From mboxrd@z Thu Jan  1 00:00:00 1970
From: bugzilla-daemon@freedesktop.org
Subject: [Bug 26891] New: Radeon KMS on Macs with EFI boot
Date: Thu,  4 Mar 2010 12:46:12 -0800 (PST)
Message-ID: <bug-26891-502@http.bugs.freedesktop.org/>
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http://bugs.freedesktop.org/show_bug.cgi?id=26891

           Summary: Radeon KMS on Macs with EFI boot
           Product: DRI
           Version: XOrg CVS
          Platform: Other
        OS/Version: All
            Status: NEW
          Severity: normal
          Priority: medium
         Component: DRM/Radeon
        AssignedTo: dri-devel@lists.sourceforge.net
        ReportedBy: stefandoesinger@gmx.at


Created an attachment (id=33766)
 --> (http://bugs.freedesktop.org/attachment.cgi?id=33766)
Bios from firmware loading hack

Apple's iMacs and MacBooks don't have a video bios loaded when booting the
Linux Kernel via an EFI bootloader rather than using Apple's bootcamp PC bios
compatibility layer. This prevents the ATI Radeon kernel modesetting from
working.

Grub2 has a functionality to load a video bios image from a file stored on the
efi boot partition. This makes the user mode setting in the X11 driver happy,
but the kernel driver doesn't find the bios(invalid PCI Rom signature). Hacking
the driver to try the load-from-vram method doesn't work either.

I have created a hacky new bios loading method that loads a bios image via the
kernel firmware loader from radeon/vbios.bin. I created this file from a
bootcamp boot in the way documented in the Grub 2
wiki(http://grub.enbug.org/TestingOnMacbook). This way radeon KMS works, but
like loading a bios image via the bootloader this is not a particularily pretty
solution.

I am using a native EFI bootloader instead of bootcamp because bootcamp is not
capable of booting from a USB disk.


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