linux-kernel - Re: wl1251 NVS calibration data format

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Message-Id: <201612241357.52086@pali>
Date:   Sat, 24 Dec 2016 13:57:52 +0100
From:   Pali Rohár <pali.rohar@...il.com>
To:     Sebastian Reichel <sre@...nel.org>
Cc:     Gery Kahn <gery.kahn@...il.com>, Shahar Lev <shahar@...ery.com>,
        Kalle Valo <kvalo@...eaurora.org>,
        linux-wireless@...r.kernel.org, linux-kernel@...r.kernel.org,
        Pavel Machek <pavel@....cz>,
        Ivaylo Dimitrov <ivo.g.dimitrov.75@...il.com>
Subject: Re: wl1251 NVS calibration data format

On Saturday 17 December 2016 12:14:50 Pali Rohár wrote:
> I will try to play with driver if it is really truth!
> 
> I already looked into original TI's multiplatform HAL driver for
> wl1251 chip (big mess) and found there that there is wl1251 command
> to read mac address from chip. It could be done by this wl1251
> function:
> 
> wl1251_cmd_interrogate(wl, DOT11_STATION_ID, mac, sizeof(*mac))
> 
> (same id as for setting permanent mac address, but opposite to read
> it)

Confirmed! Calling that function (before setting real linux mac address) 
returns MAC address 00:00:20:07:03:09.

Changing NVS data at position 0x1c-0x21 changes also what above function 
returns.

So really at position 0x1c-0x21 in NVS data is stored MAC address (in 
reverse order). Just default is some unknown 00:00:20:07:03:09.

So MAC address is really part of NVS data.

-- 
Pali Rohár
pali.rohar@...il.com

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