Re: PATA_ARTOP reads byte from PCI IO port without mapping it tothe right address.

[Alan Cox]

On Wed, 30 Mar 2011 20:48:26 +0100
Daniel Palmer <me@xxxxxxxxxxxxxxxxxx> wrote:

> 
> >  That is the PCI port address.
> 
> I don't pretend to understand most of this fully.
> On the board the PCI address space/PCI controller is apparently at 
> 0xfe240000
> So I guess that when that byte is read it should read from 0xfe240000 + 
> 0x1400?
> That doesn't happen and a read happens at 0x1400 and an oops results.
> I don't know enough to point the finger really.
> 
> There are probably only 2 people using this board still too. So I doubt 
> it really matters. :)

That sounds like the inb() function has been broken by a change perhaps
by some related board change - if your I/O is mapped as you describe I'd
expect inb() to be implemented as something like


	return *(volatile u8 *)(0xfe2400 + addr)

Might be worth bisecting between a good and bad release as it ought to be
easy to find

Alan
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