From mboxrd@z Thu Jan  1 00:00:00 1970
From: Alex Buell <alex.buell@munted.org.uk>
Date: Mon, 03 Jan 2011 21:36:13 +0000
Subject: Re: Using s3virge card in Sun Blade 2000
Message-Id: <1294090573.17576.16.camel@lithium>
List-Id: <linux-fbdev.vger.kernel.org>
References: <1294083541.17576.11.camel@lithium>
	 <20110103.114301.102556157.davem@davemloft.net>
	 <1294086801.17576.14.camel@lithium>
	 <20110103.123939.02282416.davem@davemloft.net>
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To: David Miller <davem@davemloft.net>
Cc: linux-fbdev@vger.kernel.org, linux-kernel@vger.kernel.org

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

> > 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