[jggimi]

No, actually, the NetBSD dmesg won't help very much. At least, not here.

One thing you can try is a "verbose" boot - that produces lots of output, but you will see the last thing the kernel attempted to do (such as probe a specific device or device class).

1. At the boot> prompt, enter the User Kernel Config tool with the "-c" option.
2. At the first UKC> prompt, enter "verbose"
3. At the second UKC> prompt, enter "quit"

Watch for the kernel output to stop... or to loop, and note the last thing it was doing ... or continues to do forever.

See the boot_config(8) and boot(8) man pages.