From: Scott Wood <scottwood@freescale.com>
To: Mike Winter <mike.winter@vecimanetworks.com>
Cc: linuxppc-embedded@ozlabs.org
Subject: Re: PCI DMA Problems With 82xx?
Date: Tue, 17 Jun 2008 16:29:42 -0500 [thread overview]
Message-ID: <48582CC6.60004@freescale.com> (raw)
In-Reply-To: <4858113F.4050203@vecimanetworks.com>
Mike Winter wrote:
> We are developing with an 8248-based platform, and we have a vendor
> telling us that the PCI hardware is unreliable on this CPU family, in
> particular the DMA functionality. A quick search of this list doesn't
> turn up any horror stories, although the processor does have some PCI
> errata listed. Does anybody have any practical experience using PCI on
> the 8248 or similar that they can share with me? Thanks.
Make sure that you park the bus on PCI, and elevate PCI's arbitration
priority. See fixup_pci() in arch/powerpc/boot/cuboot-pq2.c.
I haven't had a problem with PCI DMA when that is done, though I haven't
done significant stress testing.
-Scott
next prev parent reply other threads:[~2008-06-17 21:29 UTC|newest]
Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-06-17 19:32 PCI DMA Problems With 82xx? Mike Winter
2008-06-17 21:29 ` Scott Wood [this message]
2008-06-17 21:49 ` Rune Torgersen
2008-06-17 21:51 ` Rune Torgersen
2008-06-17 21:52 ` Scott Wood
2008-06-18 13:32 ` Anybody have an mpc5200b mscan linux driver under 2.6.24, ARCH=powerpc or equiv? Mike Timmons
2008-06-18 13:45 ` Wolfgang Grandegger
2008-06-18 14:02 ` Mike Timmons
2008-06-18 14:18 ` Wolfgang Grandegger
2008-06-18 16:16 ` Mike Timmons
2008-06-19 10:38 ` Daniel Schnell
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