diff --git a/.gitignore b/.gitignore
index 47cb4d87..35d9b2d8 100644
--- a/.gitignore
+++ b/.gitignore
@@ -18,3 +18,4 @@ tags
 *~
 env-riscv-tools.sh
 env-esp-tools.sh
+.bloop/
diff --git a/common.mk b/common.mk
index 5b502cb1..ee888b3b 100644
--- a/common.mk
+++ b/common.mk
@@ -34,13 +34,8 @@ lookup_srcs = $(shell find -L $(1)/ -name target -prune -o -iname "*.$(2)" -prin
 SOURCE_DIRS = $(addprefix $(base_dir)/,generators sims/firesim/sim tools/barstools/iocell)
 SCALA_SOURCES = $(call lookup_srcs,$(SOURCE_DIRS),scala)
 VLOG_SOURCES = $(call lookup_srcs,$(SOURCE_DIRS),sv) $(call lookup_srcs,$(SOURCE_DIRS),v)
-
-#########################################################################################
-# rocket and testchipip classes
-#########################################################################################
-# NB: target/ lives under source ----V , due to how we're handling midas dependency injection
-ROCKET_CLASSES ?= "$(ROCKETCHIP_DIR)/src/target/scala-$(SCALA_VERSION_MAJOR)/classes:$(ROCKETCHIP_DIR)/chisel3/target/scala-$(SCALA_VERSION_MAJOR)/*"
-TESTCHIPIP_CLASSES ?= "$(TESTCHIP_DIR)/target/scala-$(SCALA_VERSION_MAJOR)/classes"
+# This assumes no SBT meta-build sources
+SBT_SOURCES = $(call lookup_srcs,$(base_dir),sbt)
 
 #########################################################################################
 # jar creation variables and rules
@@ -60,11 +55,19 @@ $(FIRRTL_TEST_JAR): $(call lookup_srcs,$(CHIPYARD_FIRRTL_DIR),scala)
 	cp -p $(CHIPYARD_FIRRTL_DIR)/utils/bin/firrtl-test.jar $@
 	touch $@
 
+
+#########################################################################################
+# Bloop Project Definitions
+#########################################################################################
+$(BLOOP_CONFIG_DIR)/TIMESTAMP: $(SBT_SOURCES)
+	cd $(base_dir) && $(SBT) "project chipyardRoot" "bloopInstall"
+	touch $@
+
 #########################################################################################
 # create list of simulation file inputs
 #########################################################################################
-$(sim_files): $(call lookup_srcs,$(base_dir)/generators/utilities/src/main/scala,scala) $(FIRRTL_JAR)
-	cd $(base_dir) && $(SBT) "project utilities" "runMain utilities.GenerateSimFiles -td $(build_dir) -sim $(sim_name)"
+$(sim_files): $(call lookup_srcs,$(base_dir)/generators/utilities/src/main/scala,scala) $(FIRRTL_JAR) $(SCALA_BUILDTOOL_DEPS)
+	$(call run_scala_main,utilities,utilities.GenerateSimFiles,-td $(build_dir) -sim $(sim_name))
 
 #########################################################################################
 # create firrtl file rule and variables
@@ -76,11 +79,11 @@ $(FIRRTL_FILE) $(ANNO_FILE): generator_temp
 # AG: must re-elaborate if ariane sources have changed... otherwise just run firrtl compile
 generator_temp: $(SCALA_SOURCES) $(sim_files) $(EXTRA_GENERATOR_REQS)
 	mkdir -p $(build_dir)
-	cd $(base_dir) && $(SBT) "project $(SBT_PROJECT)" "runMain $(GENERATOR_PACKAGE).Generator \
+	$(call run_scala_main,$(SBT_PROJECT),$(GENERATOR_PACKAGE).Generator,\
 		--target-dir $(build_dir) \
 		--name $(long_name) \
 		--top-module $(MODEL_PACKAGE).$(MODEL) \
-		--legacy-configs $(CONFIG_PACKAGE).$(CONFIG)"
+		--legacy-configs $(CONFIG_PACKAGE).$(CONFIG))
 
