RTC not working on PijuiceZero with Raspberry Pi OS Lite 64 bit bookworm

[mroelandts]

Hello,

Device: Pi zero 2 + PiJuice zero
Firmware: V1.6
OS: 2023-12-11-raspios-bookworm-arm64-lite
Connected devices: Pijuice zero 1200mAh battery

I'm having some issues with the RTC on my latest setup.
According to the rtc documentation the i2c-rtc module should automatically load.
But even while forcing it by adding dtoverlay=i2c-rtc,ds1339 in /boot/config.txt does not enable it.
I do not get an ‘UU’ at address 68.

$ i2cdetect -y 1
     0  1  2  3  4  5  6  7  8  9  a  b  c  d  e  f
00:                         -- -- -- -- -- -- -- -- 
10: -- -- -- -- 14 -- -- -- -- -- -- -- -- -- -- -- 
20: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- 
30: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- 
40: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- 
50: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- 
60: -- -- -- -- -- -- -- -- 68 -- -- -- -- -- -- -- 
70: -- -- -- -- -- -- -- --   

$ ll /dev | grep i2c
crw-rw---- 1 root i2c      89,   1 Nov 10 01:25 i2c-1
crw-rw---- 1 root i2c      89,   2 Nov 10 01:25 i2c-2

$ uname -m
aarch64

The EEPROM address is set to 50. (default)

The command lsmod | grep rtc also returns nothing, which makes me believe the module is not loaded.
Should I activate a different module for bookworm (64bit)?
I do have a working setup, but this one is running the bullseye build of raspberry OS Lite with dtoverlay=i2c-rtc,ds1339 inside the /boot/config.txt.
(cat /etc/debian_version -> 11.3 && uname -mm -> armv7l)

First I had some issues with the i2c module not activate: see PiJuice/issues/1062 but raspi-config fixed that.
Any help is much appreciated!
If more information is needed, please clarify.

[tvoverbeek]

I tried to reproduce your problem using a Pi zero 2 and the Pijuice HAT.
Installing raspios 64-bit lite with the imager results in the same version as yours. After an sudo apt update; sudo apt -y upgrade I get version 2024-01-25.
With both the imager version and the 2024-01-25 version the pijuice-base package installs fine.
I even get the UU for address 68 in i2cdetect.

Have you tried manually loading the rts_ds1307 module (sudo modprobe rtc_ds1307)?
lsmod should ahow both rtc_1307 and regmap_i2c

[mroelandts]

What do you mean with "the 2024-01-25 version"? Are you taking about the raspberry os or the pijuice-base package?
For the OS I'm unable to locate a newer version than 2023-12-11-raspios.
And for pijuice-base, I can only see the apt version, which is 1.8.

Using the PiImager, once I select the zero 2 as device, I'm unable to select the bookworm 64 bit OS using the official images (Imager v1.8.5). Selecting a different device, allows me to select it. Weird, but that's a different issue...
I have created my sd card using the downloaded file from https://www.raspberrypi.com/software/operating-systems/ and balenaEtcher.

Manually loading the module has no effect on my existing system.

$ sudo modprobe rtc-ds1307 

$ lsmod
Module                  Size  Used by
rtc_ds1307             28672  0
regmap_i2c             16384  1 rtc_ds1307
brcmfmac              327680  0
vc4                   364544  2
snd_soc_hdmi_codec     20480  1
drm_display_helper     16384  1 vc4
cec                    53248  1 vc4
brcmutil               24576  1 brcmfmac
drm_dma_helper         20480  1 vc4
drm_kms_helper        212992  4 drm_dma_helper,vc4
cfg80211              950272  1 brcmfmac
snd_soc_core          282624  2 vc4,snd_soc_hdmi_codec
snd_compress           20480  1 snd_soc_core
binfmt_misc            20480  1
snd_pcm_dmaengine      20480  1 snd_soc_core
fb_sys_fops            16384  1 drm_kms_helper
syscopyarea            16384  1 drm_kms_helper
raspberrypi_hwmon      16384  0
sysfillrect            16384  1 drm_kms_helper
sysimgblt              16384  1 drm_kms_helper
bcm2835_isp            28672  0
bcm2835_codec          49152  0
bcm2835_v4l2           45056  0
snd_bcm2835            28672  0
v4l2_mem2mem           40960  1 bcm2835_codec
bcm2835_mmal_vchiq     36864  3 bcm2835_codec,bcm2835_v4l2,bcm2835_isp
videobuf2_vmalloc      16384  1 bcm2835_v4l2
rfkill                 32768  4 cfg80211
snd_pcm               143360  5 snd_bcm2835,snd_soc_hdmi_codec,snd_compress,snd_soc_core,snd_pcm_dmaengine
videobuf2_dma_contig    20480  2 bcm2835_codec,bcm2835_isp
videobuf2_memops       16384  2 videobuf2_vmalloc,videobuf2_dma_contig
videobuf2_v4l2         32768  4 bcm2835_codec,bcm2835_v4l2,v4l2_mem2mem,bcm2835_isp
videobuf2_common       69632  8 bcm2835_codec,videobuf2_vmalloc,videobuf2_dma_contig,videobuf2_v4l2,bcm2835_v4l2,v4l2_mem2mem,videobuf2_memops,bcm2835_isp
videodev              282624  6 bcm2835_codec,videobuf2_v4l2,bcm2835_v4l2,videobuf2_common,v4l2_mem2mem,bcm2835_isp
snd_timer              40960  1 snd_pcm
mc                     61440  6 videodev,bcm2835_codec,videobuf2_v4l2,videobuf2_common,v4l2_mem2mem,bcm2835_isp
snd                   110592  6 snd_bcm2835,snd_soc_hdmi_codec,snd_timer,snd_compress,snd_soc_core,snd_pcm
vc_sm_cma              32768  2 bcm2835_mmal_vchiq,bcm2835_isp
raspberrypi_gpiomem    16384  0
joydev                 28672  0
uio_pdrv_genirq        16384  0
uio                    24576  1 uio_pdrv_genirq
i2c_dev                20480  2
drm                   593920  5 drm_kms_helper,drm_dma_helper,vc4,drm_display_helper
fuse                  143360  1
drm_panel_orientation_quirks    28672  1 drm
dm_mod                143360  0
backlight              24576  1 drm
ip_tables              32768  0
x_tables               49152  1 ip_tables
ipv6                  561152  26
i2c_bcm2835            20480  1

