Appendix A Configuring and Using a Serial Console

Before the Linux operating system (OS) is booted, all console interaction occurs through EFI. To modify the default local graphics display to be a serial console path, you must configure a single serial port (UART) for both Console-In/Out in the EFI boot manager. This configuration allows the Linux kernel to interpret the UART as ttyS0 on system boot sending output to the selected display screen.