Unable to boot FreeBSD 11 (GRUB2, Multiboot).

I installed FreeBSD 11 on a GPT partition: sda7 for / with freebsd-ufs,sda5
for swap with freebsd-swap.I did not use any partition for /boot and the
installer did not ask.My root Partition is this: mounted under /mnt on
Linux.

4 drwxr-xr-x 2 root root 1024 Sep 29 02:44 bin
4 drwxr-xr-x 8 root root 1536 Dec 16 21:35 boot
8 -r--r--r-- 1 root root 6197 Sep 29 02:45 COPYRIGHT
4 drwxr-xr-x 2 root root 512 Dec 16 21:20 dev
4 -rw------- 1 root root 4096 Dec 16 21:35 entropy
4 drwxr-xr-x 25 root root 2048 Dec 16 21:35 etc
0 lrwxr-xr-x 1 root root 8 Dec 16 21:33 home -> usr/home
4 drwxr-xr-x 4 root root 1536 Sep 29 02:44 lib
4 drwxr-xr-x 3 root root 512 Dec 16 21:21 libexec
4 drwxr-xr-x 2 root root 512 Sep 29 02:43 media
4 drwxr-xr-x 2 root root 512 Sep 29 02:43 mnt
4 dr-xr-xr-x 2 root root 512 Sep 29 02:43 proc
4 drwxr-xr-x 2 root root 2560 Sep 29 02:44 rescue
4 drwxr-xr-x 2 root root 512 Sep 29 02:45 root
4 drwxr-xr-x 2 root root 2560 Sep 29 02:45 sbin
0 lrwxr-xr-x 1 root root 11 Sep 29 02:45 sys -> usr/src/sys
4 drwxrwxrwt 2 root root 512 Sep 29 02:43 tmp
4 drwxr-xr-x 16 root root 512 Dec 16 21:35 usr
4 drwxr-xr-x 24 root root 512 Sep 29 02:43 var

I configured GRUB2 (manages a multiboot,MultiOSs setup this way: 40_custom.

menuentry "FreeBSD 11" {
insmod ufs2
set root=(hd0,gpt7)
kfreebsd /boot/loader
}

GRUB2 tells me that "file /boot/loader not found" and I really don't know
because it seems everything correct.
 
Seems correct to me.

Have you checked if the loader was effectively installed ?
mount your gpt7 under /mnt and check:
Code:
ls -l /mnt/boot

Which Linux is ? some distro doesn't install ufs2 module when installing grub ... check your linux grub install for ufs2.mod
 
Hi i have a triple boot, arch linux with openrc, Funtoo and freebsd
my grub part of freebsd is like this:

Code:
menuentry "FreeBSD" {
insmod part_gpt
set root='(hd1,2)'
kfreebsd /boot/loader
 
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