Finally I got ... the last hint from William Hermans indicated me something about the device name, which could be "rtcX", which made me execute: "ls -la /dev/rtc*":
root@beaglebone:~# ls -la /dev/rtc* lrwxrwxrwx 1 root root 4 May 21 2016 /dev/rtc -> rtc0 crw------- 1 root root 254, 0 May 21 2016 /dev/rtc0 1) Replace "rtc1" with "rtc0" in the commands and everything works! (the system date and time were already correct): hwclock -w -f /dev/rtc0 2) To test if it worked and if the date and time were actually adjusted, I changed the system time, restarted the BBB and disconnected it from the internet to ensure the date and time would not be auto-tuned. After restarting it, I checked if the system time was still wrong and then read the RTC time (which must be correct!). hwclock -r -f /dev/rtc0 It works!!! RTC date and time were correct. I don't even know how to thank everyone for their help. It should be simple to solve this problem, but it takes a lot of time, especially for those who don't have experience like me. Thank you very much! -- For more options, visit http://beagleboard.org/discuss --- You received this message because you are subscribed to the Google Groups "BeagleBoard" group. To unsubscribe from this group and stop receiving emails from it, send an email to beagleboard+unsubscr...@googlegroups.com. To view this discussion on the web visit https://groups.google.com/d/msgid/beagleboard/9c2b0a36-e70d-4fec-a904-6a0f6b5e0a49%40googlegroups.com. For more options, visit https://groups.google.com/d/optout.
