RS232 Terminal configuration
From ArmadeusWiki
Serial Terminal configuration
You will need a Serial terminal emulator to communicate with U-Boot/Linux console. You can choose between:
We suggest you to use Kermit as Terminal emulator. Minicom was sadly reported to have problems when communicating with U-Boot (ZModem data transfer). If you just need a simple serial console and not to transfer data through the serial link, then GTKTerm is the perfect choice ! (gtkterm package in Ubuntu)