From what has been seen, all Chromebooks (from Google and other vendors)run the open source "Coreboot" BIOS, which they allow to be user-flashable Beyond that,

From what has been seen, all Chromebooks (from Google and other vendors)run the open source "Coreboot" BIOS, which they allow to be user-flashable Beyond that, they seem to mandate a strict policy of no binary blobs, and code seems to get merged into the mainline kernel pretty quickly My Chromebook 13 worked OOTB with Linux after I flashed the BIOS. The only piece of hardware that didn't work was the keyboard backlight control, which was added in Kernel 4.9