Booting FreeBSD-5.3 from NTLDR
Loren M. Lang
lorenl at alzatex.com
Mon Jan 31 02:35:38 PST 2005
On Mon, Jan 31, 2005 at 02:16:25PM +0400, Rakhesh Sasidharan wrote:
> Thanks for that link! I had read that part of the handbook a long time
> ago, and that's how my ideas of boot0 and boot1 and etc etc had gotten
> clear. Glad to see it once again -- in the context of my question! :))
>
> So what I understand now is -- copying boot0 over to c:\bootsect.bsd
> will *not* work. Which explains why my MBR got messed up when I tried
> booting FreeBSD this way. :(
>
> But I'm still confused. How do I install boot0 using sysinstall? As
> far as I remm, sysinstall gives three options -- (a) leave the MBR
> untouched, (b) put a standard MBR, and (c) install BootEasy. My
> understanding is that option (b) copies boot0 to the MBR, and this
> that is what I had chosen while installing FreeBSD. How does one copy
> boot0 to a file using sysinstall??
I think option b is actually /boot/mbr and BootEasy refers to
/boot/boot0. They are two different boot loaders, mbr being a very
simple one with no configuration. I think fdisk -B is used to install
/boot/mbr to the mbr of a harddisk and boot0cfg is used to install
BootEasy.
>
>
> On Mon, 31 Jan 2005 08:44:23 +0000, Mark Ovens <marko at freebsd.org> wrote:
> > Rakhesh Sasidharan wrote:
> > >> No, boot0 is just a normal file that is 512 bytes long. There is
> > >> nothing special about it. In it is a bootloader program that can be
> > >> used to boot FreeBSD, and if you run it during boot, it will read the
> > >> partition table and look for all OSes. I think it will modify the
> > >> partition table, though, marking the last OS you booted into, but that's
> > >> the program running doing that, the file itself is harmless.
> > >
> > > Ok. I must have used some other command then, which resulted in my
> > > first disk MBR getting over-written ... strange. :-/
> > >
> > > By the way, does the fact that NTLDR is on my first disk, while
> > > FreeBSD (and hence its MBR boot0) is on my second disk complicate
> > > matters? I mean, you mention boot0 will modify my partition table to
> > > reflect which OS was booted last -- will it by any chance modify the
> > > partition table on the first disk and hence mess it?
> > >
> > >
> >
> > Yes and yes,
> > http://www.freebsd.org/doc/en_US.ISO8859-1/books/faq/disks.html#NT-BOOTLOADER
> >
> > Regards,
> >
> > Mark
> >
> > ---
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> >
> >
>
>
> --
> -- Rakhesh
> rax at rakhesh.com
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