From: Don Fry <brazilnut@us.ibm.com>
To: broonie@sirena.org.uk (Mark Brown)
Cc: netdev@oss.sgi.com
Subject: Re: Ethernet MAC address question
Date: Tue, 15 Jun 2004 08:38:19 -0700 (PDT) [thread overview]
Message-ID: <200406151538.i5FFcJ720553@localhost.localdomain> (raw)
In-Reply-To: <20040615095817.GA16523@projectcolo.org.uk> from "Mark Brown" at Jun 15, 2004 10:58:17 AM
So how does the driver distinguish between a valid, but incorrect MAC
address, and the 'correct' MAC address? The incorrect one that is the
value that just happened to be in the uninitialized volatile registers,
and the correct address which some magic platform means loaded into the
same, but this time initialized, volatile registers.
> > However there are a few cases where some magic platform means loads the
> > MAC address into the (volatile) MAC address registers, and that's the
> > only source of an accurate MAC address for those people.
>
> This is reasonably common on embedded systems - often there won't be
> SEPROMs for individual devices and the MAC address will be stored in
> flash or similar and read by the bootloader.
>
--
Don Fry
brazilnut@us.ibm.com
next prev parent reply other threads:[~2004-06-15 15:38 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2004-06-14 22:02 Ethernet MAC address question Don Fry
2004-06-14 23:34 ` Jeff Garzik
2004-06-15 4:17 ` Luis R. Rodriguez
2004-06-15 9:58 ` Mark Brown
2004-06-15 15:38 ` Don Fry [this message]
2004-06-15 16:11 ` Jeff Garzik
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