Date: Sun, 9 Dec 2007 13:41:58 +0000
From: "Dr. David Alan Gilbert" <linux@treblig.org>
To: Pavel Machek <pavel@ucw.cz>
Cc: Alan Cox <alan@lxorguk.ukuu.org.uk>, Andi Kleen <andi@firstfloor.org>,
       "David P. Reed" <dpreed@reed.com>, linux-kernel@vger.kernel.org,
       Thomas Gleixner <tglx@linutronix.de>, Ingo Molnar <mingo@redhat.com>,
       "H. Peter Anvin" <hpa@zytor.com>
Subject: Re: RFC: outb 0x80 in inb_p, outb_p harmful on some modern AMD64 with MCP51 laptops
Message-ID: <20071209134158.GA21475@gallifrey>
References: <475879CD.9080006@reed.com> <p733auekcly.fsf@bingen.suse.de> <20071207160439.71b7f46a@the-village.bc.nu> <20071209125458.GB4381@ucw.cz>
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* Pavel Machek (pavel@ucw.cz) wrote:
> Hi!

> Actually, I've seen few pci cards with leds on port 0x80, and I
> wonder: is our outb_p really correct?
> 
> I mean, we expect 8usec delay -- historical ISA timing -- but when
> _PCI_ card with leds is inserted, it is likely to be faster than old
> ISA, right?

In the opposite direction I'm sure I've heard of things that port 80
information down i2c - could this be slower?

Dave
-- 
 -----Open up your eyes, open up your mind, open up your code -------   
/ Dr. David Alan Gilbert    | Running GNU/Linux on Alpha,68K| Happy  \ 
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