linux-kernel - Re: [RFT] e100 driver on ARM

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Message-ID: <4630D116.4080202@zytor.com>
Date:	Thu, 26 Apr 2007 09:19:34 -0700
From:	"H. Peter Anvin" <hpa@...or.com>
To:	Lennart Sorensen <lsorense@...lub.uwaterloo.ca>
CC:	David Acker <dacker@...net.com>,
	"Kok, Auke" <auke-jan.h.kok@...el.com>,
	Lennert Buytenhek <buytenh@...tstofly.org>,
	Jeff Garzik <jeff@...zik.org>,
	Netdev List <netdev@...r.kernel.org>,
	Linux Kernel <linux-kernel@...r.kernel.org>,
	Andrew Morton <akpm@...l.org>,
	Russell King <rmk+lkml@....linux.org.uk>
Subject: Re: [RFT] e100 driver on ARM

Lennart Sorensen wrote:
> 
> My suspicision (although it is only that) is that the PXA255 trying to
> access memory may cause interruptions in PCI bus master transfers, which
> is of course not permitted by the PCI spec (at least the way I read it).

Why wouldn't that be permitted?  It, in fact, happens all the time (the
host bridge withdraws the GNT# line and raises STOP#, which does a
Termination With Data of the bus transfer.)  This is a normal event and
if you can't handle it you won't work with many host bridges at all.

	-hpa
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