lkml.org 
[lkml]   [2004]   [Sep]   [2]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
From
SubjectRe: [linux-usb-devel] RE: [PATCH] Early USB handoff
Date
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
-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/

\
 
 \ /
  Last update: 2005-03-22 14:05    [W:0.068 / U:0.200 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site