[U-Boot-Users] ethernet on FCC

Lei Sun leisun124 at gmail.com
Wed Nov 8 22:10:55 CET 2006

I changed the last byte (count start from left). I set the MAC via
environment "ethaddr", I've also defined "CONFIG_ETHADDR" so to force
it to fixed value.  My ethereal did show the correct source MAC
address for the broadcast ARP request. The host replied with unicast
ARP reply, that's when my board failed to get it. Haven't tried if my
board could get broadcasted packet yet.


On 11/8/06, Ben Warren <bwarren at qstreams.com> wrote:
> On Wed, 2006-11-08 at 13:59 -0500, Lei Sun wrote:
> > Yeah, i suppose so. I connect my host to the board with a hub, give
> > them static IP, and set the MAC address to be the same as my host's
> > MAC, except one byte. Then I sniff the packet on my host using
> > ethereal.
> Which byte do you change?  Don't touch the left-most one, as its bits
> have special meaning.  When you say you 'set the MAC address', how do
> you do it?  Does the 'Source Address' field in the ARP packet sent by
> your board match the MAC address that you set?
> > Is the MAC address being compared in CPM's micro code ?
> Unicast addresses are compared to registers in the CPM, which may be
> implemented in microcode but that's neither here nor there.
> regards,
> Ben

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