Matt Porter wrote:

On Fri, Feb 25, 2005 at 04:19:41PM -0500, Ralph Siemsen wrote:

quoted

Will that work on the 440 where the devices sit above 4GB mark?  Or must 
one rely on there being an existing TLB mapping to bring them into 
32-bit space?

EINVAL.

mmap certainly didn't like the phys address of gpio.  Tried that.

Ack...that's the one thing we are missing. :-/ I had forgotten
that driver/char/mem.c  calls remap_pfn_range() directly rather
than io_remap_page_range(). Had it called the latter, we'd be OK
since the "bigphys" fixup could take place.  We can fix /dev/mem to
call io_remap_page_range() when on ppc32 && 36-bit phys...other arches
do similar tricks in that driver.

Sounds like a plan, I'd be happy to test it out.

If everybody is happy with mmaping /dev/mem then we can go try that
route.

Thanx,

Travis