Miscellaneous Proxmox hack and tricks

Change BIOS console to serial using SeaBIOS

/etc/pve/qemu-server/.conf:

args: -M graphics=off

BIOS output after the Proxmox logo will be redirected to the serial terminal instead of the VGA emulated console. Useful for running OpenBSD with FDE as the unlock password prompt in OpenBSD cannot otherwise be routed to the serial console.

Configure an ISA Network card for use in DOS/FreeDOS

/etc/pve/qemu-server/.conf:

args: -netdev 'type=tap,id=net0,ifname=tap<machineid>i0' -device 'ne2k_isa,mac=xx:xx:xx:xx:xx:xx:xx,netdev=net0,bus=isa.0,iobase=0x300,irq=9,id=net0,bootindex=102'

Note: change the tag in the ifname= option to the numeric machine idand set a custom MAC address