[Bug 26891] Radeon KMS fails with inaccessible AtomBIOS on systems with (U)EFI boot

[bugzilla-daemon at freedesktop.org]

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

--- Comment #53 from Benjamin Lee <ben at b1c1l1.com> ---
I can also confirm that Radeon KMS works on my MacBookPro8,2 with kernel
version 3.8-rc6 and EFI stub boot.  I also needed to add a device section to my
xorg.conf.

I don't see any video BIOS in /dev/mem so I guess it is loading from ACPI
instead.  Out of curiosity, I tried to load fglrx and it failed to find a valid
VBIOS so fglrx must not have the ACPI loading method.

blee at supra ~ $ sudo dd if=/dev/mem of=/dev/stdout bs=65536 skip=12 count=1
2>/dev/null | hexdump
0000000 ffff ffff ffff ffff ffff ffff ffff ffff
*
0010000

[    2.589927] [drm] Initialized drm 1.1.0 20060810
[    2.589966] [drm] radeon defaulting to kernel modesetting.
[    2.589969] [drm] radeon kernel modesetting enabled.
[    2.590189] [drm] initializing kernel modesetting (TURKS 0x1002:0x6741
0x106B
:0x00E2).
[    2.590226] [drm] register mmio base: 0xB0800000
[    2.590229] [drm] register mmio size: 131072
[    2.590253] ATOM BIOS: Apple
[    2.590264] [drm] GPU not posted. posting now...
[    2.599466] radeon 0000:01:00.0: VRAM: 1024M 0x0000000000000000 -
0x000000003
FFFFFFF (1024M used)
[    2.599472] radeon 0000:01:00.0: GTT: 512M 0x0000000040000000 -
0x000000005FF
FFFFF
[    2.604787] [drm] Detected VRAM RAM=1024M, BAR=256M
[    2.604793] [drm] RAM width 128bits DDR
[    2.604843] [TTM] Zone  kernel: Available graphics memory: 4042710 kiB
[    2.604846] [TTM] Zone   dma32: Available graphics memory: 2097152 kiB
[    2.604849] [TTM] Initializing pool allocator
[    2.604858] [TTM] Initializing DMA pool allocator
[    2.604893] [drm] radeon: 1024M of VRAM memory ready
[    2.604896] [drm] radeon: 512M of GTT memory ready.
[    2.604917] [drm] Supports vblank timestamp caching Rev 1 (10.10.2010).
[    2.604920] [drm] Driver supports precise vblank timestamp query.
[    2.604982] radeon 0000:01:00.0: irq 45 for MSI/MSI-X
[    2.604993] radeon 0000:01:00.0: radeon: using MSI.
[    2.605028] [drm] radeon: irq initialized.
[    2.605033] [drm] GART: num cpu pages 131072, num gpu pages 131072
[    2.605463] [drm] probing gen 2 caps for device 8086:101 = 2/0
[    2.605470] [drm] PCIE gen 2 link speeds already enabled
[    2.605534] [drm] Loading TURKS Microcode

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