 .PHONY: firrtl
 firrtl: $(FIRRTL_FILE)
@@ -101,7 +104,7 @@ $(TOP_TARGETS) $(HARNESS_TARGETS): firrtl_temp
 	@echo "" > /dev/null
 
 firrtl_temp: $(FIRRTL_FILE) $(ANNO_FILE) $(VLOG_SOURCES)
-	cd $(base_dir) && $(SBT) "project tapeout" "runMain barstools.tapeout.transforms.GenerateTopAndHarness -o $(TOP_FILE) -tho $(HARNESS_FILE) -i $(FIRRTL_FILE) --syn-top $(TOP) --harness-top $(VLOG_MODEL) -faf $(ANNO_FILE) -tsaof $(TOP_ANNO) -tdf $(sim_top_blackboxes) -tsf $(TOP_FIR) -thaof $(HARNESS_ANNO) -hdf $(sim_harness_blackboxes) -thf $(HARNESS_FIR) $(REPL_SEQ_MEM) $(HARNESS_CONF_FLAGS) -td $(build_dir)" && touch $(sim_top_blackboxes) $(sim_harness_blackboxes)
+	$(call run_scala_main,tapeout,barstools.tapeout.transforms.GenerateTopAndHarness,-o $(TOP_FILE) -tho $(HARNESS_FILE) -i $(FIRRTL_FILE) --syn-top $(TOP) --harness-top $(VLOG_MODEL) -faf $(ANNO_FILE) -tsaof $(TOP_ANNO) -tdf $(sim_top_blackboxes) -tsf $(TOP_FIR) -thaof $(HARNESS_ANNO) -hdf $(sim_harness_blackboxes) -thf $(HARNESS_FIR) $(REPL_SEQ_MEM) $(HARNESS_CONF_FLAGS) -td $(build_dir)) && touch $(sim_top_blackboxes) $(sim_harness_blackboxes)
 # DOC include end: FirrtlCompiler
 
 # This file is for simulation only. VLSI flows should replace this file with one containing hard SRAMs
@@ -111,7 +114,7 @@ $(TOP_SMEMS_FILE) $(TOP_SMEMS_FIR): top_macro_temp
 	@echo "" > /dev/null
 
 top_macro_temp: $(TOP_SMEMS_CONF)
-	cd $(base_dir) && $(SBT) "project barstoolsMacros" "runMain barstools.macros.MacroCompiler -n $(TOP_SMEMS_CONF) -v $(TOP_SMEMS_FILE) -f $(TOP_SMEMS_FIR) $(MACROCOMPILER_MODE)"
+	$(call run_scala_main,barstoolsMacros,barstools.macros.MacroCompiler,-n $(TOP_SMEMS_CONF) -v $(TOP_SMEMS_FILE) -f $(TOP_SMEMS_FIR) $(MACROCOMPILER_MODE))
 
 HARNESS_MACROCOMPILER_MODE = --mode synflops
 .INTERMEDIATE: harness_macro_temp
@@ -119,7 +122,7 @@ $(HARNESS_SMEMS_FILE) $(HARNESS_SMEMS_FIR): harness_macro_temp
 	@echo "" > /dev/null
 
 harness_macro_temp: $(HARNESS_SMEMS_CONF) | top_macro_temp
-	cd $(base_dir) && $(SBT) "project barstoolsMacros" "runMain barstools.macros.MacroCompiler -n $(HARNESS_SMEMS_CONF) -v $(HARNESS_SMEMS_FILE) -f $(HARNESS_SMEMS_FIR) $(HARNESS_MACROCOMPILER_MODE)"
+	$(call run_scala_main,barstoolsMacros,barstools.macros.MacroCompiler, -n $(HARNESS_SMEMS_CONF) -v $(HARNESS_SMEMS_FILE) -f $(HARNESS_SMEMS_FIR) $(HARNESS_MACROCOMPILER_MODE))
 
