On Wed, Feb 01, 2006 at 10:04:15AM -0800, David Hawkins wrote: > Matt, > > In the same vein as the readl()/writel() question, what > are the assumptions regarding memcpy_toio and memcpy_fromio? > > If the memcpy_to/fromio operations are intended only > for access to PCI devices, then they should also inherently > perform little-endianness conversion. For the test driver > I was working on, I did *not* find this the case, eg. > I implemented the test driver read() and write() using the > memcpy_to/fromio calls, and the data transfers occur > in big-endian (well, 'native' mode, since I also test the > same test driver with the PCI adapter in an x86 system). > > If memcpy_to/fromio can be used in a more general context, > then I can see why they operate in native mode. > > Just looking for enlightenment.
This commands IIRC are intended for copying chunk of _bytes_. There are no issues with endianess for bytes, e.g. they work just like ordinary memcpy. -- Eugene
