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esxijoe@

Any luck with this?  I'm getting the same errors as you:

Mar 25 15:41:05 test9 kernel: radeon 0000:13:00.0: enabling device (0000 -> 0003)

Mar 25 15:41:05 test9 kernel: [drm] initializing kernel modesetting (OLAND 0x1002:0x6610 0x1787:0x2012).

Mar 25 15:41:05 test9 kernel: [drm] register mmio base: 0xD2F00000

Mar 25 15:41:05 test9 kernel: [drm] register mmio size: 262144

Mar 25 15:41:05 test9 kernel: radeon 0000:13:00.0: BAR 6: can't assign [??? 0x00000000 flags 0x20000000] (bogus alignment)

Mar 25 15:41:05 test9 kernel: radeon 0000:13:00.0: BAR 6: can't assign [??? 0x00000000 flags 0x20000000] (bogus alignment)

Mar 25 15:41:05 test9 kernel: [drm:radeon_get_bios [radeon]] *ERROR* Unable to locate a BIOS ROM

Mar 25 15:41:05 test9 kernel: radeon 0000:13:00.0: Fatal error during GPU init

Mar 25 15:41:05 test9 kernel: [drm] radeon: finishing device.

Mar 25 15:41:05 test9 kernel: [TTM] Memory type 2 has not been initialized

Mar 25 15:41:05 test9 kernel: radeon: probe of 0000:13:00.0 failed with error -22

My hardware:

(CentOS 7 fails the same way.)  I've disabled onboard graphics and audio.  I've tried re-loading the radeon module in Fedora with runpm=0, pcie_gen2=1, and msi=0 but no joy.