Re: [microblaze-uclinux] eth0: Duplex has been changed: now FULL_DUPLEX

["Olof Backing" <olof.backing@xxxxxxxxxxxx>]

On Thu, April 24, 2008 15:16, Navya S Kamath wrote:
> I have a design on ML401 using MicroBlaze 7.00.a, both system and bus clocked at 100
> MHz. I'm using EDK 9.2i and have connected an OPB Ethernet, xps_timer and
> xps_uartlite in interrupt mode. I get
> "eth0: Duplex has been changed: now FULL_DUPLEX " message constantly printed on the
> HyperTerminal. Why is it so? How can I correct this?
>
> Attached is the boot-up message
>
> eth0: Duplex has been changed: now FULL_DUPLEX
> eth0: Link carrier lost.
>
> uclinux login: eth0: Duplex has been changed: now FULL_DUPLEX
> root
> Password: eth0: Duplex has been changed: now FULL_DUPLEX
>
> # eth0: Duplex has been changed: now FULL_DUPLEX
> ls
> bin   dev   etc   home  lib   mnt   proc  tmp   usr   var
> # eth0: Duplex has been changed: now FULL_DUPLEX
> eth0: Duplex has been changed: now FULL_DUPLEX

Either your or (more likely) the other side has a flawed auto-negotiation algorithm
for select 10/100 & half/full duplex. I have seen this on a NetBSD box some 10 years
ago when I implemented this in a VxWorks ethernet driver reading the Intel (or was
it Digital) spec for NWay. I even sent some DLink switches (the NetBSD was equipped
with a DLink nic) the same way... :)

Regards, Olof
-- 
Olof Backing
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