linux-kernel - Re: [PATCH 3/3] MTD: spi-nor: add flag to not use sector erase.

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Date:	Mon, 4 May 2015 14:12:46 +0200
From:	Marek Vasut <marex@...x.de>
To:	Michal Suchanek <hramrach@...il.com>
Cc:	David Woodhouse <dwmw2@...radead.org>,
	Brian Norris <computersforpeace@...il.com>,
	"Rafa?? Mi??ecki" <zajec5@...il.com>,
	Alison Chaiken <alison_chaiken@...tor.com>,
	Ben Hutchings <ben@...adent.org.uk>,
	Geert Uytterhoeven <geert+renesas@...der.be>,
	"Bean Huo (beanhuo)" <beanhuo@...ron.com>,
	"grmoore@...era.com" <grmoore@...era.com>,
	linux-mtd@...ts.infradead.org,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 3/3] MTD: spi-nor: add flag to not use sector erase.

On Monday, May 04, 2015 at 01:11:03 PM, Michal Suchanek wrote:
> Hello,

Hi!

> On 1 May 2015 at 16:20, Marek Vasut <marex@...x.de> wrote:
> > On Friday, May 01, 2015 at 09:05:15 AM, Michal Suchanek wrote:
> >> On 1 May 2015 at 01:13, Marek Vasut <marex@...x.de> wrote:
> >> I can determine it for this particular chip. However, when the vendor
> >> datasheet says the block is 64/32K it might mean that chips with this
> >> ID can have either block size.
> > 
> > http://www.chingistek.com/img/Product_Files/Pm25LD010020datasheet%20v04.p
> > df page 21:
> > 
> > SECTOR_ER (20h) erases 4kByte sector.
> > BLOCK_ER (d8h) erases 64kByte sector.
> > 
> > http://www.gigadevice.com/product/download/366.html?locale=en_US
> > page 27-28:
> > 
> > Sector Erase (SE) (20h) erases 4kByte sector
> > 64KB Block Erase (BE) (d8h) erases 64kByte sector
> 
> It's pretty much the same as the datasheet I used
> http://www.elm-tech.com/en/products/spi-flash-memory/gd25q41/gd25q41.pdf
> 
> It mentions both
> 32KB Block Erase (BE) (52H)
> and
> 64KB Block Erase (BE) (D8H)

The SPI NOR framework will use 0xbe opcode, no problem.

> So the chip probably tries its best to be compatible with any command
> set and this last patch is not needed. The memory organization table
> on page 7 is not all that reassuring, though.

Which exact part do you refer to please ?

Best regards,
Marek Vasut
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