Ethernet LAN Can a boot ROM redefine a MAC address?

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Subject Author Date
Can a boot ROM redefine a MAC address? shrike@cyberspace.org 03-06-09
Posted by shrike@cyberspace.org on March 6, 2009, 7:17 pm
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Howdy,

For diagnostic purposes I would like to install a board with a
preconfigured MAC address.

I know that most drivers permit changing the MAC from the OS, but Is
this typically a configuration attribute accessible from a boot ROM?

Thanks!

Posted by glen herrmannsfeldt on March 8, 2009, 5:46 am
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> For diagnostic purposes I would like to install a board with a
> preconfigured MAC address.

> I know that most drivers permit changing the MAC from the OS, but Is
> this typically a configuration attribute accessible from a boot ROM?

Traditionally, it was on a separate ROM, read by the driver
and then written to the MAC chip. It might be that now it
can be done on one chip. In any case, the boot ROM is software,
and should be able to do everything that software could normally do.

-- glen

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