Dual booting Linux and FreeBSD on a single drive

[Andrey Lanin]

I could check if the EFI file are in my efi partition ?

cat /boot/grub/grub.cfg | grep freebsd

 

[sudobsd]


root@adam-HP-Notebook:/home/adam# cat /boot/grub/grub.cfg | grep freebsd
menuentry "freebsd" {



 

[Andrey Lanin]

Oh and how do i do that ?

In some cases (depend of Linux OS) sudo -E ..., but better run in root terminal


root@adam-HP-Notebook:/home/adam# cat /boot/grub/grub.cfg | grep freebsd
menuentry "freebsd" {



Ok. Try reboot.

 

[sudobsd]

ok, im gonna reboot, and im gonna see if i can boot to freebsd or grub wants to reboot the machine so it can detect freebsd.

 

[sudobsd]

Ok so i rebooted the computer, and it seems to only boot to linux, no selection screen.

 

[Andrey Lanin]

and now what do i do ?

update-grub says: "Warning: os-prober will not be executed to detect other bootable partitions."

Is it normal ?

add GRUB_DISABLE_OS_PROBER=false to /etc/default/grub and run ./a.sh again, and then reboot

 

[sudobsd]

"Found unknown linux distrbution at /dev/sda3"

That actually a good sign, i was also thinking about mounting the freebsd partition but it fails miserably.

 

[sudobsd]

I could try to reboot maybe ?

 

[Andrey Lanin]

Yes

 

[sudobsd]

Ok so GRUB may have detected FreeBSD, but the menu to select what OS to boot does not appear, its boots back to Linux.

 

[sudobsd]

Hmm, i don't know, i guess i could try to mount the freebsd partition, and try to do update-grub

 

[Andrey Lanin]

"Found unknown linux distrbution at /dev/sda3"

Instea, it should output something like this

Found FreeBSD 13.1-RELEASE-p1 on /dev/sda3

 

[sudobsd]

Instea, it should output something like this

Found FreeBSD 13.1-RELEASE-p1 on /dev/sda3

Yeah i don't know, its really weird.

 

[Andrey Lanin]

i guess i could try to mount the freebsd partition,

No.

try to do update-grub

Yes

Did you add GRUB_DISABLE_OS_PROBER=false to /etc/default/grub ?
If yes, run ./a.sh and reboot

 

[sudobsd]

so how can i show GRUB selection menu, because this confuses me.

 

[sudobsd]

Yes i did

 

[sudobsd]

I think that the EFI file is not the same i have as yours. It probably has a different file name.

 

[sudobsd]

i could try this:
menuentry "FreeBSD" {
insmod ufs2
search --file --set root --no-floppy /boot/loader.efi
chainloader /boot/loader.efi

Maybe it would work ?

 

[sudobsd]

ok no its doesnt work: plus it shows that:

 

[sudobsd]

Welp, i guess this is going nowhere, i can't configure GRUB. im gonna try to boot to FreeBSD from the BIOS which means spamming the ESC key when booting the computer, or when i wanna boot to FreeBSD

 

[Andrey Lanin]

What the output of lsblk -f /dev/sda3 ?

 

[sudobsd]

 

[Andrey Lanin]

It is correct. I give up.
I can suggest to try edit 40_custom as follows (but that is bad idea):

menuentry "freebsd" {
    insmod part_gpt
    insmod ufs2
    set root='hdX,gptY'
    chainloader /boot/loader_4th.efi
}
where X count from 0, Y count from 1
gptY - where FreeBSD's '/' is placed

 

[sudobsd]

Welp, its the end then.

Thanks for helping me anyways, i'll probably migrate to Arch Linux.

 

[Andrey Lanin]

Is /dev/sda3 mounted? umount it and try again