From: Rob Herring <robh@kernel.org>
To: Cyrille Pitchen <cyrille.pitchen@atmel.com>
Cc: computersforpeace@gmail.com, linux-mtd@lists.infradead.org,
nicolas.ferre@atmel.com, boris.brezillon@free-electrons.com,
marex@denx.de, linux-kernel@vger.kernel.org,
devicetree@vger.kernel.org, pawel.moll@arm.com,
mark.rutland@arm.com, ijc+devicetree@hellion.org.uk,
galak@codeaurora.org
Subject: Re: [PATCH v4 2/2] doc: dt: mtd: add a DT property to enable the use of 4byte-address op codes
Date: Thu, 31 Mar 2016 09:19:49 -0500 [thread overview]
Message-ID: <20160331141949.GA20345@rob-hp-laptop> (raw)
In-Reply-To: <320899457d15b85eb0b71edd566cae035d7e1f55.1459251929.git.cyrille.pitchen@atmel.com>
On Tue, Mar 29, 2016 at 02:24:13PM +0200, Cyrille Pitchen wrote:
> This patch adds a new optional DT property which enables an alternative
> way of supporting memory size above 16MiB (128Mib). This new mechanism
> translates the regular 3byte-address op codes into their 4byte-address
> version whereas the old/default mecanism makes the SPI memory enter its
> 4byte-address mode, which has annoying side effects for early bootloaders.
>
> We cannot discover at run time whether the SPI NOR memory supports the
> 4byte-address op codes. For instance both Macronix MX25L25635E and
> MX25L25673G share the same JEDEC ID (C22019 without any extension byte).
> However the first one doesn't support 4byte-address op codes whereas the
> second one does.
>
> Signed-off-by: Cyrille Pitchen <cyrille.pitchen@atmel.com>
> ---
> Documentation/devicetree/bindings/mtd/jedec,spi-nor.txt | 11 +++++++++++
> 1 file changed, 11 insertions(+)
Acked-by: Rob Herring <robh@kernel.org>
prev parent reply other threads:[~2016-03-31 14:19 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-03-29 12:24 [PATCH v4 0/2] mtd: spi-nor: add an alternative method to support memory > 16MiB Cyrille Pitchen
[not found] ` <cover.1459251929.git.cyrille.pitchen-AIFe0yeh4nAAvxtiuMwx3w@public.gmane.org>
2016-03-29 12:24 ` [PATCH v4 1/2] mtd: spi-nor: add an alternative method to support memory >16MiB Cyrille Pitchen
2016-03-29 12:24 ` [PATCH v4 2/2] doc: dt: mtd: add a DT property to enable the use of 4byte-address op codes Cyrille Pitchen
2016-03-31 14:19 ` Rob Herring [this message]
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