From: "Sauce.Cheng" <chmhou@sina.com>
To: linuxppc-dev@ozlabs.org
Subject: question : DMA of PCI bridge
Date: Tue, 19 May 2009 20:19:54 -0700 (PDT) [thread overview]
Message-ID: <23628338.post@talk.nabble.com> (raw)
excuse me
I hate to bother everyone but I have a question about DMA of PCI bridge
Now I attempt to fetch data from peripheral device to SDRAM, and it has been
successed
but how the DMA controller know the data bandwidth of src and dest.
for example, if i get a 16bits data with a 32bits bus, and other 16bits will
be set high
and data will fetched into cache line of dma, then it will be wrote to
32bits SDRAM.
i guess the data will be wrong, isn't ?
please give me some advices. thank you
--
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next reply other threads:[~2009-05-20 3:19 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-05-20 3:19 Sauce.Cheng [this message]
2009-05-20 3:51 ` question : DMA of PCI bridge David Hawkins
2009-05-21 3:42 ` Sauce.Cheng
2009-05-21 3:57 ` David Hawkins
2009-05-22 3:24 ` Sauce.Cheng
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