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It seems that the contents of the small EEPROM was damaged. I managed to restore it (using the procedure described here: http://www.cypress.com/?rID=34127). The EEPROM now contains C0 B4 04 82 00 00 00 00. It enumerates as EZ-USB Advanced Development Board FX2LP (Keil monitor) and the green LED D7 lights on everytime I reset the board. However, I'm still not able to connect to the board from Keil uVision. The COM port settings in uVision are COM1 and 38400 which I believe is correct. Any ideas what could be wrong?
Problem solved: beside the problem with the EEPROM there was a problem with the COM port in my computer.