really thanks for reply!
Before all, I have to ask, is it necessary to flash one official image to eMMC before I use sdcard to boot?
Or I can boot this board using image on sdcard from a brand new board?
The method above shortcut GL-EN don’t work.
Let me describe the situation in detail. I tried this just before I post. (I can only upload 4 images now)
I have a CM3 board without flash any image into eMMC.
Then I flash “radxa-cm3-io-ubuntu-focal-server-arm64-20220501-0202-gpt.img” (2,000,000,000 bytes) into Samsung PRO Plus microSD card 128GB
this WaveShare CM4-IO-Base-A board works very fine with RPI CM4
but with Radxa CM3 board on with sdcard plugged in, it won’t boot and no serial output.
dim PWR and ACT light always on, also dim light on RJ45 port, no light on CM3 board
I also try CM3 on a working DFR0767 (a dual RJ45 board for RPI CM4), exactly same as above, dim ACT and PWR led and dim light on RJ45 port
Tried a lot power suppliers, like
UGreen CD226 all four port
and a non brand 5V 4A power supplier I used to power Jetson Nano
All these power supply works well on RPI 4B, FriendlyElec R2s/R4s, Rock PI 4B and CM4 on WaveShare CM4-IO-Base-A and DFR0767.
After all these, currently I prefer a got a broken CM3 board