Re: [PATCH] New frame buffer detection algorithm and loadrom command for efi platform

[step21]

nice ... will try to test this asap.

2009/3/21 Bean <address@hidden>:
> Hi,
>
> This patch improves the frame buffer detection algorithm. It uses pci
> to find the video memory base, then scan it for frame buffer.
>
> It also add a loadrom command which can be used to enable accel
> graphic driver. The idea is that you can grab the video bios dump, and
> optionally the IVT from pc mode, then load them in efi.
>
> To grab bios dump:
> sudo dd if=/dev/mem of=bios.bin bs=65536 skip=12 count=1
>
> You can also include the system bios by changing the count to 4.
>
> To grab IVT dump:
> sudo dd if=/dev/mem of=ivt.bin bs=1024 count=1
>
> Then, to load them in grub-efi (ivt.bin is optionally):
> loadrom /bios.bin /ivt.bin
>
> Here are some of the findings concerning different video cards:
>
> Old 32-bit efi model, intel card:
> Works with intel driver, no need to load vbios or ivt.
>
> New 64-bit efi model, intel card:
> Works with intel driver, needs to load vbios.
>
> New 64-bit efi model, nvidia card:
> Works with nvidia driver, no needs to load vbios or ivt. However, the
> backlight value is set too low so desktop is barely visible. You need
> to use a small tool to adjust backlight. The nv driver doesn't work.
>
> New 64-bit efi model, ati radeon card:
> Works with fglrx driver, needs to load vbios and ivt. The radeonhd
> driver doesn't work.
>
> --
> Bean
>
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>