I made a custom Tobi-Duo (the only change to the Tobi-Duo schematic was the
addition of the FTDI usb-serial) to do some in-line network functions, but
I am having trouble getting the lan9221 chips to work. I triple checked
and had a friend independently verify that that I copied the Tobi-Duo
schematic perfectly, but U-boot says "No ethernet found". I have several
Overo Waters, all of which work on the Tobi-Duo, and on regular Tobi's.
It looks to me like there is a hardware problem, but I have no idea how to
diagnose it. I cannot use ethtool to send messages to either interface
because the kernel doesn't load any ethernet functionality because it can't
communicate with the lan9221's when it boots up. I could very easily
diagnose the problem if I had a way to send messages out the MII. I
searched pretty deep in the archives and I couldn't find answers, so
hopefully someone can answer these newbie questions, or point me to where
they have been answered previously:
Is there some configuration that has to be done on the lan9221's to get
them to work together on one Overo, or even by themselves?
How do I force an ethernet interface to be installed after Uboot decides
there isn't ethernet?
The datasheet gives no information on the smsc lan9221 VDD18CORE pin other
than a name, but on my board that pin produces 2.4V, while on the Tobi and
Tobi duo it produces 1.8V. Is this a configuration issue?