2002-11-11 07:09:07

by Filipau, Ihar

[permalink] [raw]
Subject: FW: [linux-usb-devel] boot from usb storage


Can any-one comment on this here?

In short:
Is it possible to boot from portable USB DVD drive?
Is this supported in BIOSes?
Will kernel be able to find a root?

P.S. I'm not subscribed - please CC.

> On Thu, 2002-11-07 at 02:24, Filipau, Ihar wrote:
> > Hello All!
> >
> > Short question - hope for short answer.
> > Google gives too much garbage and IOMega web site has
> some info, but
> > only for Macs.
> >
> >
> > Is it possible to boot from USB storage?
>
> This is dependent on your BIOS, not on your OS. IIRC, Linux
> had some support for a USB storage root fs, but i don't know
> what the current state is.
>
> > I'm in interested in booting from DVD-ROM and I want
> drive to be
> > portable.
> > Is it possible?
> >


2002-11-11 13:03:50

by Eric Lammerts

[permalink] [raw]
Subject: Re: FW: [linux-usb-devel] boot from usb storage


On Mon, 11 Nov 2002, Filipau, Ihar wrote:
> In short:
> Is it possible to boot from portable USB DVD drive?
> Is this supported in BIOSes?

Don't know.

> Will kernel be able to find a root?

Normally it doesn't work because USB devices are detectly
asynchronously (from a kernel thread). At the time a USB device is
discovered, the root mounting code has already given up.

I have a patch to fix this at
http://www.lammerts.org/software/kernelpatches/usb-storage-root.patch
It's tested only with USB harddisks, but will probably also work with
DVD drives.

Eric