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From: Shihping on 25 Jun 2010 02:20
Hi,

I try to load dmatest module in linux-2.6.34 on Ubuntu x86_64 Server system
but when I loaded dmatest module, I got "__dma_request_channel:fall
((null))"  message.
It seems unable to allocate DMA channel.

But I found /proc/dma was registed to cascade mode like
# cat /proc/dma
 4:cascade

So I thought DMA channel should be registed by DMA controller in ICH
successfully. right?

My plaform use Intel E5100(San Clemente) and ICH9R chipset,there were
2 DMA controller was embedded in ICH9R chip.
Is dmatest module not work with ICH9R ? or some other reason cause this?

Sorry about my poor English, and thanks for your answers and responses


Shihping Chen
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