less /proc/tty/driver/OMAP-SERIAL
serinfo:1.0 driver revision:
0: uart:OMAP UART0 mmio:0x4806A000 irq:72 tx:3 rx:0 CTS|DSR|CD|RI
1: uart:OMAP UART1 mmio:0x4806C000 irq:73 tx:3 rx:3 DSR|CD|RI
2: uart:OMAP UART2 mmio:0x49020000 irq:74 tx:5872 rx:479 RTS|CTS|DTR|
DSR>CD>RI
3: uart:OMAP UART3 mmio:0x49042000 irq:80 tx:5 rx:1 brk:1 CTS|DSR|CD|
RI
It seems like UART2 is related to the db9 connector onboard... and not
the mux port!