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From: Wolfgang Denk <wd@denx.de>
To: u-boot@lists.denx.de
Subject: [U-Boot] ethernet: ROM MAC address vs env variable MAC address
Date: Mon, 13 Nov 2017 20:49:02 +0100	[thread overview]
Message-ID: <20171113194902.3A0A0120504@gemini.denx.de> (raw)
In-Reply-To: <HE1PR04MB12410876E4BA09FC9CD7800C97560@HE1PR04MB1241.eurprd04.prod.outlook.com>

Dear Prabhakar,

In message <HE1PR04MB12410876E4BA09FC9CD7800C97560@HE1PR04MB1241.eurprd04.prod.outlook.com> you wrote:
> 
> Why ROM MAC address getting overwritten by environment env MAC address.  

Because in U-Boot we give the user the freedom to do what he
needs/wants to do.  Usually the environment value gets initialized
from the value in the ROM, so there is no difference anyway. But if
the user wants a specific setting, he can change it.

> MAC address is something unique and assigned to a particular device. So one should never change its MAC address.

U-Boot follows good old UNIX style here:

"UNIX was not designed to stop you from doing stupid things,  because
that would also stop you from doing clever things."       - Doug Gwyn




Best regards,

Wolfgang Denk

-- 
DENX Software Engineering GmbH,      Managing Director: Wolfgang Denk
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
If in any problem you find yourself doing an immense amount of  work,
the answer can be obtained by simple inspection.

  parent reply	other threads:[~2017-11-13 19:49 UTC|newest]

Thread overview: 4+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2017-11-08 12:02 [U-Boot] ethernet: ROM MAC address vs env variable MAC address Prabhakar Kushwaha
2017-11-09 10:14 ` Lukasz Majewski
2017-11-13 19:49 ` Wolfgang Denk [this message]
2017-11-14  9:31   ` Mike Looijmans

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