linux-kernel - Re: [PATCH] watchdog, SP5100: Check if firmware has set correct value in tcobase.

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Message-ID: <20110317000035.GA3613@dumpdata.com>
Date:	Wed, 16 Mar 2011 20:00:35 -0400
From:	Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>
To:	Yinghai Lu <yinghai@...nel.org>
Cc:	Mike Waychison <mikew@...gle.com>,
	Wim Van Sebroeck <wim@...ana.be>,
	Stefano Stabellini <stefano.stabellini@...citrix.com>,
	"H. Peter Anvin" <hpa@...or.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Jeremy Fitzhardinge <jeremy@...p.org>,
	"xen-devel@...ts.xensource.com" <xen-devel@...ts.xensource.com>,
	linux-watchdog@...r.kernel.org,
	Priyanka Gupta <priyankag@...gle.com>
Subject: Re: [PATCH] watchdog, SP5100: Check if firmware has set correct
 value in tcobase.

On Wed, Mar 16, 2011 at 02:18:17PM -0700, Yinghai Lu wrote:
> 
> 
> Stefano found SP5100 TCO watchdog driver using wrong address.
> 
> [    9.148536] SP5100 TCO timer: SP5100 TCO WatchDog Timer Driver v0.01
> [    9.148628] DEBUG __ioremap_caller WARNING address=b8fe00 size=8 valid=1 reserved=1
> 
> and e820 said that range is RAM.
> 
> We should check if we can use that reading out. BIOS could just program wrong address there.
> 
> -v2: Mike pointed out one path need one release.
> 
> Reported-by: Stefano Stabellini <stefano.stabellini@...citrix.com>
> Signed-off-by:Yinghai Lu <yinghai@...nel.org>
> Acked-by: Mike Waychison <mikew@...gle.com>

Tested-by: Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>

Stefano,

this fixes my bootup issues with your:
xen: set max_pfn_mapped to the last pfn mapped
patch. Will try the full patchset tomorrow.
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