linux-kernel - RE: [v6] wlcore: add missing nvs file name info for wilink8

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Date:   Thu, 10 Aug 2017 07:59:32 +0000
From:   "Reizer, Eyal" <eyalr@...com>
To:     Kalle Valo <kvalo@...eaurora.org>
CC:     Tony Lindgren <tony@...mide.com>,
        "linux-wireless@...r.kernel.org" <linux-wireless@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "sebastian.reichel@...labora.co.uk" 
        <sebastian.reichel@...labora.co.uk>,
        Julian Calaby <julian.calaby@...il.com>
Subject: RE: [v6] wlcore: add missing nvs file name info for wilink8

> 
> >> The fact that is old does not change a thing, we still need to
> >> support it no matter what the data sheet and your system design
> >> says. A fix that breaks other things is not really a fix :)
> >>
> >
> > Sure, just want to make sure we are not trying to add work around just for
> > A couple of faulty devices.
> >
> >> > I have verified using a couple of com6 modules with an am335x-evm and
> >> they had mac addresses read ok.
> >>
> >> Sounds like there are multiple variants of the wl12xx
> >> available then.
> >>
> > I am trying to find out internally if there is a possibility that there were
> devices
> > Produced in the past where the internal fuses were not programmed with
> a valid
> > Address before being assembled into the modules.
> 
> Just a general remark, based on my past experience, you can't really
> know what hardware is out there, no matter how someone in the company
> claims otherwise. Uncalibrated devices, prototypes and calibration data
> broken are all possible and better be preparared for that in the driver.
> 
> It's a good idea at least to detect and print a proper error message if
> the calibration data is broken. But if the data on the device only
> consists of MAC address and nothing else, then I guess using a random
> address is fine.
> 

Understood. I will handle the zero mac address case and use random mac instaed.
Just trying to find out how common it is as it seems strange devices like that found their way to boards that we shipped to customers.

Best Regards,
Eyal