How to show ZFS Boot Menu on a SOL console?

[markmcb]

I have a Supermicro X12STH-F motherboard with Serial Over LAN (SOL). I can use the kernel parameters org.zfsbootmenu:commandline="console=tty1 console=ttyS1,115200n8" with ZBM and see everything once the Linux boot process starts, but I can't see the actual ZBM menu without launching the web-based console (which reports tty1).

With GRUB, I do the following to see the GRUB menu with SOL:

GRUB_CMDLINE_LINUX="console=tty1 console=ttyS1,115200n8"
GRUB_TERMINAL=serial
GRUB_SERIAL_COMMAND="serial --speed=115200 --unit=1 --word=8 --parity=no --stop=1"

Is there an equivalent to see the ZBM menu?

[classabbyamp]

you can use zbm-kcl (docs) to edit the kernel commandline of ZBM itself if using the prebuilt image. If building your own image, it can be set in the config file for generate-zbm.

[zdykstra]

The last console= argument on the ZFSBootMenu KCL is what will receive the menu output - there can be only one active local (physical) output for ZFSBootMenu.

[markmcb]

Ah, ok. I installed on Gentoo with:

curl -L https://get.zfsbootmenu.org/efi -o /efi/EFI/BOOT/BOOTX64.EFI
efibootmgr -c -d ${STORAGE_DEV} -p 1 -L "ZFSBootMenu" -l \\EFI\\BOOT\\BOOTX64.EFI

Doesn't look like there's anything available in the ports tree to get the zbm-kcl binary, so I guess I need to build that on my own. Thanks for the help.

[ahesford]

It's a shell script. Just grab it from https://get.zfsboot.menu or bin/zbm-kcl in this repo.

[markmcb]

Thanks for the help, just to write up exactly what I did in case someone else finds this:

# Get the tool
wget https://get.zfsboot.menu/zbm-kcl
chmod +x zbm-kcl

# Review current value
./zbm-kcl /efi/EFI/BOOT/BOOTX64.EFI

# Edit
./zbm-kcl -e /efi/EFI/BOOT/BOOTX64.EFI

And in my edit I put console=ttyS1,115200n8 at the end of the line. Worked as expected.