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Problem with Ethernet and Etrax 100LX on our own board


We have made our own desing using an etrax 100lx. But booting it up failed.
As we could find out the etrax doesn't give out 25MHz clock to ethernet
physical chip in network boot mode.
If we try to boot it in normal mode (must fail since flash is emtpy) we can
see some activity on flash chip select and address lines.

Any hints, debugging strategies etc?