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==============
What is efifb?
==============
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
==================
- iMac 17"/20"
- Macbook
- Macbook Pro 15"/17"
- MacMini
- ARM/ARM64/X86 systems with UEFI firmware
How to use it?
==============
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 :
video=efifb:macbook
MacMini :
video=efifb:mini
Macbook Pro 15", iMac 17" :
video=efifb:i17
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:
======= ===========================================================
nowc Don't map the framebuffer write combined. This can be used
to workaround side-effects and slowdowns on other CPU cores
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.
<xres>x<yres>[-(rgb|bgr|<bpp>)]
The EFI stub will search for a display mode that matches the specified
horizontal and vertical resolution, and optionally bit depth, and set
the mode of the display to it if one is found. The bit depth can either
"rgb" or "bgr" to match specifically those pixel formats, or a number
for a mode with matching bits per pixel.
auto
The EFI stub will choose the mode with the highest resolution (product
of horizontal and vertical resolution). If there are multiple modes
with the highest resolution, it will choose one with the highest color
depth.
list
The EFI stub will list out all the display modes that are available. A
specific mode can then be chosen using one of the above options for the
next boot.
Edgar Hucek <gimli@dark-green.com>
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