 ########################################################################################
 # remove duplicate files and headers in list of simulation file inputs
diff --git a/project/plugins.sbt b/project/plugins.sbt
index 8de71081..3fe776fa 100644
--- a/project/plugins.sbt
+++ b/project/plugins.sbt
@@ -15,5 +15,6 @@ addSbtPlugin("com.simplytyped" % "sbt-antlr4" % "0.8.1")
 addSbtPlugin("com.github.gseitz" % "sbt-protobuf" % "0.6.3")
 addSbtPlugin("ch.epfl.scala" % "sbt-scalafix" % "0.9.4")
 addSbtPlugin("com.typesafe" % "sbt-mima-plugin" % "0.6.1")
+addSbtPlugin("ch.epfl.scala" % "sbt-bloop" % "1.4.1")
 
 libraryDependencies += "com.github.os72" % "protoc-jar" % "3.5.1.1"
diff --git a/scripts/firesim-setup.sh b/scripts/firesim-setup.sh
index bb14f39e..a110cb61 100755
--- a/scripts/firesim-setup.sh
+++ b/scripts/firesim-setup.sh
@@ -12,7 +12,6 @@ cd "${scripts_dir}/.."
 
 # Reenable the FireSim submodule
 git config --unset submodule.sims/firesim.update || true
-git submodule update --init sims/firesim
 cd sims/firesim
 ./build-setup.sh "$@" --library
 cd "$RDIR"
diff --git a/sims/firesim b/sims/firesim
index 82ce80bc..8064d880 160000
--- a/sims/firesim
+++ b/sims/firesim
@@ -1 +1 @@
-Subproject commit 82ce80bc129905834426629279098fcd970a9ed3
+Subproject commit 8064d8808b9c936711361532a95affbfc2fcbdca
diff --git a/variables.mk b/variables.mk
index 1a3623a2..48da498e 100644
--- a/variables.mk
+++ b/variables.mk
@@ -125,9 +125,33 @@ JAVA_ARGS ?= -Xmx$(JAVA_HEAP_SIZE) -Xss8M -XX:MaxPermSize=256M
 #########################################################################################
 SCALA_VERSION=2.12.10
 SCALA_VERSION_MAJOR=$(basename $(SCALA_VERSION))
-
 SBT ?= java $(JAVA_ARGS) -jar $(ROCKETCHIP_DIR)/sbt-launch.jar
 
+BLOOP ?= bloop
+BLOOP_CONFIG_DIR ?= $(base_dir)/.bloop
+# This mirrors the bloop default. Set to a system-unique port in a multi-user environment
+BLOOP_NAILGUN_PORT ?= 8212
+
+SCALA_BUILDTOOL_DEPS = $(SBT_SOURCES)
+
+ifdef ENABLE_BLOOP
+override SCALA_BUILDTOOL_DEPS += $(BLOOP_CONFIG_DIR)/TIMESTAMP
+# Two notes about the bloop invocation:
+# 1) the sed removes a leading {file:<path>} that sometimes needs to be
+#    provided to SBT when a project but not for bloop.
+# 2) Generally, one could could pass '--' to indicate all remaining arguments are
+# 	 destined for the scala Main, however a bug in Bloop's argument parsing causes the
+#    --nailgun-port argument to be lost in this case. Workaround this by prefixing
+#    every main-destined argument with "--args"
+define run_scala_main
+	cd $(base_dir) && bloop --nailgun-port $(BLOOP_NAILGUN_PORT) run $(shell echo $(1) | sed 's/{.*}//') --main $(2)  $(addprefix --args ,$3)
+endef
+else
+define run_scala_main
+	cd $(base_dir) && $(SBT) "project $(1)" "runMain $(2) $(3)"
+endef
+endif
+
 #########################################################################################
 # output directory for tests
 #########################################################################################