* Re: [gentoo-dev] question about grub
2002-03-15 18:00 [gentoo-dev] question about grub Ryan McLean
@ 2002-03-15 18:03 ` Matthew T. Jachimstal
2002-03-15 18:35 ` Dan Armak
1 sibling, 0 replies; 3+ messages in thread
From: Matthew T. Jachimstal @ 2002-03-15 18:03 UTC (permalink / raw
To: gentoo-dev
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On Fri, 2002-03-15 at 13:00, Ryan McLean wrote:
> Hello,
>
> I was reading your excellent installation documentation online, and I
> ran into a question. Near the end you're breaking down the commands for
> grub, but you leave some information out that I would like to know:
>
> # Below needed only for people who dual-boot
> title=Windows NT Workstation
> root (hd0,5)
> chainloader +1
>
> I'm unclear as to what the (hd0,5) are pointing to, is to say "boot of
> off the FAT partition located at partition 5"? Normally MS likes to
> reside on the primary partition of the drive, so I just want clarification
> on this. For instance, if I have a dual boot, MS on the primary partition
> and Gentoo's root at (sd0,3), then I would put root (sd0,1) under my
> Windows boot section, correct? And also, what does the chainloader +1
> command do? Thank you fo your time, I'm an old fan of lilo, but I have
> been cosidering migrating to a newer bootloader :)
I'll take a quick stab at this:
First, always add 1 to grub's numbers for disk and partition. The first
partition of the first disk is (hd0,0). So, if your Windows is on sda1,
the grub parameter is (sd0,0).
The chainloader +1 (I think) means to start chain loading the boot
loader 1 sector from the start of the specified (root) partition.
There's some excellent grub docs at the GNU website:
http://www.gnu.org/manual/grub-0.90/grub.html
I'd definitely encourage you to move to grub. Writing the boot sector
once really is much nicer. I messed up a config file, putting hd(0,0)
instead of (hd0,0). With LILO I would've needed to find a boot disc. In
grub, I simply edited the boot commands from the menu and merrily went
on with the boot.
Have fun!
Matthew
--
Matthew T. Jachimstal | Phone: (419) 861-3331 .~.
System Administrator | FAX: (419) 861-3340 /V\
Unique Systems, Inc. | http://www.uniqsys.com // \\
6920 Spring Valley Drive, Suite 106 | matthew@uniqsys.com /( )\
Holland, OH 43528 | ^`~'^
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^ permalink raw reply [flat|nested] 3+ messages in thread
* Re: [gentoo-dev] question about grub
2002-03-15 18:00 [gentoo-dev] question about grub Ryan McLean
2002-03-15 18:03 ` Matthew T. Jachimstal
@ 2002-03-15 18:35 ` Dan Armak
1 sibling, 0 replies; 3+ messages in thread
From: Dan Armak @ 2002-03-15 18:35 UTC (permalink / raw
To: gentoo-dev
On Friday 15 March 2002 20:00, Ryan McLean wrote:
> Hello,
>
> I was reading your excellent installation documentation online, and I
> ran into a question. Near the end you're breaking down the commands for
> grub, but you leave some information out that I would like to know:
>
> # Below needed only for people who dual-boot
> title=Windows NT Workstation
> root (hd0,5)
> chainloader +1
>
> I'm unclear as to what the (hd0,5) are pointing to, is to say "boot of
> off the FAT partition located at partition 5"? Normally MS likes to
> reside on the primary partition of the drive, so I just want clarification
> on this. For instance, if I have a dual boot, MS on the primary partition
> and Gentoo's root at (sd0,3), then I would put root (sd0,1) under my
> Windows boot section, correct? And also, what does the chainloader +1
> command do? Thank you fo your time, I'm an old fan of lilo, but I have
> been cosidering migrating to a newer bootloader :)
One thing you must be careful with is the partition numbers. In grub, unlike
the /dev/hdxy devices, the first partition is numbered 0 not 1. So (hd0,5) is
first harddisk, sixth partition.
chainloader +1 boots a partition that has custom boot code in its boot sector.
In our case, the windows boot code. Without it grub would mount the partition
and load a linux-style kernel (with a kernel= line).
--
Dan Armak
Gentoo Linux Developer, Desktop Team (KDE)
Matan, Israel
^ permalink raw reply [flat|nested] 3+ messages in thread