booting an external disk via grub
John Austin
ja at jaa.org.uk
Sat Mar 1 09:55:55 UTC 2008
On Sat, 2008-03-01 at 09:25 +0000, John Austin wrote:
> On Fri, 2008-02-29 at 20:02 -0800, Markus Kesaromous wrote:
> > Since my bios does not support booting from a USB stick,
> > how can I modify my grub, so that it will boot from memory stick.
> > My main internal (laptop) drive has 1indows in partition 1
> > and Fedora 7 in partition 2. Grub lets me select either linux
> > or windows. But any external bootable device connected
> > to the laptop either via usb or sata (cardbus) is totally invisible
> > to bios and to grub.
> > So, my question to the list is: What should be added to grub
> > menus so that it can boot from external device?
> > Could someone show a grub entry example of booting
> > an external device that is invisible to BIOS?
> > What about the OS on the external disk that we are trying to boot?
> > Is there something that needs to be done to it so that the id
> > it assigns to itself is same as that assigned to it by grub?
> > (i.e such as hd0 or hd1, ...etc).
> >
> > Thanx for your help.
>
> Hi
>
> I haven't actually done this ... only something similar !!!!
>
> 1. Make sure your USB stick partitions are labelled uniquely, just makes
> life easier. (/etc/fstab on the stick must match) /root_stick say for
> root partition
>
> 2. Copy the kernel and initrd from you stick to your F7 /boot directory
> - obviously check the stick file names are unique. vmlinuz_stick,
> initrd_stick say.
>
> 3. The "F7" grub entry for the stick can then look something like
>
> root (hdx,y) The same as your F7 entry
> kernel /boot/vmlinuz_stick ro root=LABEL=/root_stick
> initrd /boot/initrd_stick
>
> Alternatives ...
> Using F8 I have managed to boot an external "BIOS invisible" USB stick
> 1 grub on a CD
> 2 syslinux on a second USB stick
>
Just tried the above - works OK !
John
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