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CSM BIOS for EFI machines - success! (Announce)

posted by Zyzzle, 07.07.2025, 02:43

> A small milestone - Doom can run on UEFI class 3 (legacy free) netbook:
> http://rayer.g6.cz/1tmp/csmwdoom.jpg
> VGA compatability was a bit improved as SeaBIOS VBE ROM was replaced by
> original intel Cherry View VBIOS dumped from another UEFI FW. But there are
> still lot of issues. It shown, that dumped VBIOS contains some HW specific
> block ($VBT) thats unable to run on built-in netbook LCD but only external
> LCD via microHDMI. VGA compatability is better but broken another way. Doom
> lost keyboard control as probably KBD handler gets overwriten by DOS/4GW or
> Doom one. And any attempt to call VESA VBE cause hang so in this case it's
> worse than SeaBIOS VBE. But I hope it could be resolved...
 Did you get VESA VBE running at resolutions of 640x480x8 or above in the same netbook with SeaBIOS on the same legacy-free netbook? How about SBEmu and / or VSBHDI?

This is a huge milestone, another "impossible" feat accomplished. Hopefully the project will continue to improve and various patched VBIOSes can address the problems you've seen. It seems like a whole world opening with the "cracking" of UEFI on non-BIOS systems, a substantial and important step at preserving legacy DOS on castrated post-2020 UEFI systems.

My experiments have been less successful. Have not got this working yet on my single non-legacy UEFI laptop.

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