by FHuettig » Fri Jul 18, 2014 6:05 pm
@SeanS & @perles and anyone else who wants to try this, please be aware that for this to work you have to have a board with a flash image that turns on CR10 at boot time. If you only have one green LED when the board boots then this will not work, USB will be held in reset forever as will the Ethernet. The kickstarter boards did NOT have this feature, the 7010-based boards do have it as well as some recent boards and all boards going forward.
@Frida, I'll take a closer look and for a long time now I've wanted to snoop the ULPI with a logic analyzer so I'll try to do that too. Xilinx does intend this interface to be used the way we are using it, for example the Zedboard, plus those pins including STP should be pulled high until the pin-muxing has been sorted out and they become a real ULPI interface. However what you describe is very plausible.
-- Fred -- Hardware Guy --