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CSM BIOS for EFI machines - success! (Announce)

posted by RayeR Homepage, CZ, 09.07.2025, 17:05

I'm not so optimistic, at least on this device.
With SeaVBIOS only very few programs can work in VESA modes - VMT, Heaven 7 demo and with intel VBIOS none.
With SeaVBIOS std VGA graphics don't work - doom, only with intel VBIOS but for some reason keyboard doesn't work during the game.
I still didn't solve how to properly configure intel VBIOS for built in LCD so I still need to attach ext. LCD via HDMI. I was digging around a lot but didn't find a never VBIOS than build 1014. On some intel forum thread I read, that Cherry View VBIOS was canceled and they dropped the support (probably intel management did some optimalisation of engineers allocation to not waste more time with legacy projects). So for newer platforms (intel IGP) there are no VBIOS at all and SeaVBIOS capabilities are very limited. In theory, if intel gives enough documentation and/or opensource linux driver one could write VBIOS initialization part and integrate it to SeaVBIOS but not easy task...

I tried SBEMU/VSBHDA but it didn't recognize the HDA audio device. I didn't try more, maybe adding of some PCI ID would be enough...

BTW the latest version of CSMWrap 1.3.0 added a feature that it can load alternative vbios from a file - no more need to recompile, if file is not found it would use vbios built in the uefi fw or seavbios if none.

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DOS gives me freedom to unlimited HW access.

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