Re: Using devmem2 to access GPIO and HW registers on AT91SAM9260

["Michel Benoit" <murpme@xxxxxxxxx>]

> > Some kind folks from this list have helped me determined that mmap
> > ought to be able to access the pins and registers on an at91sam9260. I
> > have some code compiled to do just that. The only difficulty now is
> > determining where linux is mapping these to. Has anyone had any
> > success using devmem2 with at at91sam9260 or something similar to
> > read/write pins/registers. If so, how did you determine where to
> > locate those items on the mmap?
> >
> you may start from the gpio utility for AT91RM9200 and update it to the
> memory map of AT91SAM9260 :
> http://www.ipbx.ru/rm9200/gpio-RM9200.tar.gz

The application gpio-RM9200.tar.gz works fine (as is) on the
AT91SAM9260 when mmap in uclibc is fixed to handle offset values above
0x80000000 (i.e most significant bit set == negative signed number).

Michel

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