When using the not-documented-but-ought-to 'boot sd(...)file' syntax (e.g.

When using the not-documented-but-ought-to 'boot sd(...)file' syntax (e.g.
when mopbooting the bootblocks because one trashed the ones on disk by
accident), be sure to use the proper BDEV_SDx rpb device type value,
depending on the type of onboard controller. Crank version.