Re: [PATCH] radeon: acquire BIOS via firmware subsystem if everything else failed

On Tue, Nov 25, 2014 at 12:14:21PM -0500, Alex Deucher wrote:

The vbios image is available via ACPI prior to the OS taking over. IIRC, Matthew Garret fixed up the bootloader to fetch the vbios image prior to loading Linux so that it could be accessed after the OS loaded.

EFI rather than ACPI, but yeah. In theory this should work fine if you're using the EFI entry point. I don't know whether the patches for linuxefi were ever accepted by grub upstream - if not, pushing those would make more sense.