Serial Console
Output to Serial Console
Make sure the kernel is started with the following parameter…
console=ttyS0,115200
Dual Output
It is possible to have the kernel write to both the standard pseudo-terminal (tty0) and the serial console (ttyS0) by adding the following kernel parameters…
console=ttyS0,9600 console=tty0
View Console
It is possible to view serial console output using the screen command. With a USB-to-Serial adapter plugged in you may see a device called something like /dev/tty.usbserial-AG0JL5ZB that will act as the tty device.
screen /dev/tty.usbserial-AG0JL5ZB 115200,cs8,ixon
Parameters explained from man screen
| Parameter | Description |
|---|---|
| <baud_rate> | This affects transmission as well as receive speed (usually 300, 1200, 9600 or 19200) |
| cs8 or cs7 | Specify the transmission of eight (or seven) bits per byte |
| ixon or -ixon | Enables (or disables) software flow-control (CTRL-S/CTRL-Q) for sending data |
| ixoff or -ixon | Enables (or disables) software flow-control for receiving data |
| istrip or -istrip | Clear (or keep) the eight bit in each received byte |