Messages in this thread | | | Subject | Re: [PATCH] libata-sff: Don't call bmdma_stop on non DMA capable controllers | From | David Woodhouse <> | Date | Fri, 26 Jan 2007 00:26:15 +0800 |
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On Thu, 2007-01-25 at 16:22 +0000, Russell King wrote: > The zero DMA address is absolutely and totally valid. It might not > correspond with physical address zero on platforms. > > Also, DMA address zero is not the same as NULL.
This isn't actually "DMA address" in that context -- it's the I/O port number at which the controller's BM-DMA control registers reside. But still it can be zero.
-- dwmw2
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