Attempting to rebuild the Litex example fails

[buzmeg]

Attempting to rebuild the Litex example from scratch fails with:

ERROR  (PR2028) : The constrained location is useless in current package
ERROR  (PR2017) : 'led4' cannot be placed according to constraint, for the location is a dedicated pin (READY)
ERROR  (PR2028) : The constrained location is useless in current package
ERROR  (PR2017) : 'led5' cannot be placed according to constraint, for the location is a dedicated pin (DONE)
ERROR  (PR2028) : The constrained location is useless in current package
ERROR  (PR2017) : 'btn_n0' cannot be placed according to constraint, for the location is a dedicated pin (SSPI)

As the included bitstream does work, the issue is a mismatch in a configuration file rather than a bug in the implementation code.

Thanks.

[wonderfullook]

The solution of RP2017 ERROR Code has been written in the README markdown.