Re: USB device not seen by grub

[Robert Millan <rmh@aybabtu.com>]

On Thu, Dec 03, 2009 at 06:27:07PM -0600, richardvoigt@gmail.com wrote:
> 2009/12/3 Vladimir 'φ-coder/phcoder' Serbinenko <phcoder@gmail.com>:
> > Chris Jones wrote:
> >> I am trying to have grub boot off a partition on a USB stick.
> >>
> >>
> > You can't chainload to disk invisible by BIOS. But you can load
> > supported OSes from it.
> 
> What would be necessary to enable chainload to such devices?  Install
> an IRQ 19 handler?

Yeah, something like that.  In essence, GRUB acting as a BIOS.  Sounds awful,
but hey we already have "efiemu".

> Invoke the extension ROM of the host adapter so
> that it hooks IRQ 19?

There's usually no such ROM.  Except for adapters that come in discrete
PCI cards.  And even then, I doubt it's always present.

-- 
Robert Millan

  The DRM opt-in fallacy: "Your data belongs to us. We will decide when (and
  how) you may access your data; but nobody's threatening your freedom: we
  still allow you to remove your data and not access it at all."