BeagleBone can't find boot/root device w/netbsd-9?

["John D. Baker" <jdbaker%consolidated.net@localhost>]

I finally got around to booting NetBSD/evbarm-earmv7hf-9.0_BETA on my
BeagleBone Green (like BeagleBone Black but w/o video hardware).

The kernel cannot figure out the boot/root device, even if "bootargs"
is set in U-boot before booting.  It therefore prompts for root/swap/init.

This worked fine in netbsd-8.

I haven't really kept up with changes to NetBSD/arm support, so if this
has been discussed before, please point me to the appropriate thread.

Thanks.

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