[BPI-R3][BPI-R4] Does the BPI-R3/R4 have a RTC?

Banana Pi Router design
42

Just to make sure…you did start counting from 0 hrs after each round of power off & on and checking the kernel dmesg output?

I have UART (serial debug console) disconnected. Have two RJ45 plugged in. DC12V plugged in but powered off.

Maybe I should try with the two RJ45s unplugged…

43

Of course started from 0 after poweroff and swited off on my dc powercable…but i guess my serial adapter gives enough power to the rtc

44

Tested with all RJ45 unplugged. Cannot survive 5 hours.

So I think I reached my conclusion. My R4 and possibly production batch 3 & onwards can survive 4hrs+ but not passing 4.5 hrs.

Still very good.

45

Guys, need some help. I’m trying to play with RTC, but :

root@munich:~# cat /etc/modules.d/rtc-pcf8563
rtc-pcf8563
root@munich:~# hwclock
hwclock: can't open '/dev/misc/rtc': No such file or directory
root@munich:~#
root@munich:~# dmesg | grep rtc
[    5.746191] FIT:          flat_dt sub-image 0x0058a000..0x0058a11c "fdt-mt7988a-bananapi-bpi-r4-rtc" (ARM64 OpenWrt bananapi_bpi-r4 device tree overlay mt7988a-bananapi-bpi-r4-rtc)
root@munich:~# i2cdetect -y 1
     0  1  2  3  4  5  6  7  8  9  a  b  c  d  e  f
00:                         -- -- -- -- -- -- -- --
10: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
20: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
30: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
40: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
50: -- 51 -- -- -- -- -- UU -- -- -- -- -- -- -- --
60: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
70: UU -- -- -- -- -- -- --
46

Enable RTC on Banana Pi BPI-R4:

Source: