linux-kernel - Re: [PATCH] mtd: spi-nor: enable 4B opcodes for n25q256a

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Date:   Fri, 3 May 2019 12:37:05 +0200
From:   Simon Goldschmidt <simon.k.r.goldschmidt@...il.com>
To:     Marek Vasut <marek.vasut@...il.com>
Cc:     linux-mtd@...ts.infradead.org,
        linux-kernel <linux-kernel@...r.kernel.org>,
        Brian Norris <computersforpeace@...il.com>,
        Richard Weinberger <richard@....at>,
        David Woodhouse <dwmw2@...radead.org>,
        Boris Brezillon <bbrezillon@...nel.org>,
        Tudor Ambarus <tudor.ambarus@...rochip.com>
Subject: Re: [PATCH] mtd: spi-nor: enable 4B opcodes for n25q256a

On Fri, May 3, 2019 at 12:00 PM Marek Vasut <marek.vasut@...il.com> wrote:
>
> On 5/3/19 10:53 AM, Simon Goldschmidt wrote:
> > Tested on socfpga cyclone5 where this is required to ensure that the
> > boot rom can access this flash after warm reboot.
>
> Are you sure _all_ variants of the N25Q256 support 4NB opcodes ?
> I think there were some which didn't, but I might be wrong.

Oh, damn, you're right. The documentation [1] statest that 4-byte erase and
program opcodes are only supported for part numbers N25Q256A83ESF40x,
N25Q256A83E1240x and N25QA83ESFA0F.

Any idea of how I can still enable 4-byte opcodes for my chip?

Regards,
Simon

>
> > Signed-off-by: Simon Goldschmidt <simon.k.r.goldschmidt@...il.com>
> > ---
> >
> >  drivers/mtd/spi-nor/spi-nor.c | 2 +-
> >  1 file changed, 1 insertion(+), 1 deletion(-)
> >
> > diff --git a/drivers/mtd/spi-nor/spi-nor.c b/drivers/mtd/spi-nor/spi-nor.c
> > index fae147452..4cdec2cc2 100644
> > --- a/drivers/mtd/spi-nor/spi-nor.c
> > +++ b/drivers/mtd/spi-nor/spi-nor.c
> > @@ -1874,7 +1874,7 @@ static const struct flash_info spi_nor_ids[] = {
> >       { "n25q064a",    INFO(0x20bb17, 0, 64 * 1024,  128, SECT_4K | SPI_NOR_QUAD_READ) },
> >       { "n25q128a11",  INFO(0x20bb18, 0, 64 * 1024,  256, SECT_4K | SPI_NOR_QUAD_READ) },
> >       { "n25q128a13",  INFO(0x20ba18, 0, 64 * 1024,  256, SECT_4K | SPI_NOR_QUAD_READ) },
> > -     { "n25q256a",    INFO(0x20ba19, 0, 64 * 1024,  512, SECT_4K | SPI_NOR_DUAL_READ | SPI_NOR_QUAD_READ) },
> > +     { "n25q256a",    INFO(0x20ba19, 0, 64 * 1024,  512, SECT_4K | SPI_NOR_DUAL_READ | SPI_NOR_QUAD_READ | SPI_NOR_4B_OPCODES) },
> >       { "n25q256ax1",  INFO(0x20bb19, 0, 64 * 1024,  512, SECT_4K | SPI_NOR_QUAD_READ) },
> >       { "n25q512a",    INFO(0x20bb20, 0, 64 * 1024, 1024, SECT_4K | USE_FSR | SPI_NOR_QUAD_READ) },
> >       { "n25q512ax3",  INFO(0x20ba20, 0, 64 * 1024, 1024, SECT_4K | USE_FSR | SPI_NOR_QUAD_READ) },
> >
>
>