Hello, This is a simple board base on mpc5121e MCU.
Gpio is detected: kernel is compiled with its support - i got gpiochip_find_base: found new base @224 in dmesg - on kernel 3.0.4. But i'm unable to access it through /sys/class/gpio. I can successfully export a pin (ie, if i type cat 224 > export, gpio224 is created), but i can't successfully control it: echo "out" > /sys/class/gpio/gpio224/direction cat /sys/class/gpio/gpio224/value 0 echo 1 > /sys/class/gpio/gpio224/value cat /sys/class/gpio/gpio224/value 0 My need is a simple chipselect (well, 3 chipselect exactly ), for a custom design. Running linux is mandatory. I suspect the MPC5121e to be in the bad function mode, so: - does anyone knows how to change mode ? What register can i acces and how ? does it worths a try ? - does anyone successfully performed simple IO control ? Last thing, i have tryed to access internal registers through /dev/mem, but no success. There are very few ressources available for this microcontroler, but i'm stick to it. Perhaps anybody knows how to access (read) internal registers with /proc or sys-fs ? Thank you for your help. _______________________________________________ Linuxppc-dev mailing list Linuxppc-dev@lists.ozlabs.org https://lists.ozlabs.org/listinfo/linuxppc-dev
