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Re: howto map boot device to hd0 automagically?

From: Harald Dunkel
Subject: Re: howto map boot device to hd0 automagically?
Date: Sun, 17 Feb 2008 16:35:28 +0100
User-agent: Thunderbird (X11/20071115)

Hi Franklin,

Franklin PIAT wrote:

I have no experience setting-up grub on USB device, but under PC BIOS,
the "hard-disk" your're booting from is always numbered 0x80 (AFAIK,
BIOS's 0x80  _is_ Grub hd0).

Therefore, when you boot from IDE disk, you have:
  IDE HD    : 0x80 == hd0 => hda|sda
  USB drive : 0x81 == hd1 => sdb

But when you tell your BIOS to boot from USB disk, it's reordering BIOS
ID, so:
  USB drive : 0x80 == hd0 => sdb*
  IDE HD    : 0x81 == hd1 => hda|sda*

So boot disk should always be "(hd0)".

I see, but if I configure the usb stick with (hd0,0), then I
just get a "grub>" prompt. I don't see the usual list of titles
to select from. Running

        find /boot/grub/stage1

in this session I get


i.e. (hd0,0) is not found at all :-(.

Just to be sure: the bios lists the usb stick as a hard drive.




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