diff --git a/.gitignore b/.gitignore
index bc60707..82463a8 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,7 +1,3 @@
-prj/simulation/icarus/
-user/src/test.v
-user/sim/wave.vcd
-user/sim/testbench.v
 *.~vsdx
 *.pdf
 ~*.xlsx
@@ -9,4 +5,5 @@ user/sim/testbench.v
 ~*.dotx
 *.~vsd
 
-.vscode/
\ No newline at end of file
+.vscode/
+.metals/
\ No newline at end of file
diff --git a/chisel/.gitignore b/chisel/.gitignore
index 6683783..daec61a 100644
--- a/chisel/.gitignore
+++ b/chisel/.gitignore
@@ -13,6 +13,7 @@
 !build.sc
 !README.md
 !playground/doc/*
+!utils/*
 build/
 
 # mill
diff --git a/chisel/utils/firtool b/chisel/utils/firtool
new file mode 100644
index 0000000..1ece37d
--- /dev/null
+++ b/chisel/utils/firtool
@@ -0,0 +1,2 @@
+#!/usr/bin/env bash
+firtool.elf.strip --lowering-options=disallowLocalVariables,disallowPackedArrays,locationInfoStyle=wrapInAtSquareBracket $@
diff --git a/chisel/utils/firtool.elf.strip b/chisel/utils/firtool.elf.strip
new file mode 100644
index 0000000..749b297
Binary files /dev/null and b/chisel/utils/firtool.elf.strip differ