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: stefandoesin...@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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