On Wed, Mar 09, 2005 at 05:47:27PM -0500, Bagalkote, Sreenivas wrote: > > > >Even for kernels with a 64bit dma_addr_t you can get 32bit dma > >addresses > >only. As a start check whether the pci_set_dma_mask for the 64bit mask > >failed - in that case you can always use 32bit SGLs. > > > > Please help me understand: If dma_addr_t is 64 bit, I will get 64bit > addresses in scatterlist regardless the outcome of pci_set_dma_mask, > won't I? These addresses may have valid or null high addresses. My idea > was to have 32(64) bit SGLs for 32(64) bit dma_addr_t.
if pci_set_dma_mask for the 64bit mask fails the upper 32bit bit of dma_addr_t will guaranteed to be zero, so you don't need to take them into account for your hardware SGL. - 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/
