Re: [PATCH V2] ssb: Implement virtual SPROM on disk

[Larry Finger <Larry.Finger@lwfinger.net>]

On 03/22/2010 01:28 AM, Calvin Walton wrote:
> 
> I'm curious, how would this firmware-loading scheme deal with having
> multiple cards of this type installed? This seems like an unusual
> situation, but it looks like this patch will cause all of the cards to
> start up with the same MAC address due to the fixed filename.

I have a workaround for this problem based on the bus address of the device.

> Instead of using a firmware file to load in the MAC address, might it be
> possible to move the persistent MAC setting to a simple udev rule which
> generates a persistent MAC address, saves it, then sets it each boot
> using a command like "ip link set wlan0 address XX:XX:XX:XX:XX:XX" ?
> 
> This would remove the need to have this "fake" firmware file available
> at boot, provided that the driver can handle leaving the address
> unconfigured until userspace gets around to setting it. As well, it
> could be written to work with multiple cards easily, saving a different
> MAC for each.

Does anyone have any suggestions on what characteristic could be used to
generate a unique MAC address for a box in a udev rule? Unless someone proposes
a workable solution, I will push V3 of my patch with the bus address change
noted above.

Larry