linux-kernel - Re: [EDAC-AMD64] Display correct RAM sizes in ganged mode on F10 CPUs

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Date:	Thu, 3 Feb 2011 17:42:03 +0100
From:	Markus Trippelsdorf <markus@...ppelsdorf.de>
To:	Borislav Petkov <bp@...64.org>
Cc:	"linux-edac@...r.kernel.org" <linux-edac@...r.kernel.org>,
	Doug Thompson <dougthompson@...ssion.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [EDAC-AMD64] Display correct RAM sizes in ganged mode on F10 CPUs

On 2011.02.03 at 17:36 +0100, Borislav Petkov wrote:
> On Thu, Feb 03, 2011 at 10:59:52AM -0500, Markus Trippelsdorf wrote:
> > Hm, that doesn't work:
> > 
> > EDAC amd64: F10h detected (node 0).
> > EDAC MC: DCT0 chip selects:
> > EDAC amd64: MC: 0:  1024MB 1:  1024MB
> > EDAC amd64: MC: 2:  1024MB 3:  1024MB
> > EDAC amd64: MC: 4:     0MB 5:     0MB
> > EDAC amd64: MC: 6:     0MB 7:     0MB
> > EDAC MC: DCT1 chip selects:
> > EDAC amd64: MC: 0:     0MB 1:     0MB
> > EDAC amd64: MC: 2:     0MB 3:     0MB
> > EDAC amd64: MC: 4:     0MB 5:     0MB
> > EDAC amd64: MC: 6:     0MB 7:     0MB
> > EDAC amd64: using x4 syndromes.
> 
> Of course it doesn't, doh!, we need the DRAM chip selects from the
> second DCT too. Can you please run this little script as root so that I
> can verify that BIOS is actually programming sensible values in those in
> ganged mode? (Yeah, leave your DCT setting to ganged in BIOS).
> 
> --
> #!/bin/bash
> 
> i=0x140
> 
> while (( $i <= 0x15c )); do
>         reg=$(printf "0x%x" $i)
>         setpci -s 18.2 $reg.l
>         i=$(($i+4))
> done

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-- 
Markus
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