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 for barebox@lists.infradead.org; Fri, 28 Sep 2012 14:39:41 +0000
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Date: Fri, 28 Sep 2012 16:39:33 +0200
From: Maxime Ripard <maxime.ripard@free-electrons.com>
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Subject: Re: Writing to the OCOTP on mx28 boards
To: Sascha Hauer <s.hauer@pengutronix.de>
Cc: barebox@lists.infradead.org, Brian Lilly <brian@crystalfontz.com>

Hi Sascha,

Le 28/09/2012 14:42, Sascha Hauer a =E9crit :
> On Fri, Sep 28, 2012 at 02:23:32PM +0200, Maxime Ripard wrote:
>> Le 28/09/2012 14:08, Maxime Ripard a =E9crit :
>>> Hi everyone,
>>>
>>> I'm trying to write down some data to the /dev/ocotp file, which is
>>> basically a one time programming chip containing four bytes.
>>>
>>> Using the command mw -b -d /dev/ocotp 0-3 0x01020304 writes down only
>>> "4" to the first byte of the OCOTP, which is not quite what I was
>>> expecting. What's the correct syntax for the mw command?
>>
>> Ok, just found out, it should be
>> mw -l -d /dev/ocotp 0-3 0x01020304
> =

> Not quite. 0-3 is wrong, though appearantly happens to work. It should
> be:
> =

> mw -d /dev/ocotp 0 0x01020304
> =

> (-l can be skipped, as 32bit accesses are default). If you want to write
> multiple words you can do a:
> =

> mw -d /dev/ocotp 0 0xdeadbeef 0x12345678 0x11223344
> =

> The 0-3 notation is only for 'md'

Ok, I see.

Thanks!

Maxime

-- =

Maxime Ripard, Free Electrons
Kernel, drivers, real-time and embedded Linux
development, consulting, training and support.
http://free-electrons.com

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