On Mon, 2011-01-03 at 12:39 -0800, David Miller wrote:

quoted

I've just started digging into the innards of the s3fb driver, my first
attempt provoked this, simply by commenting out the check to see if it's
not the primary device and exits with -ENODEV: 

Jan  3 20:16:29 sodium kernel: ERROR(1): Cheetah error trap taken
afsr[0030100000000000] afar[00000000000003d0] TL1(0)
Jan  3 20:16:29 sodium kernel: ERROR(1): TPC[105918d8] TNPC[105918dc]
O7[10591884] TSTATE[4411001606]
Jan  3 20:16:29 sodium kernel: ERROR(1): TPC<s3_pci_probe+0x194/0x63c
[s3fb]>
Jan  3 20:16:29 sodium kernel: ERROR(1): M_SYND(0),  E_SYND(0), Multiple
Errors, Privileged

I know, this is what happens if you call vga_*() with a NULL first parameter
on sparc64.  It's accessing garbage addresses.

OK. 

 # lspci -vvxx -s 0:0:03
0000:00:03.0 VGA compatible controller: S3 Inc. ViRGE/DX or /GX (rev 01)
(prog-if 00 [VGA controller])
        Subsystem: S3 Inc. ViRGE/DX
        Physical Slot: PCI 3
        Control: I/O- Mem+ BusMaster- SpecCycle- MemWINV- VGASnoop-
ParErr- Stepping- SERR- FastB2B- DisINTx-
        Status: Cap- 66MHz- UDF- FastB2B- ParErr- DEVSEL=medium >TAbort-
<TAbort- <MAbort- >SERR- <PERR- INTx-
        Interrupt: pin A routed to IRQ 23
        Region 0: Memory at 14000000 (32-bit, non-prefetchable)
[sizedM]
        Region 1: [virtual] Memory at fffff80200000000 (32-bit,
non-prefetchable) [size=1]
        Region 2: [virtual] Memory at fffff80200000000 (32-bit,
non-prefetchable) [size=1]
        Region 3: [virtual] Memory at fffff80200000000 (32-bit,
non-prefetchable) [size=1]
        Region 4: [virtual] Memory at fffff80200000000 (32-bit,
non-prefetchable) [size=1]
        Region 5: [virtual] Memory at fffff80200000000 (32-bit,
non-prefetchable) [size=1]
        Expansion ROM at 00130000 [disabled] [sizedK]
        Kernel driver in use: s3fb
        Kernel modules: s3fb
00: 33 53 01 8a 02 00 00 02 01 00 00 03 00 40 00 00
10: 00 00 00 14 00 00 00 00 00 00 00 00 00 00 00 00
20: 00 00 00 00 00 00 00 00 00 00 00 00 33 53 01 8a
30: 00 00 13 00 00 00 00 00 00 00 00 00 00 01 04 ff

Those are 32 bit addresses, so I suppose I should be getting the base
address for the registers accesses from region 1, right? 
-- 
Tactical Nuclear Kittens