linux-kernel - Re: [PATCH] mtd: spi-nor: Add support for sst25wf020a.

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Date:	Sat, 15 Aug 2015 10:38:59 +0200
From:	Alexis Ballier <aballier@...too.org>
To:	Marek Vasut <marex@...x.de>
Cc:	Ben Hutchings <ben@...adent.org.uk>,
	Rafał Miłecki <zajec5@...il.com>,
	open list <linux-kernel@...r.kernel.org>,
	Gabor Juhos <juhosg@...nwrt.org>,
	"open list:MEMORY TECHNOLOGY DEVICES \(MTD\)" 
	<linux-mtd@...ts.infradead.org>,
	Huang Shijie <shijie.huang@...el.com>,
	Brian Norris <computersforpeace@...il.com>,
	David Woodhouse <dwmw2@...radead.org>,
	"Bean Huo 霍斌斌 \(beanhuo\)" <beanhuo@...ron.com>
Subject: Re: [PATCH] mtd: spi-nor: Add support for sst25wf020a.

On Fri, 14 Aug 2015 22:45:14 +0200
Marek Vasut <marex@...x.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@...too.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).

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).

Alexis.


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