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efi/gop: Allow specifying mode number on command line

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Add the ability to choose a video mode for the selected gop by using a
command-line argument of the form
	video=efifb:mode=<n>

Signed-off-by: Arvind Sankar <nivedita@alum.mit.edu>
Link: https://lore.kernel.org/r/20200320020028.1936003-12-nivedita@alum.mit.edu
Signed-off-by: Ard Biesheuvel <ardb@kernel.org>
This commit is contained in:
Arvind Sankar
2020-03-19 22:00:25 -04:00
committed by Ard Biesheuvel
parent b4b89a0272
commit fffb68047e
4 changed files with 129 additions and 3 deletions
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20
Documentation/fb/efifb.rst
View File

@@ -2,8 +2,10 @@
What is efifb?
==============
This is a generic EFI platform driver for Intel based Apple computers.
efifb is only for EFI booted Intel Macs.
This is a generic EFI platform driver for systems with UEFI firmware. The
system must be booted via the EFI stub for this to be usable. efifb supports
both firmware with Graphics Output Protocol (GOP) displays as well as older
systems with only Universal Graphics Adapter (UGA) displays.
Supported Hardware
==================
@@ -12,11 +14,14 @@ Supported Hardware
- Macbook
- Macbook Pro 15"/17"
- MacMini
- ARM/ARM64/X86 systems with UEFI firmware
How to use it?
==============
efifb does not have any kind of autodetection of your machine.
For UGA displays, efifb does not have any kind of autodetection of your
machine.
You have to add the following kernel parameters in your elilo.conf::
Macbook :
@@ -28,6 +33,9 @@ You have to add the following kernel parameters in your elilo.conf::
Macbook Pro 17", iMac 20" :
video=efifb:i20
For GOP displays, efifb can autodetect the display's resolution and framebuffer
address, so these should work out of the box without any special parameters.
Accepted options:
======= ===========================================================
@@ -36,4 +44,10 @@ nowc Don't map the framebuffer write combined. This can be used
when large amounts of console data are written.
======= ===========================================================
Options for GOP displays:
mode=n
The EFI stub will set the mode of the display to mode number n if
possible.
Edgar Hucek <gimli@dark-green.com>