PCI Radeon RV100 detection hang on sparc64

Michel Dänzer michel at daenzer.net
Mon Aug 25 19:46:52 PDT 2014

On 25.08.2014 23:48, Meelis Roos wrote:
>> r100 init hangs in a different place. Original dmesg first, then my
>> instrumented dmesg (seems to get further):
> The instrumented dmesg had a couple of my local test changes and was
> bad now that I had ROM. Reverted them exept my readb changes (instead
> of direct dereferences of iomapped space) and redid
> logging to be more precise.
>> [drm] radeon kernel modesetting enabled.
>> PCI: Enabling device: (0000:02:02.0), cmd 82
>> [drm] initializing kernel modesetting (RV100 0x1002:0x5159 0x1002:0x0908).
>> [drm] register mmio base: 0x10000000
>> [drm] register mmio size: 32768
>> [drm:radeon_device_init] *ERROR* Unable to find PCI I/O BAR
> This was still the unchanged kernel hanging.
> Below is a new debug log to pinpoint the hang. It seems to hang in
> r100_gfx_get_rptr but not on first try.

It's most likely hanging in readl() in r100_mm_rreg() then.

Earthling Michel Dänzer            |                  http://www.amd.com
Libre software enthusiast          |                Mesa and X developer

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