[Bug 26891] Radeon KMS on Macs with EFI boot

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=26891

--- Comment #5 from shirk at bitspin.org 2011-05-17 03:31:16 PDT ---
(In reply to comment #4)
I assume you're not familiar with mac or didn't read the while bug history.
Mac are booted using the EFI runtime one of the successors to BIOS.

> What is the real reason that the driver doesn't see the video BIOS? Is it
> looking at the wrong address? Is some MMU wrongly setup? I mean the video BIOS
> is obviously there,
You're wrong here. The bios is there if you boot in 'legacy mode'.
Legacy mode means your EFI machine will load and run a (slow) BIOS emulation.

> if you can extract it with dd.
This exact step happens in legacy mode.
If you boot in native EFI you don't have any BIOS at all.

> I would rather see the real
> bug fixed than have a workaround.
As nice as it sounds 'fixing' would imply writing a separate
KMS driver which would work entirely without the need to access the BIOS.

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