ppc@ just sharing information about this post https://marc.info/?l=openbsd-ppc&m=155231977928919&q=mbox
succeeded in installing 6.6-release on an iBook G4 (PowerBook6,7) via a USB stick. a micro SD -> USB adapter did not work! a true USB stick (Sandisk Cruzer) in my case worked properly if the OF device tree does not show a /disk@N i suggest using another USB stick yorosiku ~
