Configure gxemul and run OpenBSD luna88k on FreeBSD

gxemul runs best on the *BSD operating systems. I use FreeBSD 14. My configuration uses the tap device on the FreeBSD side.

• Install package gxemul: pkg install gxemul
• Add the following lines to /etc/rc.conf:

   cloned_interfaces="bridge0 tap0"
   autobridge_interfaces="bridge0"
   autobridge_bridge0="tap0 em0"
   ifconfig_bridge0="DHCP"

• Add the following line to /etc/sysctl.conf

   net.link.tap.up_on_open=1

• Download the following files from the live image provided by Kenji Aoyama:
  • boot
  • liveimage-luna88k-raw-20231016.img.gz (or the file with newer time stamp)
• Create a config file lunam88k.cfg with the following content:

net(
        tapdev("/dev/tap0")
)
machine(
        type("luna88k")
        subtype("luna-88k")
        disk("liveimage-luna88k-raw-20231016.img")
        load("boot")
)

• You can then start OpenBSD with the command:

  gxemul @ lunam88k.cfg

• Login to OpenBSD
  • Enable sshd by comment out the line sshd_flags=NO in file rc.conf.local
  • Configure network by changing the content of file /etc/hostname.le0 to inet autoconf

You are now able to boot OpenBSD/lunam88k and ssh into it.