Re: [PATCH 0/5] gfx: improvements when using multiboot2 and EFI + misc

[Marek Marczykowski-Górecki <marmarek@xxxxxxxxxxxxxxxxxxxxxx>]

On Wed, Nov 23, 2022 at 04:45:19PM +0100, Roger Pau Monne wrote:
> Marek: after this series using console= without the vga option should
> result in Xen not attempting to touch the selected GOP mode and the
> screen not getting cleared.

Thanks, this seems to work mostly fine.
There is one message printed from setup_efi_pci(): ... ROM ... bytes at ...
I'm not sure what to do about this one (although for Qubes, I can simply
patch it out ;) ).

But to get dom0 display image from BGRT, it seems something else is
needed too. Linux complains "Incorrect checksum in table [BGRT]". The
only relevant google result I get is this: 
https://support.citrix.com/article/CTX460227/citrix-hypervisor-acpi-warning-incorrect-checksum-in-table-bgrt
It blames firmware. But then, it's suspicious that it's also about Xen.
And also, native Linux on the same hw does not complain about the
checksum. So, I think it's rather Xen to blame...
The table lives in area marked as EfiACPIReclaimMemory in memory map, so
I think it shouldn't be clobbered by Xen, at least in theory. I'll look
into it later. It's getting off-topic for this thread anyway.

-- 
Best Regards,
Marek Marczykowski-Górecki
Invisible Things Lab

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