On 12/21/2009 03:47 PM, Michael Buesch wrote: > On Monday 21 December 2009 22:31:10 Larry Finger wrote: >> Hi, >> >> I placed a number of test prints in my system trying to find where a >> DMA data error might occur. In doing so, I found that 3 slots in the >> DMA header cache cross a page boundary. Such a situation is allowed on >> my system, but it might be forbidden on Atom processors. Please try >> this really ugly hack to see if it makes any difference. > > First thing is that the DMA buffers are allowed to cross any boundary (and > the header is just a buffer). The boundary requirements only apply to the > memory holding the descriptors.
That is what we will test for the Atom. I know it doesn't matter for my CPU, but ... > Second thing is: How does the patch prevent a boundary crossing? The number of slots is reduced to the point that the header cache fits in one page, just as the RX header cache does. As I said, this is really ugly. If this fixes the problem, then a more elegant fix will be needed. Larry _______________________________________________ Bcm43xx-dev mailing list [email protected] https://lists.berlios.de/mailman/listinfo/bcm43xx-dev
