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  1. I use image linux-image-current-meson64=20.02.8 5.4.28-meson64, kernel set by apt upgrade RTC battery connected. Try to perform setup by instruction seems nwclock can't work: lsmod|grep rtc rtc_meson_vrtc 20480 1 ls -l /dev/rt* lrwxrwxrwx 1 root root 4 Mar 30 18:28 /dev/rtc -> rtc0 crw------- 1 root root 252, 0 Mar 30 18:28 /dev/rtc0 hwclock hwclock: select() to /dev/rtc0 to wait for clock tick timed out root@droid:~# hwclock -w hwclock: ioctl(RTC_SET_TIME) to /dev/rtc0 to set the time failed: Invalid argument How to set hardware clock correctly? Previously I use earlier ubuntu-based armbian kernel 4.* on same device, and hardware clock woks. It brokes after swtching to a new image with new kernel.