linux-kernel - Re: something strange in libata-core.c for kernel 2.6.22-rc3

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

Message-ID: <20070521121537.48dd2b2c@the-village.bc.nu>
Date:	Mon, 21 May 2007 12:15:37 +0100
From:	Alan Cox <alan@...rguk.ukuu.org.uk>
To:	Tejun Heo <htejun@...il.com>
Cc:	Robert Hancock <hancockr@...w.ca>,
	linux-kernel <linux-kernel@...r.kernel.org>,
	ide <linux-ide@...r.kernel.org>, l.genoni@...relinux.com
Subject: Re: something strange in libata-core.c for kernel 2.6.22-rc3


> Yeah, that's consistent to what I've seen on my machine which is a
> variant of A8N.  No matter what value I through at _STM, _GTM just
> echoed the result thus always leading to 80c configuration.
> 
> > I guess this means that what we have to do is trust that the BIOS set up
> > a reasonable mode and base the cable detect on that (either by reading
> > back the boot-up controller registers, or by calling GTM). I imagine
> > this is what the Windows default IDE driver is doing (just using the
> > boot-up mode and feeding it back using GTM/STM on suspend/resume cycles).
> 
> Alan, what do you think?

Interesting, sounds like it is still useful rather than just reading the
registers as the GTM/STM seem to survive resume cycles which drive config
may not (eg if the driver is loaded after a s2ram/resume.

If it just echoes back we should also be able to detect this by using
knowingly invalid values.

Alan
-
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/