netdev - Re: [Uclinux-dist-devel] [PATCH 01/01] smsc911x: fix MAC addresssetting after reset

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Date:	Thu, 5 Jun 2008 10:47:00 +0100
From:	Steve.Glendinning@...c.com
To:	Jens Gehrlein <sew_s@....de>
Cc:	netdev@...r.kernel.org
Subject: Re: [Uclinux-dist-devel] [PATCH 01/01] smsc911x: fix MAC addresssetting
 after reset

Hi Jens,

> Sorry. Newbie question:
> How can I pass the MAC address via kernel command line for this driver? 
> Is there a predefined parameter?
> My problem is:
> U-Boot resets the chip after each completed transfer. Wolfgang Denk 
> suggested to pass the MAC address via kernel command line. I need the 
> ethernet device at kernel startup to mount a root filesystem via NFS, so 

> I added the platform device in my board specific code as shown below (it 

> still relates to the old driver).
> Should I patch the driver directly to get the MAC address via __setup()
> or can I pass the MAC address via the device structures.
> 
> What do you suggest?

The smsc911x driver accepts mac addresses set "by configuration", so if 
brought up after boot you could assign the mac address like this:

ifconfig eth0 hw ether 00:11:22:33:44:55 up

But as you're using an NFS root, you need to assign the mac address during 
boot.  I'm not sure of the best way to do this, there isn't currently a 
dev_addr field in smsc911x_platform_config, but you could add one.

Alternatively, if the bootloader already sets the mac address you could 
modify the driver to read it off the device (into dev->dev_addr) before 
resetting it?

Regards,
--
Steve Glendinning
SMSC GmbH
m: +44 777 933 9124
e: steve.glendinning@...c.com

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