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doc: coreboot: Update stale graphics enabling instructions

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With latest coreboot (e.g.: v4.22.01), the instructions to enable
graphics support has changed. Refresh the doc.

Signed-off-by: Bin Meng <bmeng.cn@gmail.com>
This commit is contained in:
Bin Meng 2024-01-05 07:25:42 +08:00 • committed by Heinrich Schuchardt
parent 6caf3a3e89
commit 86efd04934
1 changed files with 6 additions and 7 deletions
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13
doc/board/coreboot/coreboot.rst
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@ -32,10 +32,9 @@ of _x86boot_start (in arch/x86/cpu/start.S).
If you want to use ELF as the coreboot payload, change U-Boot configuration to
use CONFIG_OF_EMBED instead of CONFIG_OF_SEPARATE.
To enable video you must enable these options in coreboot:
To enable video you must enable CONFIG_GENERIC_LINEAR_FRAMEBUFFER in coreboot:
- Set framebuffer graphics resolution (1280x1024 32k-color (1:5:5))
- Keep VESA framebuffer
- Devices->Display->Framebuffer mode->Linear "high resolution" framebuffer
At present it seems that for Minnowboard Max, coreboot does not pass through
the video information correctly (it always says the resolution is 0x0). This
@ -184,13 +183,13 @@ boot as a coreboot payload, based on a known-good build of coreboot.
To update the `coreboot.rom` file which is used:
#. Build coreboot with `CONFIG_LINEAR_FRAMEBUFFER=y`. If using `make menuconfig`
this is under
`Devices ->Display->Framebuffer mode->Linear "high resolution" framebuffer`.
#. Build coreboot with `CONFIG_GENERIC_LINEAR_FRAMEBUFFER=y`. If using
`make menuconfig`, this is under
`Devices->Display->Framebuffer mode->Linear "high resolution" framebuffer`.
#. Compress the resulting `coreboot.rom`::
xz -c /path/to/coreboot/build/coreboot.rom >coreboot.rom.xz
xz -c /path/to/coreboot/build/coreboot.rom > coreboot.rom.xz
#. Upload the file to Google drive