linux-kernel - Re: [PATCH] ARM: davinci: da850-evm: fix read access to SPI flash

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Message-ID: <m237gh2ozw.fsf@baylibre.com>
Date:   Tue, 17 Jan 2017 16:25:23 -0800
From:   Kevin Hilman <khilman@...libre.com>
To:     Fabien Parent <fparent@...libre.com>
Cc:     devicetree@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-kernel@...r.kernel.org, nsekhar@...com, robh+dt@...nel.org,
        mark.rutland@....com
Subject: Re: [PATCH] ARM: davinci: da850-evm: fix read access to SPI flash

Fabien Parent <fparent@...libre.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@...libre.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@...libre.com>

Kevin