I see that the A20 has up to 8 UARTS available but only 3 have been included in the image.
I need 2 more so how much work is there needed to add these. I see from the datasheet that UART3 and UART4 are on GPIO1 as PG6,7 and PG10,11 so access to the signals is available.
Looking at the schematic, these pins are free for any use so I would assume that the only requirement would be to add them is drivers?
As I run Android, I am assuming the drivers for these reside within the Android Linux Kernel?
you need to change the fex file with the following entry
[uart_para3]
uart_used=1
.....
[uart_para4]
uart_used=1
.......