mk

@@ -28,6 +28,7 @@ fi
 . "include/rom.sh"
 . "include/release.sh"
 . "include/get.sh"
+. "include/chromebook.sh"
 
 main()
 {
@@ -42,7 +43,7 @@ main()
 	version)
 		printf "%s\nWebsite: %s\n" "$relname" "$projectsite"
 		;;
-	release|download|inject)
+	release|download|inject|prep_mr_import)
 		$cmd "$@"
 		;;
 	-*)