+ Ultrix compat disklabel support.
        I don't have any Ultrix disks any more (except maybe for an
        old RZ58 or two with stiction).  Just from code inspection, it
        looks like the pmax readdisklabel() is still called in the right
        places...

readdisklabel() is properly called from the 'sd' driver, else sun disklabel
support would not work there.


    + miniroot installation support.
        Does anyone use miniroot's for installing anymore?  One (untested)
        idea is to deliberately botch the disklabel checksum so that disk
        drivers don't see a valid label and partition table.

i don't get what the issue here is?