i've not done this myself, but
here they talk about an update to Minix 1.5, which runs on 68030 too.
not sure if the update is included, but the last distribution for amiga is available here:
http://www.minix3.org/previous-versions/index.html
missing link:
http://home.arcor.de/kickstart/TKA/T...IX/aminix.html