$ i2cdetect -y 1
     0  1  2  3  4  5  6  7  8  9  a  b  c  d  e  f
00:                         -- -- -- -- -- -- -- -- 
10: -- -- -- -- 14 -- -- -- -- -- -- -- -- -- -- -- 
20: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- 
30: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- 
40: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- 
50: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- 
60: -- -- -- -- -- -- -- -- 68 -- -- -- -- -- -- -- 
70: -- -- -- -- -- -- -- --                         

$ sudo hwclock -rv
hwclock from util-linux 2.38.1
System Time: 1708455574.125568
Trying to open: /dev/rtc0
Trying to open: /dev/rtc
Trying to open: /dev/misc/rtc
No usable clock interface found.
hwclock: Cannot access the Hardware Clock via any known method.

I also created a new sd card with the 64 bit bullseye OS system.
I even used a different zero2 and different pijuice zero.
All resulted in the same behavior as above.

BUT using the 32bit bullseye && 32 bit bookworm OS did work! It did not auto load, but after editing the /boot/config.txt and rebooting again, I was able to use sudo hwclock -r.
Does the pijuice zero board not support a 64bit system? Or is it something in the pijuice-base (v1.8) package that does not support it?

Are you positive that you used the 64-bit lite OS to reproduce this issue?
I'm able to reproduce it multiple times using multiple zero2 and pijuice zero boards.
If not, I'm out of ideas :)

[tvoverbeek]

@mroelandts You wrote:
What do you mean with "the 2024-01-25 version"? Are you taking about the raspberry os or the pijuice-base package?
After running sudo apt update and sudo apt -y upgrade the output of uname -a is:

tvo@pi02-test:~ $ uname -a
Linux pi02-test 6.1.0-rpi8-rpi-v8 #1 SMP PREEMPT Debian 1:6.1.73-1+rpt1 (2024-01-25) aarch64 GNU/Linux
tvo@pi02-test:~ $ 

Note: You can use the Raspberry Pi Imager to download the 64-bit bookworm-lite for the Pi02 by selecting "No filtering" as device.
The problem with the PiJuice Zero is that it is not a proper HAT. It does not have an EEPROM, so the configuration (Enabling I2C and loading the rtc driver and /dev/rtc) has to be done by hand.
I'll describe how I did it tomorrow.
The end result:

tvo@pi02-test:~ $ sudo hwclock -rv
hwclock from util-linux 2.38.1
System Time: 1708639599.513575
Trying to open: /dev/rtc0
Using the rtc interface to the clock.
Assuming hardware clock is kept in UTC time.
Waiting for clock tick...
ioctl(4, RTC_UIE_ON, 0): Invalid argument
Waiting in loop for time from /dev/rtc0 to change
...got clock tick
Time read from Hardware Clock: 2024/02/22 22:06:40
Hw clock time : 2024/02/22 22:06:40 = 1708639600 seconds since 1969
Time since last adjustment is 1708639600 seconds
Calculated Hardware Clock drift is 0.000000 seconds
2024-02-22 23:06:39.507732+01:00
tvo@pi02-test:~ $ 

[tvoverbeek]

@mroelandts Here the continuation of yesterday.
Same hardware configuration as you: Pi02W, PiJuice Zero with 1200mAh battery.
Installed Raspberry Pi Os Lite with the Imager (Customizing User, Password, Wifi, Localization and enable SSH)
After first run sudo apt update and sudo apt -y upgrade
Enabled I2C via raspi-config.
installed i2c-tools (for i2cdetect)
With PiJuicd Zero + battery connected, i2cdetect gives a response for addresses 14 and 68
Load the i2c-rtc device tree overlay dynamically: sudo dtoverlay i2c-rtc ds1307
Check that /dev/rtc exists: ls -l /dev/rtc*
Running i2cdetect now give 'UU' for address 68.
Also sudo hwclock -rv now works. (See previous post).
After a reboot the overlay is gone and you do not get the rtc
Adding the line dtoverlay=i2c-rtc,ds1307 to /boot/firmware/config,txt and an other reboot makes it permanent.