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Date: Thu, 11 May 2006 23:44:37 -0700 (PDT)
From: Monika Borikar <monika_borikar@yahoo.com>
Subject: DMA problem on PPC 74xx
To: linuxppc-dev@ozlabs.org
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Hello All,
 
 I am working on PPC 74xx processor which uses Marvell mv64360 host bridge. On PPC linux-2.6.12.5 (with EV64360 patch ) is running, with CONFIG_NOT_COHERENT_CACHE=y option in .config file.
 
 I have a pci device which has to do DMA transfer from PPC memory. This pci device is DMA master for all dma transactions. The device driver on PPC allocates memory using pci_alloc_consistent & write the data to this allocated memory. Address of this allocated memory is given to device using which device is supposed to do read/write using dma mechanism.
 
 Looks like dma transfer is not happening. I found few mails which talks about some problem with caching. Can anybody guide me if there is any such issue & how to solve that?
 
 Thanks
 -Monika
 
 
		
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Hello All,<br> <br> I am working on PPC 74xx processor which uses Marvell mv64360 host bridge. On PPC linux-2.6.12.5 (with EV64360 patch ) is running, with CONFIG_NOT_COHERENT_CACHE=y option in .config file.<br> <br> I have a pci device which has to do DMA transfer from PPC memory. This pci device is DMA master for all dma transactions. The device driver on PPC allocates memory using pci_alloc_consistent &amp; write the data to this allocated memory. Address of this allocated memory is given to device using which device is supposed to do read/write using dma mechanism.<br> <br> Looks like dma transfer is not happening. I found few mails which talks about some problem with caching. Can anybody guide me if there is any such issue &amp; how to solve that?<br> <br> Thanks<br> -Monika<br> <br> <p>
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