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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 <[email protected]>
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