K 10
svn:author
V 2
ae
K 8
svn:date
V 27
2012-06-20T08:29:24.848541Z
K 7
svn:log
V 612
In case when we have damaged several first sectors, GEOM_PART_GPT class
will not detect GPT even if backup GPT header is ok. To recover we should
write PMBR to the LBA 0. But we can't use `gpart bootcode` command until
GPT is detected and geom created. We can dd(8) /boot/pmbr image and
kernel will be able detect GPT. But our PMBR image contains only empty
partition entries and our loader can't detect GPT when it hasn't the
partition record with type PMBR.

Add one partition record to the PMBR image. It covers all space after
the LBA 0. It is better to have one partially correct record, than
have nothing.

END