Grub Entry to Boot FreeBSD

[Thomas D. Dean]

On 6/3/21 4:10 AM, infoomatic wrote:
> May I suggest using UEFI? With UEFI you can install refind, and in the
> EFI partition there is a refind.conf where you can edit the default boot
> option. Its really simple to setup and work with, the only small issue
> is with an update on the Linux side it changes the efi boot order, but
> with efibootmgr you can change it back...

I am willing to use grub, since it is already installed.  I do not want 
additional, unknown code.

> 
> 
> On 02.06.21 06:10, Thomas D. Dean wrote:
>> I have a remote system with Linux and FreeBSD.  I want to select the
>> next boot OS at runtime and boot it.
>>
>> I can do that with
>>     grub-set-default 'Ubuntu'
>>     -or-
>>     grub-set-default 'FreeBSD'
>> and reboot.
>>
>> My problem is with the FreeBSD entry.  How do I write the entry?
>>
>> The disks are:
>>    NAME        MAJ:MIN RM   SIZE RO TYPE MOUNTPOINT
>> nvme0n1     259:0    0 931.5G  0 disk
>> |-nvme0n1p1 259:4    0   512M  0 part /boot/efi
>> `-nvme0n1p2 259:5    0   931G  0 part /
>> nvme1n1     259:1    0 931.5G  0 disk
>> `-nvme1n1p1 259:3    0 931.5G  0 part
>> nvme2n1     259:2    0 931.5G  0 disk
>> |-nvme2n1p1 259:6    0   512K  0 part
>> |-nvme2n1p2 259:7    0   928G  0 part
>> `-nvme2n1p3 259:8    0   3.5G  0 part
>>
>> /dev/nvme0n1p2: UUID="55626001-0033-445b-bd2b-0bf4766e25bb" TYPE="ext4"
>>     PARTUUID="2b247e80-cf2e-4be1-b6d7-61152af7132f"
>> /dev/nvme0n1p1: UUID="7076-258D" TYPE="vfat" PARTLABEL="EFI System
>>     Partition" PARTUUID="16a50609-64b2-47ad-8802-c3cbb4be263f"
>> /dev/nvme1n1p1: UUID="e26e4bf7-6e65-4fac-b2b4-f84019f70c08" TYPE="ext4"
>>     PARTUUID="beccec5f-01"
>> /dev/nvme2n1p1: PARTUUID="3fed2b68-c26f-11eb-a073-18c04d84849a"
>> /dev/nvme2n1p2: UUID="60b57d7bd4b24f00" TYPE="ufs"
>>     PARTUUID="3fed7a4f-c26f-11eb-a073-18c04d84849a"
>> /dev/nvme2n1p3: PARTUUID="3fedfa22-c26f-11eb-a073-18c04d84849a"
>>
>> Device              Start        End    Sectors  Size Type
>> /dev/nvme2n1p1         40       1063       1024  512K FreeBSD boot
>> /dev/nvme2n1p2       1064 1946157095 1946156032  928G FreeBSD UFS
>> /dev/nvme2n1p3 1946157096 1953525127    7368032  3.5G FreeBSD swap
>>
>> Ubuntu  is on nvme0n1, or, I think hd0,1 in grub terms.
>> FreeBSD is on nvme2n1, or, I think hd2,2
>>
>> But, grub thinks hd2 is just hd2 or hd2,msdos1
>>
>> I have
>>> cat /etc/grub.d/40_custom
>> #!/bin/sh
>> exec tail -n +3 $0
>> # This file providesan easyway toadd custom menu entries.Simply type the
>> # menu entries youwant toadd after this comment.Be careful not to change
>> # the 'exec tail' line above.
>> menuentry 'FreeBSD' {
>>    insmod ufs2
>>    set root=(hd2,2)
>>    chainloader /boot/loader.elf
>> }
>>
>> I tried
>> menuentry 'FreeBSD' {
>>      insmod ufs2
>>      set root=(hd2,1,a)
>>      search --no-floppy -fs-uuid --set
>> 3fed2b68-c26f-11eb-a073-18c04d84849a
>>      kfreebsd /boot/loader
>> }
>>
>> When I reboot after grub-set-default 'FreeBSD', the remote system
>> hangs.  Grub can not find hd2.
>>
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