Hi!
CSMWrap is a cool little hack that brings back the good old PC BIOS on
those fancy-pants UEFI-only systems. It utilises the CSM
(Compatibility Support Module) and VESA VBIOS from SeaBIOS project to
emulate a legacy BIOS environment.
https://github.com/FlyGoat/csmwrap
I read the comments in the hacker news thread.
https://news.ycombinator.com/item?id=44101828
Two "gotchas" were mentioned:
1) Modern GPUs may not act enough like an IBM VGA for a generic VGA
VBIOS to work.
2) CSMWrap must be installed in a GPT partition. In theory a hybrid
GPT/MBR setup is possible, it will not reliably boot.
We've found several UEFI implementations will not consider a disk
bootable if the pMBR doesn't exactly match the spec, which
specifies that the 'protective' partition shouldn't be marked as
bootable in the MBR partition table.
Meanwhile, other implementations will not consider the disk
bootable in BIOS mode if the partition in the pMBR is not marked
bootable.
There is a thread about the idea on BTTR, also mentioning other CSM:
https://www.bttr-software.de/forum/board_entry.php?id=22628&page=0&order=time&category=0
https://ibb.co/ymw4GsDn
https://www.youtube.com/watch?v=G7qm3GFy9tg
Cheers, Eric
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