DIY EHCI debug dongle
An EHCI debug dongle can be built using two Cypress FX2LP prototyping boards with CY7C68013A. There are a few boards in the 10-15 EUR pricerange to choose from and a dozen suppliers in ebay.
A slower uni-directional boot console has been demonstrated to work with one such board and a TTL-UART-to-USB adapter.
Schematic is modified from Cypress Application Note AN63787 .
Firmware is built with sdcc using fx2lib.
Original git repository . Offline.
Recent updates are here .