From: khilman@baylibre.com (Kevin Hilman)
To: linux-arm-kernel@lists.infradead.org
Subject: [PATCH] ARM: davinci: da850-evm: fix read access to SPI flash
Date: Tue, 17 Jan 2017 16:25:23 -0800 [thread overview]
Message-ID: <m237gh2ozw.fsf@baylibre.com> (raw)
In-Reply-To: <20170117125742.9536-1-fparent@baylibre.com> (Fabien Parent's message of "Tue, 17 Jan 2017 13:57:42 +0100")
Fabien Parent <fparent@baylibre.com> writes:
> Read access to the SPI flash are broken on da850-evm, i.e. the data
> read is not what is actually programmed on the flash.
> According to the datasheet for the M25P64 part present on the da850-evm,
> if the SPI frequency is higher than 20MHz then the READ command is not
> usable anymore and only the FAST_READ command can be used to read data.
>
> This commit specifies in the DTS that we should use FAST_READ command
> instead of the READ command.
>
> Signed-off-by: Fabien Parent <fparent@baylibre.com>
Tested on da850-evm on top of v4.10-rc3. This gets the DT boot
functionatliy in line with the legacy (board-file) boot.
Tested-by: Kevin Hilman <khilman@baylibre.com>
Kevin
WARNING: multiple messages have this Message-ID (diff)
From: Kevin Hilman <khilman-rdvid1DuHRBWk0Htik3J/w@public.gmane.org>
To: Fabien Parent <fparent-rdvid1DuHRBWk0Htik3J/w@public.gmane.org>
Cc: devicetree-u79uwXL29TY76Z2rM5mHXA@public.gmane.org,
linux-arm-kernel-IAPFreCvJWM7uuMidbF8XUB+6BGkLq7r@public.gmane.org,
linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org,
nsekhar-l0cyMroinI0@public.gmane.org,
robh+dt-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org,
mark.rutland-5wv7dgnIgG8@public.gmane.org
Subject: Re: [PATCH] ARM: davinci: da850-evm: fix read access to SPI flash
Date: Tue, 17 Jan 2017 16:25:23 -0800 [thread overview]
Message-ID: <m237gh2ozw.fsf@baylibre.com> (raw)
In-Reply-To: <20170117125742.9536-1-fparent-rdvid1DuHRBWk0Htik3J/w@public.gmane.org> (Fabien Parent's message of "Tue, 17 Jan 2017 13:57:42 +0100")
Fabien Parent <fparent-rdvid1DuHRBWk0Htik3J/w@public.gmane.org> writes:
> Read access to the SPI flash are broken on da850-evm, i.e. the data
> read is not what is actually programmed on the flash.
> According to the datasheet for the M25P64 part present on the da850-evm,
> if the SPI frequency is higher than 20MHz then the READ command is not
> usable anymore and only the FAST_READ command can be used to read data.
>
> This commit specifies in the DTS that we should use FAST_READ command
> instead of the READ command.
>
> Signed-off-by: Fabien Parent <fparent-rdvid1DuHRBWk0Htik3J/w@public.gmane.org>
Tested on da850-evm on top of v4.10-rc3. This gets the DT boot
functionatliy in line with the legacy (board-file) boot.
Tested-by: Kevin Hilman <khilman-rdvid1DuHRBWk0Htik3J/w@public.gmane.org>
Kevin
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WARNING: multiple messages have this Message-ID (diff)
From: Kevin Hilman <khilman@baylibre.com>
To: Fabien Parent <fparent@baylibre.com>
Cc: devicetree@vger.kernel.org, linux-arm-kernel@lists.infradead.org,
linux-kernel@vger.kernel.org, nsekhar@ti.com, robh+dt@kernel.org,
mark.rutland@arm.com
Subject: Re: [PATCH] ARM: davinci: da850-evm: fix read access to SPI flash
Date: Tue, 17 Jan 2017 16:25:23 -0800 [thread overview]
Message-ID: <m237gh2ozw.fsf@baylibre.com> (raw)
In-Reply-To: <20170117125742.9536-1-fparent@baylibre.com> (Fabien Parent's message of "Tue, 17 Jan 2017 13:57:42 +0100")
Fabien Parent <fparent@baylibre.com> writes:
> Read access to the SPI flash are broken on da850-evm, i.e. the data
> read is not what is actually programmed on the flash.
> According to the datasheet for the M25P64 part present on the da850-evm,
> if the SPI frequency is higher than 20MHz then the READ command is not
> usable anymore and only the FAST_READ command can be used to read data.
>
> This commit specifies in the DTS that we should use FAST_READ command
> instead of the READ command.
>
> Signed-off-by: Fabien Parent <fparent@baylibre.com>
Tested on da850-evm on top of v4.10-rc3. This gets the DT boot
functionatliy in line with the legacy (board-file) boot.
Tested-by: Kevin Hilman <khilman@baylibre.com>
Kevin
next prev parent reply other threads:[~2017-01-18 0:25 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-01-17 12:57 [PATCH] ARM: davinci: da850-evm: fix read access to SPI flash Fabien Parent
2017-01-17 12:57 ` Fabien Parent
2017-01-18 0:25 ` Kevin Hilman [this message]
2017-01-18 0:25 ` Kevin Hilman
2017-01-18 0:25 ` Kevin Hilman
2017-01-18 9:58 ` Sekhar Nori
2017-01-18 9:58 ` Sekhar Nori
2017-01-18 9:58 ` Sekhar Nori
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