[Bug 93281] Kernel modesetting causes the kernel to lock up during boot on a late 2011 MacBook Pro

[bugzilla-daemon at bugzilla.kernel.org]

https://bugzilla.kernel.org/show_bug.cgi?id=93281

--- Comment #14 from Alex Deucher <alexdeucher at gmail.com> ---
Macs apparently only make the vbios image available during the pre-OS EFI
environment.  Once the OS loads, the image is no longer available so the boot
loader needs to grab it and stash it somewhere so that the OS can access it
once it as taken over.

https://bugs.freedesktop.org/show_bug.cgi?id=26891

"As stated above, you cannot use grub to load the firmware as the information
is only accessible before you exit the boot services in EFI.  The kernel must
be booted using EFI stub booting (that's where the code for getting the bios
image is).  I use rEFInd as this now automaigcally passes the initramfs
location to the kernel."

Someone would probably need to port the relevant code from rEFInd for grub.

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