Re: [parisc-linux] Matrox Millenium II in C240

[Matthew Wilcox <willy@debian.org>]

On Thu, Jan 02, 2003 at 10:17:15PM -0700, Grant Grundler wrote:
> Does it? are the 64-bit slots 3.3v only?

Yep.  Thought that was part of the PCI spec, though maybe I'm confused with
66MHz.

> > Has anyone before succeeded in accessing mmio space of PCI
> > card attached to the 32bit PCI bus of the C240 ?
> 
> SCSI is accessed that way. tulip driver can be tweaked to use MMIO
> if you don't have any 100BT GSC (card-mode Dino) cards.

umm.. I thought cardmode MMIO was working now on B/C/J class machines.
I think D/K/R still have resource management issues.

> > 00:01.0 VGA compatible controller: Matrox Graphics, Inc. MGA 2164W [Millennium II] (prog-if 00 [VGA])
> > 	Subsystem: Matrox Graphics, Inc.: Unknown device 2003
> > 	Flags: medium devsel, IRQ 97
> > 	Memory at f9000000 (32-bit, prefetchable) [size=16M]
> > 	Memory at f3ffc000 (32-bit, non-prefetchable) [size=16K]
> > 	Memory at f2800000 (32-bit, non-prefetchable) [size=8M]
> > 	Expansion ROM at f3f80000 [disabled] [size=64K]
> 
> Looks like PDC/IODC did it's thing.
> Look at matrox drivers to make sure they are calling
> "pci_device_enable()" and ioremap() before attempting to access
> the device.
> 
> Check /proc/iomem to see which PCI bus controller
> this is getting routed through and that the system
> has correctly identified the MMIO resources.
> 
> It's interesting one device has MMIO at both 0xf2800000
> and 0xf9000000 since it would imply one PCI controller is supposed
> to forward the entire range of addresses. But Dino only forwards
> (any number of) 8MB chunks between 0xf0800000 and 0xff800000 (except
> the first and last 8MB chunks).

I think this may well be the problem.  I bet Dino hasn't been programmed
to forward the 16MB range at f900'0000, and Linux has just found an
unused bit of address space and allocated it to the Matrox card.

-- 
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