linux-kernel - Re: [PATCH] ARM: mvebu: add Device Tree for the Armada 385 RD board

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Message-ID: <20140306172339.GP4780@lunn.ch>
Date:	Thu, 6 Mar 2014 18:23:39 +0100
From:	Andrew Lunn <andrew@...n.ch>
To:	Ezequiel Garcia <ezequiel.garcia@...e-electrons.com>
Cc:	Gregory CLEMENT <gregory.clement@...e-electrons.com>,
	Thomas Petazzoni <thomas.petazzoni@...e-electrons.com>,
	Andrew Lunn <andrew@...n.ch>,
	Jason Cooper <jason@...edaemon.net>,
	Tawfik Bayouk <tawfik@...vell.com>, devicetree@...r.kernel.org,
	linux-kernel@...r.kernel.org, Nadav Haklai <nadavh@...vell.com>,
	Lior Amsalem <alior@...vell.com>,
	linux-arm-kernel@...ts.infradead.org,
	Sebastian Hesselbarth <sebastian.hesselbarth@...il.com>
Subject: Re: [PATCH] ARM: mvebu: add Device Tree for the Armada 385 RD board

> Can't we fix this so the probe order doesn't affect the name?
> 
> Is that sane?

You are not supposed to trust the device name, since probing can
happen in parallel, on different buses. udev should have rules to name
the interfaces based on the MAC address. On my Debian system i have:

/etc/udev/rules.d/70-persistent-net.rules

So what is important is that the MAC addresses are assigned correctly
to the device. And DT does that based on MMIO address, so should be
reliable, independent of probe order.

   Andrew
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