From: Marek Vasut <marex@denx.de>
To: Alexis Ballier <aballier@gentoo.org>
Subject: Re: [PATCH] mtd: spi-nor: Add support for sst25wf020a.
Date: Sat, 15 Aug 2015 15:29:35 +0200
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Cc: Ben Hutchings <ben@decadent.org.uk>,
        =?utf-8?q?Rafa=C5=82_Mi=C5=82ecki?= <zajec5@gmail.com>,
        open list <linux-kernel@vger.kernel.org>,
        Gabor Juhos <juhosg@openwrt.org>,
        "open list:MEMORY TECHNOLOGY DEVICES \(MTD\)" 
	<linux-mtd@lists.infradead.org>,
        Huang Shijie <shijie.huang@intel.com>,
        Brian Norris <computersforpeace@gmail.com>,
        David Woodhouse <dwmw2@infradead.org>,
        "Bean Huo =?utf-8?q?=E9=9C=8D=E6=96=8C=E6=96=8C?= \(beanhuo\)" 
	<beanhuo@micron.com>
References: <1439573741-24491-1-git-send-email-aballier@gentoo.org> <201508142245.14289.marex@denx.de> <20150815103859.0a15da43@gentoo.org>
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On Saturday, August 15, 2015 at 10:38:59 AM, Alexis Ballier wrote:
> On Fri, 14 Aug 2015 22:45:14 +0200
> 
> Marek Vasut <marex@denx.de> wrote:
> > On Friday, August 14, 2015 at 07:35:39 PM, Alexis Ballier wrote:
> > > It is a 256KiB flash with 4 KiB erase sectors
> > > and 64KiB overlay blocks.
> > > 
> > > This is the one available on Hardkernel's Odroid U3 shield.
> > > 
> > > Signed-off-by: Alexis Ballier <aballier@gentoo.org>
> > > ---
> > > 
> > >  drivers/mtd/spi-nor/spi-nor.c | 1 +
> > >  1 file changed, 1 insertion(+)
> > > 
> > > diff --git a/drivers/mtd/spi-nor/spi-nor.c
> > > b/drivers/mtd/spi-nor/spi-nor.c index d78831b..e521b35 100644
> > > --- a/drivers/mtd/spi-nor/spi-nor.c
> > > +++ b/drivers/mtd/spi-nor/spi-nor.c
> > > @@ -636,6 +636,7 @@ static const struct spi_device_id spi_nor_ids[]
> > > = { { "sst25wf512",  INFO(0xbf2501, 0, 64 * 1024,  1, SECT_4K |
> > > SST_WRITE)
> > 
> > },
> > 
> > >  	{ "sst25wf010",  INFO(0xbf2502, 0, 64 * 1024,  2, SECT_4K
> > >  	
> > > | SST_WRITE)
> > 
> > },
> > 
> > >  	{ "sst25wf020",  INFO(0xbf2503, 0, 64 * 1024,  4, SECT_4K
> > >  	
> > > | SST_WRITE)
> > 
> > },
> > 
> > > +	{ "sst25wf020a", INFO(0x621612, 0, 64 * 1024,  4,
> > > SECT_4K) },
> > 
> > Is the SST_WRITE not needed on this device ?
> 
> Tried that at first and it didn't work (writes were silently not
> performed).

This is the worst possible behavior.

> I'm no expert here, but I don't see anything about auto address
> increment in the spec:
> http://ww1.microchip.com/downloads/en/DeviceDoc/20005139E.pdf
> and it uses the page program command (0x02).

They probably decided to start rolling out a standard SPI NOR, which is good :)

Best regards,
Marek Vasut
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