linux-kernel - Re: [PATCH 1/2]: serial8250: Use native_io

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [day] [month] [year] [list]

Message-ID: <4BA122EA.9030305@zytor.com>
Date:	Wed, 17 Mar 2010 11:43:54 -0700
From:	"H. Peter Anvin" <hpa@...or.com>
To:	Alan Cox <alan@...rguk.ukuu.org.uk>
CC:	Simon Kagstrom <simon.kagstrom@...insight.net>, x86@...nel.org,
	linux-serial@...r.kernel.org, linux-kernel@...r.kernel.org,
	mingo@...hat.com, tglx@...utronix.de, alan@...ux.intel.com,
	akpm@...ux-foundation.org
Subject: Re: [PATCH 1/2]: serial8250: Use native_io_delay on the x86

On 03/17/2010 11:36 AM, Alan Cox wrote:
>
> You just need a write to something on the ISA bus which is 'safe' so that
> you don't end up reading back what you wrote to an non-existant port as
> some old chipsets will return the last ISA result when you do this rather
> than 0xff.

Ah... floating bus syndrome.  So how about writing 0xff to the SCR 
register in the same register range?

	-hpa
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/