Sorry to bump the post, i'm wondering if it was correctly sent. Le 21/03/2013 09:54, CF Studelec a écrit : > 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 >
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