Running into this out of memory error while running
$ make -f Makefile.vc707-u500devkit verilog
on a 8GB RAM desktop.
java -Xmx2G -Xss8M -XX:MaxPermSize=256M -cp /home/dt/f/freedom/rocket-chip/firrtl/utils/bin/firrtl.jar firrtl.Driver -i /home/dt/f/freedom/builds/vc707-u500devkit/sifive.freedom.unleashed.DevKitU500FPGADesign_WithDevKit50MHz.fir -o /home/dt/f/freedom/builds/vc707-u500devkit/sifive.freedom.unleashed.DevKitU500FPGADesign_WithDevKit50MHz.v -X verilog
OpenJDK 64-Bit Server VM warning: ignoring option MaxPermSize=256M; support was removed in 8.0
Exception in thread “main” java.lang.OutOfMemoryError: Java heap space: failed reallocation of scalar replaced objects
at java.lang.AbstractStringBuilder.(AbstractStringBuilder.java:68)
at java.lang.StringBuilder.(StringBuilder.java:89)
at org.antlr.v4.runtime.RuleContext.getText(RuleContext.java:135)
at org.antlr.v4.runtime.RuleContext.getText(RuleContext.java:137)
at org.antlr.v4.runtime.RuleContext.getText(RuleContext.java:137)
at firrtl.Visitor.visitExp(Visitor.scala:292)
at firrtl.Visitor.$anonfun$visitExp$1(Visitor.scala:333)
at firrtl.Visitor$$Lambda$109/283318938.apply(Unknown Source)
at scala.collection.TraversableLike.$anonfun$map$1(TraversableLike.scala:234)
at scala.collection.TraversableLike$$Lambda$70/1072601481.apply(Unknown Source)
at scala.collection.Iterator.foreach(Iterator.scala:929)
at scala.collection.Iterator.foreach$(Iterator.scala:929)
at scala.collection.AbstractIterator.foreach(Iterator.scala:1417)
at scala.collection.IterableLike.foreach(IterableLike.scala:71)
at scala.collection.IterableLike.foreach$(IterableLike.scala:70)
at scala.collection.AbstractIterable.foreach(Iterable.scala:54)
at scala.collection.TraversableLike.map(TraversableLike.scala:234)
at scala.collection.TraversableLike.map$(TraversableLike.scala:227)
at scala.collection.AbstractTraversable.map(Traversable.scala:104)
at firrtl.Visitor.visitExp(Visitor.scala:333)
at firrtl.Visitor.visitStmt(Visitor.scala:268)
at firrtl.Visitor.$anonfun$visitSuite$2(Visitor.scala:150)
at firrtl.Visitor$$Lambda$112/2134607032.apply(Unknown Source)
at scala.Option.map(Option.scala:146)
at firrtl.Visitor.$anonfun$visitSuite$1(Visitor.scala:150)
at firrtl.Visitor$$Lambda$111/2005169944.apply(Unknown Source)
at scala.collection.TraversableLike.$anonfun$flatMap$1(TraversableLike.scala:241)
at scala.collection.TraversableLike$$Lambda$84/1459794865.apply(Unknown Source)
at scala.collection.Iterator.foreach(Iterator.scala:929)
at scala.collection.Iterator.foreach$(Iterator.scala:929)
at scala.collection.AbstractIterator.foreach(Iterator.scala:1417)
at scala.collection.IterableLike.foreach(IterableLike.scala:71)
common.mk:57: recipe for target ‘/home/dt/f/freedom/builds/vc707-u500devkit/sifive.freedom.unleashed.DevKitU500FPGADesign_WithDevKit50MHz.v’ failed
make: *** [/home/dt/f/freedom/builds/vc707-u500devkit/sifive.freedom.unleashed.DevKitU500FPGADesign_WithDevKit50MHz.v] Error 1$