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Date: Thu, 20 Aug 2015 13:38:15 -0700
From: Brian Norris <computersforpeace@gmail.com>
To: Marek Vasut <marex@denx.de>
Cc: Viet Nga Dao <vndao@altera.com>,
 "linux-mtd@lists.infradead.org" <linux-mtd@lists.infradead.org>,
 David Woodhouse <dwmw2@infradead.org>,
 "devicetree@vger.kernel.org" <devicetree@vger.kernel.org>,
 "linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
 nga_chi86 <ngachi86@gmail.com>
Subject: Re: [PATCH] [PATCH v5] mtd:spi-nor: Add Altera Quad SPI Driver
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References: <1440053705-3836-1-git-send-email-vndao@altera.com>
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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