Configuration of my Virtex-4 device fails when I use a serial download or PROM configuration with an MCS file generated by 7.1i iMPACT.
This problem occurs because the startup clock does not change from JTAGCLK to CCLK.
To work around this issue, set the startup option correctly when generating the bitstream rather than allowing iMPACT to make the change. For more information on setting the BitGen option, please refer to the design tools manual:
This issue will be resolved in a future service pack.