From: Pali =?utf-8?q?Roh=C3=A1r?= <pali.rohar@gmail.com>
To: Kalle Valo <kvalo@codeaurora.org>, Pavel Machek <pavel@ucw.cz>,
        Ivaylo Dimitrov <ivo.g.dimitrov.75@gmail.com>,
        Sebastian Reichel <sre@kernel.org>,
        Aaro Koskinen <aaro.koskinen@iki.fi>, Tony Lindgren <tony@atomide.com>
Subject: wl1251 & mac address & calibration data
Date: Fri, 11 Nov 2016 18:20:50 +0100
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Cc: linux-wireless@vger.kernel.org, netdev@vger.kernel.org,
        linux-kernel@vger.kernel.org
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Hi! I will open discussion about mac address and calibration data for=20
wl1251 wireless chip again...

Problem: Mac address & calibration data for wl1251 chip on Nokia N900=20
are stored on second nand partition (mtd1) in special proprietary format=20
which is used only for Nokia N900 (probably on N8x0 and N9 too).=20
Wireless driver wl1251.ko cannot work without mac address and=20
calibration data.

Absence of mac address cause that driver generates random mac address at=20
every kernel boot which has couple of problems (unstable identifier of=20
wireless device due to udev permanent storage rules; unpredictable=20
behaviour for dhcp mac address assignment, mac address filtering, ...).

Currently there is no way to set (permanent) mac address for network=20
interface from userspace. And it does not make sense to implement in=20
linux kernel large parser for proprietary format of second nand=20
partition where is mac address stored only for one device -- Nokia N900.

Driver wl1251.ko loads calibration data via request_firmware() for file=20
wl1251-nvs.bin. There are some "example" calibration file in linux-
firmware repository, but it is not suitable for normal usage as real=20
calibration data are per-device specific.

So questions are:

1) How to set mac address from userspace for that wl1251 interface? In=20
userspace I can write parser for that proprietary format of nand=20
partition and extract mac address from it

2) How to send calibration data to wl1251 driver? Those are again stored=20
in proprietary format and I can write userspace parser for it.

=2D-=20
Pali Roh=C3=A1r
pali.rohar@gmail.com

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