NSA310S rtcwake (no replies)

It is possible u use rtcwake?
When:

# rtcwake -s 60 -m mem

or

# rtcwake -s 60

get this:

rtcwake: cannot open /sys/class/rtc/rtc0/device/power/wakeup: No such file or directory
rtcwake: /dev/rtc0 not enabled for wakeup events

I'm pretty sure that this was worked some time earler. Kernel 3.x or so.
Current kernel Linux NAS 5.5.1-kirkwood-tld-1 #1.0 PREEMPT Sat Feb 1 22:28:36 PST 2020 armv5tel bye the way.