Just received the Carambola2 development board and tried to power up.
I hooked up the board's mini-usb port to Ubuntu PC

dmesg output:
[631255.930069] usb 3-2: Endpoint 1 MaxPacketSize 64
[631255.930071] usb 3-2: Endpoint 2 MaxPacketSize 64
[631255.930074] usb 3-2: Setting MaxPacketSize 64
[631255.930240] usb 3-2: FTDI USB Serial Device converter now attached to ttyUSB4

The terminal program connected to the USB-to-serial port successfully, but I didn't see any console message dumped to the terminal. Any hint to look for and debug further?

sudo picocom -b 115200 /dev/ttyUSB4
picocom v1.4

port is : /dev/ttyUSB4
flowcontrol : none
baudrate is : 115200
parity is : none
databits are : 8
escape is : C-a
noinit is : no
noreset is : no
nolock is : no
send_cmd is : ascii_xfr -s -v -l10
receive_cmd is : rz -vv

Terminal ready

Try to press enter