Artesyn COMX-P40x0 ENP2 Installation and Use (January 2015) - Manual (Page 108)

BSP
COMX-P40x0 ENP2 Installation and Use (6806800R95C) 108
For the GPIO signals connected to the I2C expander, these are controlled via the "i2c"
command using the I2C address = 0x18. For more information, see
I2C on page 110 .
7.12 UART
There are four universal asynchronous receiver/transmitters (UART) in the COMX-P40x0 ENP2
module, each with Tx and Rx signals routed to the COM-E connectors.
The default active console is UART0. The working mode is 115200baud rate, 8 data bit, No
parity, 1 stop bit. Each of the four UART can become the active console by setting the
environment variable "uart#".
The UART boot up message in U-Boot is as follows:
Usage:
UART0 - setenv uart# 0; saveenv; reset
UART1 - setenv uart# 1; saveenv; reset
UART2 - setenv uart# 2; saveenv; reset
UART3 - setenv uart# 3; saveenv; reset
In : Serial
Out : Serial
Err : Serial
Current Console: uart#0