linux-kernel - Re: [PATCH 1/2] edac: add support for Calxeda highbank memory controller

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Message-ID: <4FCFE028.10005@gmail.com>
Date:	Wed, 06 Jun 2012 17:56:40 -0500
From:	Rob Herring <robherring2@...il.com>
To:	Mauro Carvalho Chehab <mchehab@...hat.com>
CC:	linux-edac@...r.kernel.org, linux-kernel@...r.kernel.org,
	devicetree-discuss@...ts.ozlabs.org
Subject: Re: [PATCH 1/2] edac: add support for Calxeda highbank memory controller

Mauro,

On 06/06/2012 05:34 PM, Mauro Carvalho Chehab wrote:
> Hi Rob,
> 
> Em 06-06-2012 19:02, Rob Herring escreveu:
>> From: Rob Herring <rob.herring@...xeda.com>
>>
>> Add support for memory controller on Calxeda Highbank platforms. Highbank
>> platforms support a single 4GB mini-DIMM with 1-bit correction and 2-bit
>> detection.
>>

[snip]

>> +
>> +	layers[0].type = EDAC_MC_LAYER_CHIP_SELECT;
>> +	layers[0].size = 1;
>> +	layers[0].is_virt_csrow = true;
>> +	layers[1].type = EDAC_MC_LAYER_CHANNEL;
>> +	layers[1].size = 1;
>> +	layers[1].is_virt_csrow = false;
>> +	mci = edac_mc_alloc(0, ARRAY_SIZE(layers), layers,
>> +			    sizeof(struct hb_mc_drvdata));
> 
> Hmm... I suspect that memories by DIMM chip select/channel at Calxeda,
> as it is using just 1 cs/channel. It probably makes more sense to add new layer
> type(s) to properly represent the way your memory controller addresses it, if
> Calxeda doesn't work with DIMMs.

Not sure I follow. DIMMs are supported, but only a newer JEDEC form
factor (DDR3 72-bit mini DIMM). The h/w pretty much fixed to a single
4GB DIMM. The controller is 1 72-bit channel.

Rob
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