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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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View this message in context: http://www.nabble.com/question-%3A-DMA-of-PCI-bridge-tp23628338p23628338.html
Sent from the linuxppc-dev mailing list archive at Nabble.com.

             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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