From mboxrd@z Thu Jan  1 00:00:00 1970
From: sebastian.hesselbarth@gmail.com (Sebastian Hesselbarth)
Date: Wed, 22 May 2013 20:51:26 +0200
Subject: [PATCH v4 06/12] ARM: dove: add gigabit ethernet and mvmdio device
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In-Reply-To: <20130522182448.GA17206@obsidianresearch.com>
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 <20130521174849.GL26249@lunn.ch> <519C9333.20609@gmail.com>
 <519C9822.9040909@windriver.com> <519C9A66.3050807@gmail.com>
 <20130522131010.GB31290@titan.lakedaemon.net>
 <20130522165908.GB12320@obsidianresearch.com> <519D0143.1000203@gmail.com>
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To: linux-arm-kernel@lists.infradead.org
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On 05/22/2013 08:24 PM, Jason Gunthorpe wrote:
> On Wed, May 22, 2013 at 07:32:51PM +0200, Sebastian Hesselbarth wrote:
>> Not neccessary anyway, after talking Jason C in a Kirkwood-only
>> workaround I prepared a patch that reads mac address registers early
>> and stores it in the local-mac-address property.
>
> That sounds great, but, FWIW, our bootloaders don't set the MAC
> address registers. Does the work around only trigger if the
> local-mac-address property is 0?

I already thought about bootloaders not setting the register, but I will
not start parsing 1001 places for a valid MAC only for those. Also
reading the MAC address registers is default behavior of mv643xx_eth if
no MAC address is passed through platform_data.

But you are right, there is plenty of sanity checks in the workaround to
ensure that local-mac-address is only overwritten by it when
- you are on DT
- there is no valid MAC address in that node (of_get_mac_address)
- there is a local-mac-address property with a length of 6 bytes

So this workaround only applies on DT booted kernels with no mac set in
DT.

Sebastian