topic Re: Not getting link 52233 in ColdFire/68K Microcontrollers and Processors

Not getting link 52233

alager — Wed, 11 Feb 2009 06:11:49 GMT

Watching the coldfire lite code step through mcf5223x_ePHY_init(), I see it go through each stage: autonegotiation attempt, 100Mb half duplex, 10Mb half duplex and then fall into the "else could not establish link".

What should I be looking at/for to get the link going?

Thanks,
Aaron

Re: Not getting link 52233

mjbcswitzerland — Wed, 11 Feb 2009 07:53:31 GMT

Hi Aaron

I have added the link to your photos of the waveform on the LAN. Maybe an Ethernet HW expert in the forum can identify something for you.

http://www.utasker.com/forum/index.php?topic=517.0

Regards

Mark

Re: Not getting link 52233

alager — Thu, 12 Feb 2009 00:12:52 GMT

Thanks Mark!

The link seems to have an extra http in it. This one should fix it.
www.utasker.com/forum/index.php?topic=517.0

Aaron

Message Edited by alager on 2009-02-11 04:13 PM

Re: Not getting link 52233

alager — Thu, 12 Feb 2009 08:40:04 GMT

All is well again. Seems I just needed a separate set of eyes to see that I forgot to pull up the center tap.

Aaron

Re: Not getting link 52233

DavidS — Fri, 13 Feb 2009 04:41:03 GMT

Hi Aaron,

Assuming you are looking at the latest version of the code (Rev3.2), if the PHY init code doesn't find a link, the OS still boots up and you have access to the system via the UART interface.

If the Ethernet cable is disconnected and reconnected to board or router/switch, ColdFire will do software reset and start the boot process as well as look for link.

If you boot/reset without Ethernet connected you should see following on terminal:

.....COULD NOT ESTABLISH LINK.....

Running ColdFire TCP/IP-Lite stack Revision 3.1

Copyright 2008 by Freescale Semiconductor Inc.
Use of this software is controlled by the agreement
found in the project LICENSE.H file.
Built on Feb 12 2009 14:34:23

If you connect the Ethernet cable you should see following on terminal:

100bT - Half Dup

Running ColdFire TCP/IP-Lite stack Revision 3.1

Copyright 2008 by Freescale Semiconductor Inc.
Use of this software is controlled by the agreement
found in the project LICENSE.H file.
Built on Feb 12 2009 14:34:23

Regards,

David