See the topic question above.
There are no roadmaps in Haiku, because most of the developers are unpaid and work on whatever they want with whatever time they have between their paid jobs and other activities.
There is currently no work on PowerPC, and the 64-bit POWER or s390x port were not even considered by anyone.
For ARM, the port is somewhat more advanced, but still not enough to boot to the desktop. It’s an interesting place to look at if you want to do some low level kernel hacking.
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I have a Power9 desktop, and would love to have Haiku on it someday.
If only that wasn’t so expensive to buy :’(
Indeed… it was a difficult decision to buy, and my only regret was not doing so earlier.