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Re: Issue with boot != root and chainloading

From: Pavel Roskin
Subject: Re: Issue with boot != root and chainloading
Date: Tue, 22 Jul 2008 19:58:49 -0400

On Tue, 2008-07-22 at 16:01 +0200, Felix Zielcke wrote:
> From: "Pavel Roskin" <address@hidden>
> > I've seen that fd1 somewhere, but I don't remember where.  I guess  
> > GRUB just defaults to that value if it cannot figure out the real  
> > device number of the root device.
> > 
> Maybe this Debian bug ? :)
> For the reporter fd0 wasn't in

That's it.  The "id" field doesn't represent the BIOS ID anymore.  It's
just a sequential number now, perhaps the entry number in,
not counting invalid devices.  But it's written to a field where the
bootloader expects to find a BIOS ID, such as 0x81 for the second hard

Although grub-setup correctly determines the name of the root device,
such as (hd1,1), there is no code that translates "hd1" into 0x81.  That
code was removed to allow drive names like "hd" without a number, used
on PowerPC machines.

That means that support is already totally broken on i386-pc.
So few people noticed it because cross-drive installs are uncommon, and
single-drive installs rely on the boot drive supplied by BIOS.

Pavel Roskin

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