Re: [parisc-linux] Re: [PATCH] PCMCIA: Disable probing on parisc

[Grant Grundler <grundler@parisc-linux.org>]

On Sun, Dec 11, 2005 at 09:14:33AM -0600, James Bottomley wrote:
> On Sat, 2005-12-10 at 23:50 -0700, Grant Grundler wrote:
> > Could post the /proc/iomem output?
> 
> Sure, it's below

thanks

> > It just occurred to me that you shouldn't need to bring down the network.
> > We can verify if an IO range resource didn't get parented correctly or
> > otherwise failed to get registered.
> 
> Well, yes I do.  I still need to verify that the kernel works without
> the probe prevention hack.

Sorry, I wasn't clear - just referring to grabbing the /proc/iomem output.

>   The problem years ago wasn't the parenting,
> it was PCMCIA looking for things like ISA memory regions.  I know the
> card currently gets the correct parenting and regions (because it
> works).

I agree - the output for "Dino LMMIO 0" is correct.

>  The question is would it without the pcmcia hack?

*nod*.  If PCMCIA code is accessing IO Port space looking for legacy
ISA devices, then a parisc box will definitely HPMC.

Most of the parisc PCI bus controllers can only "hard fail" on a
PCI Master Abort for both IO Port and MMIO space accesses. I know
this isn't expected behavior for IO port space but HPUX didn't need
to handle this more gracefully.

I've learned that "ISA Memory regions" are 20 bits for 8-bit ISA or
24-bits for 16-bit ISA. In both cases, I would expect Host RAM to
respond instead of any IO device.  E.g. VGA memory at 0xa0000-0xb0000
would get garbage instead of an HPMC.

thanks,
grant
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