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existing partition and the boot blocks span, and update all callers to require
an overlap limit of zero sectors (thus not changing their behaviour).
Then, add proper support for vax: copy the 2nd-stage boot block to /boot and
install the 1st-stage boot block at the beginning of the disk, retaining the
disklabel; allow for an overlap of up to 16 sectors, which is perfectly fine
as long as your `a' partition is FFS.
Note that regular installs will not even have such an overlap, because the
default OpenBSD span on a disk on vax starts at sector 16, but installation
media use sperific layout which require this.
ok krw@
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