That means the uboot pull the GPS’s power enable pin to high by default. So the GPS serial output mess up the uboot. The system image I used was ported by Rex and it won’t pull that pin to high by default. I can’t recall the version, I may check it later.
I did measured the fifth pin of GP-02, supposed to be power on, and got a constant high level once I power on the system.
Please measure the voltage between these two points. And please tell me which version of your Radxa image you’re using. Since you are using WeChat, you can DM me with your WeChat number, and we can continue there.
Thumbs up to @vileer for the addition of a FULL USB3 port to the Hackergadgets AIOv3. I was backing up my 256Gb NVMe to a (bootable) Sandisk Extreme pro micro sd card using the ClockworkPi USB-A socket and the ‘SD card copier’ in Rex’s Trixie build. Quite slow and painful, sd card got quite hot too.
Now via a second adaptor into the AIOv2 USB3 socket the backup is taking 1/3rd of the time !, far less painful…