On May 16, 2007, at 4:59 PM, Charles Krinke wrote: > I have a need to be able to read and write the gpio data registers > PDATC > and PDATD from a user space program. > > We have a userspace program that succesfully mmaps an offset in / > dev/mem > and reads/writes registers in a CPLD at 0xFF00_0000. > > The issue seems to be that when I mmap /dev/mem to 0xE000_0D50 to read > the PDATC register, Linux-2.6.17.11 just locks up. > > Can anyone shed a little light on why this could be happening?
One theory is you aren't reading PDATC at the right offset. Not sure what happens if you read a non-existent register offset. I'm think you want 0xe009_0d50. - k _______________________________________________ Linuxppc-embedded mailing list [email protected] https://ozlabs.org/mailman/listinfo/linuxppc-embedded
