I am a bit confused by one of the comment in
MdeModulePkg/Universal/Console/GraphicsConsoleDxe/GraphicsConsole.c.
The comment at line 480
(https://github.com/tianocore/edk2/blob/master/MdeModulePkg/Universal/Consol
e/GraphicsConsoleDxe/GraphicsConsole.c#L480) is:
//
// if not supporting current mode, try 800x600 which is required by
UEFI/EFI spec
//
Status = CheckModeSupported (
Private->GraphicsOutput,
800,
600,
&ModeNumber
);
I can see a requirement on 80x25 in 11.4 Simple Text Output Protocol but I
have not found the requirement on 800 x 600.
I might have done a search on the wrong keywords (I tried '600' and VGA).
There is a similar comment at line 527
(https://github.com/tianocore/edk2/blob/master/MdeModulePkg/Universal/Consol
e/GraphicsConsoleDxe/GraphicsConsole.c#L527).
If the comments are wrong then 800x600 should maybe be replaced by PcdGet32
(PcdVideoHorizontalResolution)x PcdGet32 (PcdVideoVerticalResolution).
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