grub-uefi-dualboot-40_custom error

S

SingerMan

Greetings: I would appreciate some insight on this issue:

Fedora41-Server & Freebsd 13.4 booting on 1 disk from an efi partition.
I installed BSD 1st

Booting via the hot key F8 -- both OSes are found & boot correctly.
If I let the grub2 load, it displays the menu with Freebsd but only boots Fedora
The grub menu error shown for FreeBSD is: “ error: .. /../../grub-core/fs/fs...”

(Yes, I ran grub2-mkconfig after each change )

I have readily installed this linix/BSD combo several times with several different mobo/cpu combos as mbr-boot -- it has always worked well even triple-booting with 2 BSD versions on 1 drive.

Pertinent info:

Code: 
40 468862055 ada0 GPT (224G)
40 532480 1 efi (260M)
532520 115343360 2 freebsd-ufs (55G)
115875880 88080384 4 freebsd-ufs (42G)
203956264 2008 - free - (1.0M)
203958272 2097152 5 !bc13c2ff-59e6-4262-a352-b275fd6f7172 (1.0G)
206055424 117440512 6 !4f68bce3-e8cd-4db1-96e7-fbcaf984b709 (56G)
323495936 87883776 7 !933ac7e1-2eb4-4f13-b844-0e14e2aef915 (42G)
411379712 49993768 - free - (24G)
461373480 7488608 3 freebsd-swap (3.6G)
468862088 7 - free - (3.5K)

$ sudo ls /boot/efi/efi
boot fedora freebsd
$ sudo ls /boot/efi/efi/boot
bootx64.efi fbx64.efi loader.efi
$ sudo ls /boot/efi/efi/fedora
BOOTX64.CSV grub.cfg grubx64.efi mmx64.efi shim.efi shimx64.efi
$ sudo ls /boot/efi/efi/freebsd
bootx64.efi loader.efi

menuentry 'FreeBSD 13.4' {
insmod part_msdos
insmod xfs
insmod ufs2
set root='(hd0,gpt2)'
kfreebsd boot/loader.efi
}
I’ve tried a dozen conbos in the last line of 40_custom such as:
kfreebsd /boot/loader & chainloader /boot...etc

Anything jump out? Thanks
 
SingerMan said:
I’ve tried a dozen conbos in the last line of 40_custom such as:
kfreebsd /boot/loader & chainloader /boot...etc
Click to expand...
Target the ESP's root filesystem and chainload loader.efi(8), i.e.:
Code: 
chainloader (hd0,gpt1)/efi/freebsd/loader.efi
or
Code: 
set root=(hd0,gpt1)
chainloader /efi/freebsd/loader.efi

If in doubt how the grub menu entry should look like, boot https://www.supergrubdisk.org/, enter "Detect and show boot methods", choose entry, enter edit mode by pressing "e".
 
Hi T-Daemon, thank you for your suggestions.

As shown in code I included above, the FreeBSD root (sda2) is pointed to in ”set root ”

I tried your suggestion "chainloader (hd0,gpt1)/efi/freebsd/loader.efi"

This time -- instead of hanging forever at the error: “ error: .. /../../grub-core/fs/fshelp....”
after ~ 8-10 seconds it boots -- I'd stll like to know why I'm getting that error -- it seems to be connected to some help file it's not finding. Needing to also directly reference the efi partition path in 40_custom is new to me --it's not been necessary using mbr-boot. But it is booting from grub2 now. Thank you!
 
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