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

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Date:   Thu, 10 Aug 2017 06:35:46 +0000
From:   "Reizer, Eyal" <eyalr@...com>
To:     Tony Lindgren <tony@...mide.com>
CC:     Kalle Valo <kvalo@...eaurora.org>,
        "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

> >
> > Sorry for top posting (mobile...)
> > I have verified with system design and the data sheet that every wilink 6/7
> chip has a mac address in fuse so probably the board you have (pretty old,
> right?) has this mac address in fuse. Maybe it was from very early batches?
> Anyway I see no reason to change it.
> > Anyway the calibrator can be used to store a different one into the nvs file
> that will overide it.
> 
> Well clearly at least this one does not have any valid hardware
> mac address, the hardware mac address is broken with all zeroes.
> 

Looks like it is not really all zeros but rather 00:00:00:00:00:01. 
I wonder if it is just a one board issue or not...

> It seems that you can easily add a check for empty mac address, no?
> And you already showed a version that falls back to a random mac
> address.
> 

Of course I can add a check for this but need to make sure it 
is not just one private case.
Do you happen to have another omap3-evm and can check if this is a typical case
For the wilink modules that were assembled on this EVM?
I have not seen another module here that showed this issue and want to make 
Sure it is really a common issue before adding additional checks to the kernel.

> 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.

Best Regards,
Eyal