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3.1i SP6 Virtex/Spartan-II MAP - Crash during unrelated packing on PC only.
A problem was introduced in 3.1i Service Pack 6 that causes
Virtex/Spartan-II MAP to crash if unrelated packing occurs.
Unrelated packing only occurs if it is needed to fit the device
to the density specified by the pack factor. The default is "-c 100".
This is a PC-only problem.