Problem solved with new Kernel from 4.1.x Le vendredi 19 février 2016 11:17:54 UTC+1, malkowki_belgium a écrit : > > Hi all, > > I am working on the beagleboard xM using the Debian release 7.3 Wheezy , > and still using the old non DT Kernel Version 3.9.11-x5. > I have instantiated the PCA9535 in the board file (old method) attached to > the I2C2 BUs @400KHz, I have noticed that I cannot export correctly the > upper byte (bit 8 to bit 15) while everything works well for the lower ones. > Here the DMESG info I got while trying to toggle some IO from the Kernel > User Space using the sysf I/O debugger tools: > > [1629753.042938] export_store: status -16 > [1629753.043273] _gpio_request: gpio-233 (sysfs) status -16 > [1629753.043304] export_store: status -16 > [1629753.043609] _gpio_request: gpio-234 (sysfs) status -16 > [1629753.043701] export_store: status -16 > [1629753.044097] _gpio_request: gpio-235 (sysfs) status -16 > [1629753.044128] export_store: status -16 > [1629753.044464] _gpio_request: gpio-236 (sysfs) status -16 > [1629753.044494] export_store: status -16 > [1629753.045013] _gpio_request: gpio-237 (sysfs) status -16 > > any idea why I am getting such a message and why I always getting cat > /sys/class/gpio/gpioXX/ value :* 0 *while the IO is set as output and > echo "1" > /sys/class/gpio/gpioxx/export is set. > > I cannot decrypt this Kernel Message and I don't know from where to start > digging. > > the cat /sys/kernel/debug/gio tool shows the following: > GPIOs 232-247, i2c/2-0022, pca9535, can sleep: > gpio-232 (sysfs ) out lo > gpio-233 (sysfs ) out lo > gpio-234 (sysfs ) out lo > gpio-235 (sysfs ) out lo > gpio-236 (sysfs ) out lo > gpio-237 (sysfs ) out lo > gpio-238 (sysfs ) out lo > gpio-239 (sysfs ) out lo > gpio-240 (sysfs ) out lo > gpio-241 (sysfs ) out lo > gpio-242 (sysfs ) out lo > gpio-243 (sysfs ) out lo > gpio-244 (sysfs ) out lo > gpio-245 (sysfs ) out lo > gpio-246 (sysfs ) out lo > gpio-247 (sysfs ) out lo > > Thanks for any help! >
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