On Mon, Jun 02, 2008 at 10:11:02AM +0200, Haavard Skinnemoen wrote: > Geert Uytterhoeven <geert@xxxxxxxxxxxxxx> wrote: > > On Fri, 30 May 2008, Haavard Skinnemoen wrote: > > > Maybe we need another interface that does not do byteswapping but > > > provides stronger ordering guarantees? > > > > The byte swapping depends on the device/bus. > > Of course. But isn't it reasonable to assume that a device integrated > on the same silicon as the CPU is connected to a somewhat sane bus > which doesn't require any byte swapping? No, unfortunately. :-( See the end of drivers/dma/fsldma.h. Likewise with Freescale's PCI host bridges; for some reason the bus itself being little endian led to the host bridge control registers also being little endian. -Scott -- To unsubscribe from this list: send the line "unsubscribe linux-arch" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
