Seem focal:
$ uname -a
Linux rpi-cm4-rev1d0-e428 5.4.0-1034-raspi #37-Ubuntu SMP PREEMPT Mon Apr 12
23:14:49 UTC 2021 aarch64 aarch64 aarch64 GNU/Linux
$ sudo dmesg | grep rtc
[ 0.000000] Kernel command line: coherent_pool=1M 8250.nr_uarts=1
snd_bcm2835.enable_compat_alsa=0 snd_bcm2835.enable_hdmi=1 bcm2708_fb.fbwidth=0
bcm2708_fb.fbheight=0 bcm2708_fb.fbswap=1 smsc95xx.macaddr=DC:A6:32:D6:C8:D1
vc_mem.mem_base=0x3ec00000 vc_mem.mem_size=0x40000000 net.ifnames=0
dwc_otg.lpm_enable=0 root=LABEL=writable rootfstype=ext4 elevator=deadline
rootwait fixrtc console=tty1 console=ttyS0,115200 loglevel=8 quiet splash
[ 1.974818] hctosys: unable to open rtc device (rtc0)
[ 3.658840] rtc-pcf85063 10-0051: registered as rtc0
** Also affects: linux-raspi (Ubuntu Focal)
Importance: Undecided
Status: New
** Changed in: linux-raspi (Ubuntu Focal)
Status: New => Confirmed
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https://bugs.launchpad.net/bugs/1926911
Title:
hctosys not reading hardware clock on CM4
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