Ah hah. I got it working. Turns out using the ioremapped address was bad, I had to use the actual nonremapped physical address.
Thanks for the info! -naru On Tue, Jun 06, 2006 at 02:16:10PM -0700, Naru Sundar wrote: > To clarify, I am definitely using the physical addresses. virt_to_bus and > virt_to_phys result in the same value. My transfer completes and I see > BCR go back to 0, but I can't manage to actually see any data difference > at the destination side. > > The destination address is an ioremapped region that I pass through > virt_to_phys. The src is kmalloc'd memory that has GFP_DMA set. > > On Tue, Jun 06, 2006 at 11:55:48AM -0700, Naru Sundar wrote: > > On Tue, Jun 06, 2006 at 09:39:29AM +0800, Liu Dave-r63238 wrote: > > > What is the DMA transfer mode? Is direct or chaining mode? > > > > Direct mode. I fixed an error with my bit ordering for the configuration > > registers, and now the transfer seems to complete, but I don't see any > > actual data showing up in the destination register that I am writing to. > > > > > Did you ioremap the DMA register space? > > > > Yes, I can write the destination address manually. So I am thinking my > > addresses > > are wrong. > > > > For the source and dest address I used: > > > > dma_map_single(NULL, ptr, len, DMA_TO_DEVICE) > > > > (which effectively does a virt_to_bus on ppc and so should just return to me > > the bus address used by the dma). > > > > -naru > > _______________________________________________ > > Linuxppc-embedded mailing list > > Linuxppc-embedded at ozlabs.org > > https://ozlabs.org/mailman/listinfo/linuxppc-embedded > _______________________________________________ > Linuxppc-embedded mailing list > Linuxppc-embedded at ozlabs.org > https://ozlabs.org/mailman/listinfo/linuxppc-embedded
