linux-kernel - Re: [RFC] [PATCH] Device Tree on ARM platform

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Message-Id: <20090527.143516.-1836205167.imp@bsdimp.com>
Date:	Wed, 27 May 2009 14:35:16 -0600 (MDT)
From:	"M. Warner Losh" <imp@...imp.com>
To:	davem@...emloft.net
Cc:	timur@...escale.com, rmk+lkml@....linux.org.uk,
	devicetree-discuss@...abs.org, linux-kernel@...r.kernel.org,
	scottwood@...escale.com, yuan-bo.ye@...orola.com,
	linux-arm-kernel@...ts.arm.linux.org.uk
Subject: Re: [RFC] [PATCH] Device Tree on ARM platform

In message: <20090527.132553.40558501.davem@...emloft.net>
            David Miller <davem@...emloft.net> writes:
: From: Timur Tabi <timur@...escale.com>
: Date: Wed, 27 May 2009 14:54:14 -0500
: 
: > How does a Linux driver normally get a MAC address if it's not
: > passed via the device tree and it isn't already programmed in the
: > hardware?  Is there some file in /etc that stores these things?
: 
: It depends.  Some devices have EEPROM's that store the permanently
: assigned MAC address, some have NVRAM for this, and yet other's put it
: into the PCI ROM.

Some also put it into their CIS for things like PC Card, CardBus and
SDIO too.  It is the definition of device specific :).

: Some platforms that have real OF device trees often do not put the
: permanent MAC address into the EEPROM or NVRAM even if it is
: customary to do so on a particular device.  The MAC has to be
: obtained from the OF device tree.

This is but one of many ways to get it...

Warner
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