Grub can boot FreeBSD without problems, if you want to use Grub then check: http://www.gnu.org/software/grub/man...b.html#FreeBSD
(The following is based on my experience with dual booting FreeBSD and Linux)
If you want to use boot0 as boot manager then install Grub on root partition on OpenSolaris. boot0 will find it during boot process and pass instructions to it.
Now, I'm not sure there are differences between OpenSolaris' Grub and "normal" GNU Grub boot manager, but if there are any I'm not aware of them as I've never installed OpenSolaris before.
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The best way to learn UNIX is to play with it, and the harder you play, the more you learn.
If you play hard enough, you'll break something for sure, and having to fix a badly broken system is arguably the fastest way of all to learn. -Michael Lucas, AbsoluteBSD
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