Please delete the rk3568-can1-m0 for uEnv.txt
PENTA SATA HAT INSTALL FAILS on ROCK3a :-((
In boot/uEnv.txt removeed entry rk3568-can1-m0 ! from line Options=
Did so and then: 
sudo systemctl status rockpi-penta.service
[sudo] password for karl:
● rockpi-penta.service - Rockpi SATA Hat
Loaded: loaded (/lib/systemd/system/rockpi-penta.service; enabled; vendor p
reset: enabled)
Active: active (running) since Tue 2022-04-26 19:25:04 UTC; 1min
35s ago
Main PID: 905 (python3)
Tasks: 5 (limit: 8599)
Memory: 29.4M
CGroup: /system.slice/rockpi-penta.service
├─ 905 /usr/bin/python3 /usr/bin/rockpi-penta/main.py on
├─1254 /usr/bin/python3 /usr/bin/rockpi-penta/main.py on
├─1255 /usr/bin/python3 /usr/bin/rockpi-penta/main.py on
├─1257 /usr/bin/python3 /usr/bin/rockpi-penta/main.py on
└─1259 /usr/bin/python3 /usr/bin/rockpi-penta/main.py on
Apr 26 19:25:04 rock-3a systemd[1]: Started Rockpi SATA Hat.
Apr 26 19:25:05 rock-3a libmraa[905]: libmraa version v2
.1.0-20-g9ea5a29 initialised by user ‘root’ with EUID 0
Apr 26 19:25:05 rock-3a libmraa[905]: gpio: platform doe
sn’t support chardev, falling back to sysfs
Apr 26 19:25:05 rock-3a libmraa[905]: libmraa initialise
d for platform ‘Radxa ROCK 3 Model A’ of type 31
That finally did it Thx.
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