How was the boot1.hfs file created?

[Super Bisquit]

I'd like to try the same for booting NetBSD and OpenBSD.
I've mounted the file and see that there is a ppc folder. Contained in the
file is the bootloader and a text info file.
I'm assuming the same can be done with Net/Open BSD using ofwboot.elf and
ofwboot.xcf.
The working system is linux:
I've used dd to create the 800(819)k image and have tried formatting using
hformat.
Now, I have a laptop with FreeBSD x86 on it and I can reinstall FreeBSD-ppc
on this- G4 Powermac- machine and create the boot volume here.