For those variants of BCM43xx cards that use 64-bit DMA, there is a requirement that all descriptor rings must be aligned on an 8K boundary and must fit within an 8K page. On the x86_64 architecture where the page size is 4K, I was getting addresses like 0x67AF000 when using dma_alloc_coherent calls. From the description of the dma_pool_create and dma_pool_allocate routines, I thought they would fix my problems; however, even with a dma_pool_create(name, dev, 8192, 8192, 8192) call, I'm still getting 4K rather than 8K alignment, which results in DMA errors.
Is there a bug in these routines, am I using them incorrectly, or do I have a misunderstanding of what it takes to get this kind of alignment? Thanks, Larry - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
