linux-kernel - Re: [PATCH RFC] USB: Add HCD fastboot

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Date:	Wed, 6 Aug 2008 20:29:56 -0700
From:	David Brownell <david-b@...bell.net>
To:	Alan Stern <stern@...land.harvard.edu>,
	Simon Arlott <simon@...e.lp0.eu>
Cc:	Rene Herman <rene.herman@...access.nl>,
	Arjan van de Ven <arjan@...radead.org>,
	linux-kernel@...r.kernel.org, mingo@...e.hu,
	Daniel Walker <dwalker@...sta.com>,
	USB list <linux-usb@...r.kernel.org>,
	Greg Kroah-Hartman <gregkh@...e.de>
Subject: Re: [PATCH RFC] USB: Add HCD fastboot

> > Lack of a keyboard makes it impossible to do anything if the module fails to 
> > load... as I understand it when the HCD init runs, any BIOS emulation stops?
> 
> That's right.  The host driver kicks the BIOS off the hardware.

That's done much earlier ... as part of PCI quirk handling.
See drivers/usb/host/pci-quirks.c ... it's not been part of
the HCDs for about three years now.  I don't recall the details
right now, but letting the BIOS hang on to that hardware was
causing a lot of wierd problems that went away when we made
that change.

If a module fails to load, fix the bug in that module.  :)

- Dave

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