[U-Boot-Users] [PATCH] lan91c96 driver MAC address detection
wd at denx.de
Tue May 4 14:06:10 CEST 2004
In message <409766D3.2030409 at mpc-data.co.uk> you wrote:
> > I have a minor suggestion though. Can we squelch
> > the warning for the "setenv ethaddr" case? Like so:
> Sure, I have no preference either way. I think I originally put in the
> warning as I have the impression that Wolfgang's preference is to
> have the user use the environment to set the MAC address rather than
> have it detected.
The rules are simple and documented:
o If the SROM has a valid MAC address, and there is no address in the
environment, the SROM's address is used.
o If there is no valid address in the SROM, and a definition in the
environment exists, then the value from the environment variable is
o If both the SROM and the environment contain a MAC address, and
both addresses are the same, this MAC address is used.
o If both the SROM and the environment contain a MAC address, and the
addresses differ, the value from the environment is used and a
warning is printed.
o If neither SROM nor the environment contain a MAC address, an error
> Of course the easiest way to suppress the message is to do a 'bootp'
> to read teh detected address, and then 'saveenv' to set it permenently.
You cannot use BOOTP (nor ony other network related protocol) to
detect a MAC address!!!
Software Engineering: Embedded and Realtime Systems, Embedded Linux
Phone: (+49)-8142-4596-87 Fax: (+49)-8142-4596-88 Email: wd at denx.de
It is easier to write an incorrect program than understand a correct
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