On 2012-11-15 17:31, Ronald F. Guilmette wrote:
(This stuff would probably be a lot less confiusing if I actually
knew
what I was doing, but...)
OK, Warren, I've just done the following steps. The first two I drew
from the manpage examples, and then followed those up with two
commands
from your tutorial.
/sbin/gpart create -s GPT ada0 # manpage example is wrong, ad0
-> ada0
/sbin/gpart bootcode -b /boot/mbr ad0 # manpage wrong again, pmbr
-> mbr
gpart add -t freebsd-boot -l gpboot -b 40 -s 512K ada0
gpart bootcode -b /boot/pmbr -p /boot/gptboot -i 1 ada0
That last one, done at the suggestion of your tutorial page, has me
completely perplexed, because of what is said, very explicitly, in
the
gpart(8) manpage:
bootcode Embed bootstrap code into the partitioning scheme's
metadata on
the geom (using -b bootcode) or write bootstrap code
into a
partition (using -p partcode and -i index).
Please note the use of the word "or".
The man page is telling me to _either_ use the -p option _or else_
use
the -p and -i options together. But you are telling me to use all
three
in one go!
Forgive me, but I'm confused. (As you can tell by now, I am often
easily
confused. Sorry.)
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I saw this, and well started wondering myself, as I have been using
this while doing work on booting FreeBSD via ZFS (of course using -p
/boot/gptzfsboot), I got the line from a tutorial on booting from ZFS.
Never thought much of it, until now, but I believe I see now why, the
secret is the pmbr, notice the "p". Its the protective mbr, it lets
formatting tools that understand mbr, but not gpart know that there is
something there, the actual boot code is in the partition.
--
Thanks,
Dean E. Weimer
http://www.dweimer.net/
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