[Bug 95015] [drm:.r600_ring_test [radeon]] *ERROR* radeon: ring 0 test failed (scratch(0x8504)=0xCAFEDEAD)

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=95015

            Bug ID: 95015
           Summary: [drm:.r600_ring_test [radeon]] *ERROR* radeon: ring 0
                    test failed (scratch(0x8504)=0xCAFEDEAD)
           Product: DRI
           Version: XOrg git
          Hardware: PowerPC
                OS: Linux (All)
            Status: NEW
          Severity: major
          Priority: medium
         Component: DRM/Radeon
          Assignee: dri-devel at lists.freedesktop.org
          Reporter: rsalvaterra at gmail.com

Created attachment 123045
  --> https://bugs.freedesktop.org/attachment.cgi?id=123045&action=edit
dmesg

Full dmesg attached. I have a Power Mac G5 (late 2005, PCIe) with a Radeon HD
6450 (CAICOS, x86 BIOS) installed on the PCIe x16 slot, and I get this error on
boot. I also have a GeForce 6600 (Open Firmware) on a PCIe x8 slot, which works
fine, minus the usual nouveau caveats. I have no idea if this is related at
all, but the x16 slot is directly connected to the U4 northbridge, and is
capable of bypassing the DART IOMMU for 64-bit DMA capable devices (like the
Radeon). The other slots are connected to a PCIe bridge on the HyperTransport
bus, and DMA always goes through the DART. If needed, I can provide ssh access
to the machine.

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