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.
I rewrote that section of the FAQ years ago (around FreeBSD 3.1!!) because the previous wording was unclear and I did _exactly_ what Rakhesh has done :-(
At that time it was not possible to add FreeBSD to the NTLDR menu if FreeBSD was on a _different disk_ so you had to either use the FreeBSD boot menu or put the FreeBSD root partition on the same disk as NT (which usually required a BIOS that could boot beyond the first 1024 cylinders) or use the FreeBSD boot manager (which used /boot/boot0).
This is what I have done ever since. As I only have a single user set up in XP it doesn't show the NTLDR menu so you don't have to go through two boot menus, just the FreeBSD F1/F5 choice.
Caveat: Things have no doubt changed since then so it may now be possible to add FreeBSD to the NTLDR menu with FreeBSD on a different disk, but I've never investigated it as I am happy with the solution I use.
HTH
Regards,
Mark
On Mon, 31 Jan 2005 08:44:23 +0000, Mark Ovens <[EMAIL PROTECTED]> 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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