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

[James Bottomley]

On Tue, 2005-12-06 at 09:36 +0000, Russell King wrote:
> I don't think you've fully understood what I've been saying.
> When we try to do memory probing, we setup a mapping in the same
> way that we setup a mapping to read the CIS from the card.

Yes, I do.  On PARISC, memory I/O ranges are directed.  If you program
the CIS to respond outside the directed range of its parent, the I/O
transaction will never get through because the direction is done by the
parent bus (which you aren't programming).  This then causes a HPMC
because no entity on the runway bus responds to the memory read.

James