Proxmox Serial Console with efi boot

[ducs4rs]

What is the proper way to get host terminal output with efi boot? Do you add lines to /etc/kernel/cmdline similar to grub? IE
"console=ttyS1,115200n8 console=tty0"
"serial --speed=115200 --unit=1 --word=8 --parity=no --stop=1"

I can get this working using grub boot loader but not all the way with efi boot. My search skills might be poor since all the searches I do always bring up grub and nothing for efi..

 

[dcsapak]

here is the guide to editing the kernel commandline for grub and systemd-boot (efi): https://pve.proxmox.com/wiki/Host_Bootloader#sysboot_edit_kernel_cmdline

 

[ducs4rs]

here is the guide to editing the kernel commandline for grub and systemd-boot (efi): https://pve.proxmox.com/wiki/Host_Bootloader#sysboot_edit_kernel_cmdline

All well an good but the man page or this link says nothing about the parms needed for serial console output. Can you give an example on the lines needed to get it working. I've tried different iterations but can't get it to work.

 

[dcsapak]

oh i thought you only needed help setting the kernel parameters since you did get it to work on grub already?

this should work like any other debian/linux installation, e.g.:

https://forum.proxmox.com/threads/serial-port-on-host-to-proxmox-console.81045/
https://www.debian.org/releases/stable/i386/ch05s03.en.html

if it does not work, please describe exactly what you are doing and what does not work

 

[ducs4rs]

Again these instructions are for grub not efi boot. I am looking for a writeup on setting up efi boot since efi boot doesn't use /etc/default/grub

 

[dcsapak]

if you want the system to use the serial terminal after the kernel is loaded, the instructions should be the same, as in, you must give the kernel the correct parameters (either in grub or in systemd-boot like my first link described)

if you want the system to output to the serial console before the kernel loads, on efi this is a firmware/bios thing, and you should check your bios for a setting for this.