get icenet and testchipip unit tests working

generators/chipyard/src/main/scala/unittest/TestHarness.scala

@@ -0,0 +1,9 @@
+package chipyard.unittest
+
+import chisel3._
+import freechips.rocketchip.config.Parameters
+
+class TestHarness(implicit val p: Parameters) extends Module {
+  val io = IO(new Bundle { val success = Output(Bool()) })
+  io.success := Module(new UnitTestSuite).io.finished
+}

generators/chipyard/src/main/scala/unittest/UnitTestSuite.scala

@@ -0,0 +1,8 @@
+package chipyard.unittest
+
+import freechips.rocketchip.config.Parameters
+import freechips.rocketchip.util.{ElaborationArtefacts, PlusArgArtefacts}
+
+class UnitTestSuite(implicit p: Parameters) extends freechips.rocketchip.unittest.UnitTestSuite {
+  ElaborationArtefacts.add("plusArgs", PlusArgArtefacts.serialize_cHeader)
+}

sims/vcs/Makefile

@@ -56,7 +56,7 @@ VCS_CC_OPTS = \
 VCS_NONCC_OPTS = \
 	+lint=all,noVCDE,noONGS,noUI \
 	-error=PCWM-L \
-	-timescale=1ns/10ps \
+	-timescale=1ns/1ps \
 	-quiet \
 	-q \
 	+rad \

variables.mk

@@ -50,6 +50,30 @@ ifeq ($(SUB_PROJECT),hwacha)
 	TB                ?= TestDriver
 	TOP               ?= ExampleRocketSystem
 endif
+# For TestChipIP developers
+ifeq ($(SUB_PROJECT),testchipip)
+	SBT_PROJECT       ?= chipyard
+	MODEL             ?= TestHarness
+	VLOG_MODEL        ?= TestHarness
+	MODEL_PACKAGE     ?= chipyard.unittest
+	CONFIG            ?= TestChipUnitTestConfig
+	CONFIG_PACKAGE    ?= testchipip
+	GENERATOR_PACKAGE ?= chipyard
+	TB                ?= TestDriver
+	TOP               ?= UnitTestSuite
+endif
+# For IceNet developers
+ifeq ($(SUB_PROJECT),icenet)
+	SBT_PROJECT       ?= chipyard
+	MODEL             ?= TestHarness
+	VLOG_MODEL        ?= TestHarness
+	MODEL_PACKAGE     ?= chipyard.unittest
+	CONFIG            ?= IceNetUnitTestConfig
+	CONFIG_PACKAGE    ?= icenet
+	GENERATOR_PACKAGE ?= chipyard
+	TB                ?= TestDriver
+	TOP               ?= UnitTestSuite
+endif
 
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 # path to rocket-chip and testchipip