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

Gregory CLEMENT gclement00 at gmail.com
Thu Sep 20 11:24:11 EDT 2012

2012/9/20 Wolfgang Denk <wd at denx.de>:
> Dear Maxime,
> In message <505B1FC2.2090609 at free-electrons.com> you wrote:
>> > Fix it and send patch, so this problem doesn't spread.
>> I'm sorry, but you still miss the point.
> I'm not so sure about this.
>> 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.
> With device tree supoort enabled, the regular way to pass the MAC
> address to a network interface (that needs one) is through the device
> tree.
> There are several options how such information gets there.  Boot
> loaders with built-in DT support may fill in the MAC address
> information into the DT before passing it to the Linux kernel.
> If your boot method does not allow such dynamic adjustment, you ould
> provide a statically configured device tree, which already includes
> the MAC address.
>> The kernel shouldn't rely on a particular feature of a given bootloader.
> 100% agreed.  And it does not.  It always uses the respective
> information from the device tree.

I thought that device tree should provide information that we can't get
by the hardware itslef. Here, if the hardware can provide the MAC address,
why should we ignore it?

> So when you use bootlets, all you need to do is to insert the
> respective MAC address entry to your device tree definition.

> Best regards,
> Wolfgang Denk
> --
> DENX Software Engineering GmbH,     MD: Wolfgang Denk & Detlev Zundel
> HRB 165235 Munich, Office: Kirchenstr.5, D-82194 Groebenzell, Germany
> Phone: (+49)-8142-66989-10 Fax: (+49)-8142-66989-80 Email: wd at denx.de
> Every program has at least one bug and can be shortened by  at  least
> one  instruction  --  from  which,  by induction, one can deduce that
> every program can be reduced to one instruction which doesn't work.
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