uncached user space mapping with mmap() ???

Eugene Surovegin ebs at ebshome.net
Fri Mar 5 04:28:13 EST 2004

On Thu, Mar 04, 2004 at 03:35:46PM +0100, Steven Scholz wrote:
> >There's no need to implement kernel side stuff. /dev/mem is enough.
> So why will people need their own mmap() driver if this kind of things
> can be done via /dev/mem ???

There are CPUs (e.g. PPC440) where you cannot use /dev/mem to
map I/O memory. In case of PPC440 it isn't in 4GB address space that
/dev/mem can access.


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