c_tr

MIPS处理器的bootloader,龙芯就是用的修改过的PMON2

The tr Command
tr

The tr command selects transparent mode.

Format

The format for this command is:

tr [-2] [port]

where:

	-2 	Selects 2-port mode.
	port	Selects a specific port

Functional Description

The tr command selects transparent mode. In transparent mode, the Monitor copies any characters typed on the
keyboard to the selected port and then copies characters arriving at
the selected port to the screen.  This command can be used for two
different functions.