From: "David S. Miller" <davem@redhat.com>
To: sparclinux@vger.kernel.org
Subject: Re: PSYCHO0 PBMA: PCI streaming byte hole error asserted.
Date: Fri, 09 Jan 2004 08:41:35 +0000 [thread overview]
Message-ID: <20040109004135.28c1a83c.davem@redhat.com> (raw)
In-Reply-To: <1073585763.1669.1.camel@localhost>
On Thu, 8 Jan 2004 14:20:29 -0800
"Feldman, Scott" <scott.feldman@intel.com> wrote:
> > Scott, does the DMA engine of the e1000 do read/write of PCI
> > cache lines with not all the byte enables on? In particular,
> > with descriptor reads/writes?
>
> 82542/82543/82544 only update the status byte of the Tx desc on
> write-back. Only the status byte would be byte-enabled. Every other
> 8254x controller write backs the entire Tx desc (16-bytes) with full
> byte-enables.
I take back what I said, this can't possible be happening for the descriptors
since they are allocated with pci_alloc_consistent() which does not use
streaming DMA mappings.
It must, therefore be occuring on the packet data itself.
prev parent reply other threads:[~2004-01-09 8:41 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2004-01-08 18:16 PSYCHO0 PBMA: PCI streaming byte hole error asserted Josh Grebe
2004-01-08 20:08 ` David S. Miller
2004-01-08 22:20 ` Feldman, Scott
2004-01-09 8:41 ` David S. Miller [this message]
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