In fact, as reported by Phoronix colleagues, Corebook has recently been updated to version 4.17 which, in addition to supporting new cards mothers, offer a new bootloader compatible with AMD Platform Secure Boot (PSB) and fix several bugs, is equipped with a port of DOOM.
Recall that Coreboot is an open source implementation of a BIOS and supports several extensions known as Payloads, which add more functionality than the basic ones. In this case, the DOOM port for Coreboot was implemented through the Payload called CoreDoom, adding to Grub Invaders (Space Invaders clone) and Tint (Tetris replica), taking BIOS gaming to a new level with a 3D game.
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In case you are interested, you can visit the official website to check if your motherboard supports Corebook (we can also find several Chromebooks in the list) and if necessary, download the necessary files.