Hi im using fedora 25 on both a rasberrypi2 and a 3 I also have a ds1307 in the rasberrypi2 and it works fine. however ive tried first a ds1307 in the rasberry pi 3 and now a ds3231 neither show up in i2cdetect -y 0 or 1 or 2 i get messages as follows in dmesg dmesg | grep rtc [ 5.730955] hctosys: unable to open rtc device (rtc0) [ 22.881692] rtc-ds1307: probe of 2-0068 failed with error -5 [ 22.892945] rtc-ds1307: probe of 1-0068 failed with error -5 is there a problem with the pi3 and fedora25 and i2c im also getting about 600 after being on less than 2 hours: [ 1300.005255] i2c-bcm2835 3f805000.i2c: i2c transfer failed: 100 [ 1300.006707] i2c-bcm2835 3f805000.i2c: i2c transfer failed: 100 [ 1300.008158] i2c-bcm2835 3f805000.i2c: i2c transfer failed: 100 lsmod|grep i2c i2c_dev 16384 0 i2c_bcm2835 16384 0 if this is just something i need to wait for development , then thats fine, just want to be sure its not me. regards peter _______________________________________________ arm mailing list -- arm@xxxxxxxxxxxxxxxxxxxxxxx To unsubscribe send an email to arm-leave@xxxxxxxxxxxxxxxxxxxxxxx