Solved booting MacPro1,1 with 32bit EFI (not BIOS/Legacy)

balanga please re-read what has T-Daemon said above; he answered your question.

Let's say though your image is one of these: 13.2-RELEASE-i386-memstick.img. You do this:

Code: 
mkdir /a
mdconfig -a -t vnode -f FreeBSD-13.2-RELEASE-i386-memstick.img
gpart show md0
=>      1  2021584  md0  MBR  (987M)
        1  2021584    1  freebsd  [active]  (987M)

mount -t ufs /dev/md0s1a /a
echo new file > /a/afile
umount /a
mdconfig -d -u 0

It depends on what "img" is. Simplified: mdconfig creates a layer for you (backing store), you can mount it as if it was a disk and hence treat it as such.
Again, ".img" can be anything. But with these images it is exactly this.
 
balanga said:
How would you actually create the img file once you have change some file or other in the original image.
Click to expand...

You don't need to create a new image from a mdconfig(8) attached .img file.

After mounting and modifying the content of the installer image, just unmount and detach the memory disk. It's like plugging in a USB stick, mounting the file system, copying some files over, and unmounting it.

Code: 
# mdconfig -u 0 FreeBSD-memstick.img

Example mount root file system:
# mount /dev/md0s2a /mnt
# cp file /mnt/root
# umount /mnt

Example mount ESP file system:
# mount_msdosfs /dev/md0s1 /mnt
# cp /boot/loader.efi /mnt/efi/boot/bootx64.efi
# umount /mnt

# mdconfig -du 0

In case there are big files to copy over, the .img needs to be extended and the file system grown to fit before attaching it as a memory disk.
forums.freebsd.org

Create custom FreeBSD .img from original FreeBSD-13.0-RELEASE-amd64-memstick.img

Hello, I am looking at taking the original FreeBSD-13.0-RELEASE-amd64-memstick.img image file, mounting it, adding a few new .sh scripts, and then creating a new bootable .img file. I am changing nothing else... I have been able to mount the original .img using the following commands... $...
forums.freebsd.org forums.freebsd.org
 
Oh... I started another thread on this same topic. I installed OpenBSD but really want FreeBSD. OpenBSDs automatic partition layout is insane.
 
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