PCI Radeon RV100 detection hang on sparc64

[Meelis Roos]

> >>>> 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.
> >>
> >> Yes, it is doing direct readl() there. But what does this hang mean?
> >
> > I'm not sure if the read can hang because of the GPU, or if indicates a more
> > fundamental PCI issue. Dave?
[...]
> Just a short question regarding the test setup.
> Is the video card a Sun XVR-100 or is it a vanilla ATI RV100 ?
> (If it is a vanilla RV100 there might be some kind of initialization issue
> as the video ROM is not executed during boot?)

It,s SUNW,XVR-100 with F-code ROM.

-- 
Meelis Roos (mroos at linux.ee)