Serial port on GPIO header simply does not work.
I put a 1GHz oscilloscope on it, while trying to send data. I could see maybe a 20mV variation, the TX signal was always high.
I disabled the serial console.
This was with the latest “Raspbian” image.
I also tried the Banana Pro Raspbian, that did not work either.
This has been delaying my review for about six weeks now…
The latest Raspbian image also does not have a kernel module for the on-board WiFi, but that worked with the Banana Pro image.