From: Howard Gray <ppclist@matrix-vision.de>
To: linuxppc-embedded@lists.linuxppc.org
Subject: Re. Davicom DM9102A Network Problems
Date: Wed, 31 Jul 2002 15:50:02 +0200 [thread overview]
Message-ID: <200207311550.02892.ppclist@matrix-vision.de> (raw)
Howard Gray wrote....
>> How can the tulip driver work with the DM9102A at all if the transmit
>> buffers are not guaranteed to be correctly aligned ?
Answering one of my own questions.....
According to a chip errata sheet the DM9102A Rev. 0x40 requires double word
aligned transmit buffers but earlier revisions (e.g. 0x31) didn't. I guess
the tulip driver works well with older revisions only.
But my question still remains: How can I get a double word aligned transmit
buffer using the network core's sk_buff mechanism ? If I can't do that I'll
have to rewrite the driver to use use my own aligned buffers and copy the
sk_buff data to them. It's a pity because then it doesn't make much sense to
follow that with a DMA transfer....
--
Howard Gray
MATRIX Vision GmbH
Oppenweiler
Germany
** Sent via the linuxppc-embedded mail list. See http://lists.linuxppc.org/
next reply other threads:[~2002-07-31 13:50 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2002-07-31 13:50 Howard Gray [this message]
2002-07-31 14:11 ` Re. Davicom DM9102A Network Problems Christian Pellegrin
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