Re: EFI Graphics

[Jordan Justen]

2011/11/9 Phillip Susi <address@hidden>:
> On 11/9/2011 3:52 AM, Vladimir 'φ-coder/phcoder' Serbinenko wrote:
>>
>> With GOP GRUB just uses whatever EFI gives it. How it is implemented
>> inside EFI GRUB has no idea and no control over it. So you have to ask
>> EFI developpers.
>
> Yes, but is EFI capable of supplying grub with graphics support or is the
> GOP interface inherently text only?

GOP is the GraphicsOutput protocol, so it is not text based.  There is
often a GraphicsConsole driver that will allow text to be drawn on the
screen (via GOP).

At the EFI shell, you might be able to verify GOP is present with dh.
For example:

Shell> dh -p graphicsoutput
Handle dump by protocol 'GraphicsOutput'
 71: DevPath (..0x2,0x0)/AcpiAdr(0x80010100))Txtout GraphicsOutput ConOut

Some older EFI systems may not support UEFI 2.0, which is when GOP was
added.  You might look at the output of the ver shell command.  But,
there are other reasons why GOP may not be available in the system
too.

-Jordan