Sorry for the late reply, I haven’t had time to work on this.
I created a test application and deployed serial-test on it.
I did set:
RESIN_HOST_CONFIG_enable_uart = 1
TARGET_PORT = /dev/ttyS0
TARGET_BAUDRATE = 115200
TEST_CMD = test
Started to send rfid reads to the serial port and it didn’t work.
I did try TARGET_PORT = /dev/ttyAMA0 too with the same result.
So it must be something from cmdline.txt or config.txt
Edit:
I might be missing something basic…
I tried again using an untouched SDcard, downloaded from the serial test app and burned into the sd card, and it still did not work.
it is not a hardware problem, since if I use an SDcard with 1.x it works…