how to gentoo-portage on a new architecture ?

[ddc]

hi,
how to gentoo-portage on a new architecture ?

i mean, if
- i buy an embedded board with pci (example walnut-ppc405)
- i use an unsupported board (example apple mac classic 68k, supported by netbsd)
- i integrate emerge&C to a not linux platform (example apple macOSX, sgi-irix, hpux)

how to port the emerge/portage/ebuilds/etc to it ?

is there a guide to learn about it ?
[i see there is someone wants to port gentoo to sony PS2/mips, i think he is modifing the mips-portage, how to modify a portage ? how to adapt it ? how to build a fresh one ?]

[mark_alec]

http://www.gentoo.org/proj/en/gentoo-alt/contribute/?part=1&chap=5
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