Having worked on the Samsung chromebook firmware I second this, you can configure the chromium-os build system to cross compile any piece of the software/firmwa

Having worked on the Samsung chromebook firmware I second this, you can configure the chromium-os build system to cross compile any piece of the software/firmware stack (or to use a prebuilt package) and most deving was done this way. If it is at all an option, check out the chroot and build system of chromium-os and see if you can import your toolchain packages, the environment should be strait forward to extend wih your own custom dependancies.