[9fans] Can't boot from img

[kuroutadori]

I have an iMac G3, and decided I was going to abuse it. I have so, I
am able to boot Linux and NetBSD from CD, but I can't boot from Plan
9. I did have a go at just booting the .img file from Open Firmware,
but it's not supported. What do I have to do, to get Plan 9 to boot
from disc? Can I use NetBSD somehow to boot the image?