Call for Testing: UEFI Changes

[Kyle Evans]

On Wed, Mar 21, 2018 at 7:45 PM, Kyle Evans <kevans at freebsd.org> wrote:
> Hello!
>
> A number of changes have gone in recently pertaining to UEFI booting
> and UEFI runtime services. The changes with the most damaging
> potential are:
>
> We now put UEFI runtime services into virtual address mode, fixing
> runtime services with U-Boot/UEFI as well as the firmware
> implementation in many Lenovos. The previously observed behavior was a
> kernel panic upon invocation of efibootmgr/efivar, or a kernel panic
> just loading efirt.ko or compiling EFIRT into the kernel.
>
> Graphics mode selection is now done differently to avoid regression
> caused by r327058 while still achieving the same effect. The observed
> regression was that the kernel would usually end up drawing
> incorrectly at the old resolution on a subset of the screen, due to
> incorrect framebuffer information.
>
> Explicit testing of these changes, the latest of which happened in
> r331326, and any feedback from this testing would be greatly
> appreciated. Testing should be done with either `options EFIRT` in
> your kernel config or efirt.ko loaded along with updated bootloader
> bits.
>
> I otherwise plan to MFC commits involved with the above-mentioned
> changes by sometime in the first week of April, likely no earlier than
> two (2) weeks from now on April 4th.
>
> Thanks,
>
> Kyle Evans

As partially promised, the non-graphics related changes have been
MFC'd to stable/11 today as r332028.

The graphics related changes are going to simmer longer and probably
get ripped out, because we're bad at this.

Thanks,

Kyle Evans