I know the A20 SBC supports 8 UART interfaces, a 3 are available on the Debug, UEXT1 and UEXT2 connectors. Some I assume are use for USB. So my question is, how many are available for use through the GPIO-1, GPIO-2 and GPIO-3 interfaces, and where do they appear? The A20-OLinuXino-MICRO user guide only talks in terms of Pxn signal names and processor pin numbers.
In case no-one happens to know, you can get the datasheet and look up the answer. It's on Olimex site and linux-sunxi site and net generally.
John