I guess in other words, if you had a 68000 processor
with some
attached RAM and a random UART (6551 or Z8530 or 8250/16450/16550),
what else might you need to bring up CP/M-68K?
A mass storage device with CP/M bits on it with the right BIOS.
Since there are disc images and a boot prom for the Sage, I thought
it would be the easiest way to go. The alternative would be to bootstrap
it through cross-development tools, since all the sources are available.