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A lot of firmware supports using CSM to do GPU init and then providing UEFI interfaces on top of that. Of course, this is incompatible with Secure Boot.
by mjg59 5y ago
A lot of firmware supports using CSM to do GPU init and then providing UEFI interfaces on top of that. Of course, this is incompatible with Secure Boot.
- yuhong 5y agoIn fact, you can't really run any other legacy option ROMs without legacy VGA support. You can run legacy SAS option ROMs for example and still do UEFI boot because of similar support for Int13, but to even run them require VGA text mode to be working.