branches: 1.24.6; 1.24.18;
Add a new hook, md_pre_mount(), that is called after preparation of
the target filesystem, but before mounting it. Use this on sparc64
to install the primary boot block, but install the secondary boot
(/ofwboot) later.
This allows sysinst to run at securelevel 1 (as long as we don't do an
upgrade install on the hard disk we booted from).