GRUB menu entry in multiboot USB

[alexanderzhirov]

Hello everyone! I want to add ISO to a multiboot disk. Can you please tell me how to set up entries in GRUB correctly?

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menuentry "GhostBSD 24.07.1 XFCE" --class freebsd {
    insmod iso9660
    set isofile="/GhostBSD-24.07.1-XFCE.iso"
    loopback loop $isofile
    kfreebsd (loop)/boot/kernel/kernel
    kfreebsd_module (loop)/boot/mfsroot.gz type=mfs_root
}

Of the known data, I only have the name of the device

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(hd0,2)

and the file

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GhostBSD-24.07.1-XFCE.iso

which is located in the root of this device.

The current configuration of entries does not allow booting from USB into ISO.