linux-kernel - Re: [PATCH] [PATCH v5] mtd:spi-nor: Add Altera Quad SPI Driver

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Date:	Thu, 20 Aug 2015 13:38:15 -0700
From:	Brian Norris <computersforpeace@...il.com>
To:	Marek Vasut <marex@...x.de>
Cc:	Viet Nga Dao <vndao@...era.com>,
	"linux-mtd@...ts.infradead.org" <linux-mtd@...ts.infradead.org>,
	David Woodhouse <dwmw2@...radead.org>,
	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	nga_chi86 <ngachi86@...il.com>
Subject: Re: [PATCH] [PATCH v5] mtd:spi-nor: Add Altera Quad SPI Driver

On Thu, Aug 20, 2015 at 11:42:18AM +0200, Marek Vasut wrote:
> On Thursday, August 20, 2015 at 11:18:14 AM, Viet Nga Dao wrote:
> > You might misunderstand the hardware problem i mention here. This soft
> > IP controller is able to provide the ID for our Altera EPCS/EPCQ flash
> > chips, which are non JEDEC chips. As from EPCQ device data sheet
> > (https://www.altera.com/content/dam/altera-www/global/en_US/pdfs/literature
> > /hb/cfg/cfg_cf52012.pdf), the device ID is 8 bit data.
> 
> So what exactly is the output of READID instruction followed by 6 Byte read
> on an EPCQ chip?

+1 to this question
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