General Description: A MAP code change in 4.1i SP1 that fixed an RPM processing bug has broken RPM processing for some designs that used to work in the original 4.1i. The affected designs have carry chains that span multiple RPMs. The failure mode is the following pack error:
ERROR:Pack - A collection of symbols which have restrictive placement or routing requirements has symbols contained within two different RPMs, "aaa" and "bbb". The collection is: A carry chain starting with carry mux "xyz". Adjust the RPM constraints appropriately.
This problem will be fixed in the next major software release after 4.1i.
Meanwhile, you can work around the problem by setting the following environment variable to restore the original behavior: