From mboxrd@z Thu Jan  1 00:00:00 1970
From: Marek Vasut <marek.vasut@gmail.com>
Date: Fri, 16 Dec 2011 11:56:12 +0100
Subject: [U-Boot] [PATCH v2 1/3] mx28: Let imx_get_mac_from_fuse be
	common for mx28
In-Reply-To: <4EEB2385.40407@denx.de>
References: <1323966067-28333-1-git-send-email-fabio.estevam@freescale.com>
	<201112161139.47375.marek.vasut@gmail.com> <4EEB2385.40407@denx.de>
Message-ID: <201112161156.12732.marek.vasut@gmail.com>
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To: u-boot@lists.denx.de

> On 16/12/2011 11:39, Marek Vasut wrote:
> >> Hi Marek,
> > 
> > Hi Stefano,
> > 
> > DISCLAIMER: I'm terribly tired today, had early class.
> 
> ok, I understand..;-)
> 
> > You disable fuses and use ethaddr. Why do we need them? We don't, but the
> > hardware is in the CPU and someone might use it so let's support it.
> 
> Exactly - see also othe IMX SOCs.
> 
> >> In a standard way, the environment must be adapted for each board to
> >> store the MAC address in the ethaddr variable. The reason to get the MAC
> >> directly from the hardware is that it is not required a specific initial
> >> setup for each board, and that simplifies the production and the
> >> delivery of the boards.
> > 
> > Sure, but the OCOTP capacity here is limited. But there was approach from
> > Fabio/me how to make the OCOTP good enough for two NICs even.
> 
> And this is nice.
> 
> > * The idea is to let user configure the top 2 bytes per-device (which is
> > the most likely case).
> 
> This is exactly what I meant.
> 
> > * Introduce mac_modify(int fec, char *mac) function, which will be called
> > from imx_get_mac_from_fuse()
> > * The function will adjust the MAC, for example by setting top two bytes
> > to preconfigured data, bottom four bytes from OCOTP and the last bit of
> > the MAC from "int fec", which is 0 for FEC0 and 1 for FEC1. This should
> > be sufficient for most people.
> 
> Exactly !
> 
> > * The function will be weak so it can be overridden to your hearts
> > content.
> 
> Right !
> 
> Stefano

And it was mostly Fabio's idea I'd say ;-)

M