autoconf —
diagnostics from the autoconfiguration code
When NetBSD bootstraps it probes the innards of the
  machine on which it is running and locates controllers, drives, and other
  devices, printing out what it finds on the console. This procedure is driven
  by a system configuration table which is processed by
  config(1) and compiled into
  each kernel. Devices which exist in the machine but are not configured into
  the kernel are not detected.
  - CPU type (0x%x) not supported.
- You tried to boot NetBSD on a type of CPU type
      which it doesn't (or at least this compiled version of
      NetBSD doesn't) understand.