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Story: I have used armbian-config to check Hardware (if my I2C bus is enabled). I have noticed very strange behavior of function: grep was outputted in "usage" mode. I revieved all the scripts and it appeared that line which is searching for "overlays=" is throwing this error. My /boot/armbianEnv.txt didn't have any overlay, especially for I2C, enabled. So, I have added as following (+ overlay prefix):
 
[root@PKTEST ~]# cat /boot/armbianEnv.txt rootdev=UUID=f8301761-6756-4f97-aa80-12c05ea037cf extraargs=pty.legacy_count=2 overlays=i2c0 i2c1 i2c2 user_overlays=ds1307 overlay_prefix=sun8i-h3 usbstoragequirks=0x2537:0x1066:u,0x2537:0x1068:u,0x1058:0x10b8:u [root@PKTEST ~]#  
Then I have modified my user overlay file to be as following:
 
[root@PKTEST ~]# cat /boot/overlay-user/ds1307.dts /dts-v1/; /plugin/; / { compatible = "allwinner,sun4i-a10", "allwinner,sun7i-a20", "allwinner,sun8i-h3", "allwinner,sun50i-a64", "allwinner,sun50i-h5"; /* * Aliases can be used to set the external RTC as rtc0 * Needs supplying the correct path to the I2C controller RTC is connected to, * this example is for I2C1 on H3 * NOTE: setting time at boot by the kernel * may not work in some cases if the external RTC module is loaded too late */ fragment@0 { target-path = "/aliases"; __overlay__ { rtc0 = "/soc/i2c@1c2ac00/ds1307@68"; }; }; fragment@1 { target = <&i2c0>; __overlay__ { #address-cells = <1>; #size-cells = <0>; ds1307@68 { compatible = "dallas,ds1307"; reg = <0x68>; status = "okay"; }; }; }; }; [root@PKTEST ~]#  
The address in fragment@0 is determined by looking where system placed i2c0 bus (I am sure that my RTC is connected to bus 0).
 
It is giving /dev/rtc1,m which I have verified as following:
 
[root@PKTEST ~]# ll /dev/rtc* crw------- 1 root root 253, 0 May 22 2016 /dev/rtc0 lrwxrwxrwx 1 root root 4 May 22 2016 /dev/rtc -> rtc0 crw------- 1 root root 253, 1 May 22 2016 /dev/rtc1 [root@PKTEST ~]# hwclock -r -f /dev/rtc0 Sun 22 May 2016 12:38:25 AM CEST -1.593015 seconds [root@PKTEST ~]# hwclock -r -f /dev/rtc1 Fri 05 Oct 2018 11:57:03 AM CEST -0.927469 seconds [root@PKTEST ~]#  
Unfortunately it seems that line frogment@0 is not making this device available as rtc0 (it is assigning rtc1):
 
[root@PKTEST ~]# dmesg | grep -i rtc [ 3.636229] [drm] Cannot find any crtc or sizes [ 3.756932] sun6i-rtc 1f00000.rtc: rtc core: registered rtc-sun6i as rtc0 [ 3.756939] sun6i-rtc 1f00000.rtc: RTC enabled [ 4.641465] [drm] Cannot find any crtc or sizes [ 9.740172] rtc-ds1307 0-0068: /aliases ID 0 not available [ 9.741555] rtc-ds1307 0-0068: registered as rtc1 [root@PKTEST ~]#  
Can anybody help and answer if it is possible somehow "override" the device? Of course I have my own systemd script to use it and set correct date at boot time. If "overriding" is not possible then I will use it.
 
 
 

For me it did. On all of my boards (Opi+2e, Opi+2, OpiPC, OpiZero) I was trying:
 
stable "next" nightly "next" Unfortunately it failed (sometimes I was able to get some exceptions in logs, example of one of them is here:
 
 
So I went back to "default" (stable). And on all boards - no issues.