Code:
root@ereader:/# cat /proc/tty/driver/serial
serinfo:1.0 driver:5.05c revision:2001-07-08
0: uart:PXA UART port:F8100000 irq:15 baud:19200 tx:3 rx:14006 RTS|CTS|DTR|DSR|CD|RI
1: uart:PXA UART port:F8200000 irq:14 baud:9600 tx:0 rx:0 CTS
2: uart:PXA UART port:F8700000 irq:13 baud:115200 tx:9406 rx:0 RTS|DTR
/dev/ttyS0 is the Wacom tablet, /dev/ttyS2 the hidden serial console... does anybody know what /dev/ttyS1 is about?