Subject: [PATCH] ARM: mxs: m28evk: Disable OCOTP OUI loading

From: [email-masked] (Maxime Ripard)
Date: Thu, 20 Sep 2012 19:01:20 +0200

Le 20/09/2012 18:33, Marek Vasut a ?crit :
> Dear Maxime Ripard,
> 
>> Hi Marek,
>>
>> Le 20/09/2012 15:10, Marek Vasut a ?crit :
>>>>> If barebox can't handle even basic DT fixup, it's broken.
>>>>
>>>> It can. It maybe was just not needed up to now, dunno.
>>>
>>> Fix it and send patch, so this problem doesn't spread.
>>
>> I'm sorry, but you still miss the point.
>>
>> If someone wants to use another bootloader than U-boot (or a possible
>> patched barebox), or none other than the bootlets to boot directly the
>> Linux (with an appended device tree), you will still have no way to get
>> the NIC from the OCOTP, and I'm sorry, but it is just wrong.
>>
>> The kernel shouldn't rely on a particular feature of a given bootloader.
> 
> So what do you think about this patch (skip loading from OCOTP if it's already 
> present in DT):
> 
> diff --git a/arch/arm/mach-mxs/mach-mxs.c b/arch/arm/mach-mxs/mach-mxs.c
> index 71d47f5..4f014ef 100644
> --- a/arch/arm/mach-mxs/mach-mxs.c
> +++ b/arch/arm/mach-mxs/mach-mxs.c
> @@ -175,6 +175,10 @@ static void __init update_fec_mac_prop(enum mac_oui oui)
>                 np = of_find_compatible_node(from, NULL, "fsl,imx28-fec");
>                 if (!np)
>                         return;
> +
> +               if (of_get_property(np, "local-mac-address", NULL))
> +                       continue;
> +
>                 from = np;
>  
>                 newmac = kzalloc(sizeof(*newmac) + 6, GFP_KERNEL);

That definitely looks like the best solution, yes.

You can add my Acked-by if you want.

Maxime

-- 
Maxime Ripard, Free Electrons
Kernel, drivers, real-time and embedded Linux
development, consulting, training and support.
http://free-electrons.com