From: David Brownell <david-b@pacbell.net>
To: linux-usb-devel@lists.sourceforge.net
Cc: "Aleksey Gorelov" <Aleksey_Gorelov@Phoenix.com>,
"Alan Cox" <alan@lxorguk.ukuu.org.uk>,
"Pete Zaitcev" <zaitcev@redhat.com>,
"Linux Kernel Mailing List" <linux-kernel@vger.kernel.org>
Subject: Re: [linux-usb-devel] RE: [PATCH] Early USB handoff
Date: Thu, 2 Sep 2004 16:44:51 -0700 [thread overview]
Message-ID: <200409021644.51961.david-b@pacbell.net> (raw)
In-Reply-To: <5F106036E3D97448B673ED7AA8B2B6B3016ADED2@scl-exch2k.phoenix.com>
On Thursday 02 September 2004 1:26 pm, Aleksey Gorelov wrote:
> While still in real mode, BIOS takes care of interrupts from
> devices. But once OS takes control over and goes to protected
> mode, there is no easy way for BIOS to detect that and disable HC.
I find myself a bit unsettled at the notion of not really being
able to blame this behavior on BIOS bugs. What's the world
coming to any more?!
> So, one should either avoid 'sharing' it with other devices (at
> IRQ routing stage), or reprogram HC in native OS mode first (at
> least disable interrupts).
That sounds like it could explain lots of the init/irq problems we've
had on various systems. Makes me a lot more interested in seeing
this fix go in ... :)
For backwards compatibility, the early reset should not be the
default. There aren't many systems where it's a problem.
- Dave
prev parent reply other threads:[~2004-09-03 0:59 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2004-09-02 20:26 [PATCH] Early USB handoff Aleksey Gorelov
2004-09-02 23:44 ` David Brownell [this message]
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