diff --git a/.gitignore b/.gitignore
index 1f1aa83..4ed3ed8 100644
--- a/.gitignore
+++ b/.gitignore
@@ -10,3 +10,4 @@
 !init.sh
 /fceux-am
 /nvboard
+/am-kernels
diff --git a/abstract-machine/Makefile b/abstract-machine/Makefile
index 3a5d60a..291a3d5 100644
--- a/abstract-machine/Makefile
+++ b/abstract-machine/Makefile
@@ -66,8 +66,8 @@ LINKAGE   = $(OBJS) \
 ## 3. General Compilation Flags
 
 ### (Cross) compilers, e.g., mips-linux-gnu-g++
-AS        = $(CROSS_COMPILE)gcc
-CC        = $(CROSS_COMPILE)gcc
+AS        = $(CROSS_COMPILE)cc
+CC        = $(CROSS_COMPILE)cc
 CXX       = $(CROSS_COMPILE)g++
 LD        = $(CROSS_COMPILE)ld
 AR        = $(CROSS_COMPILE)ar
diff --git a/nemu/.gitignore b/nemu/.gitignore
index 77fe490..36e223b 100644
--- a/nemu/.gitignore
+++ b/nemu/.gitignore
@@ -7,6 +7,8 @@ build/
 .config
 .config.old
 .envrc
+.metals/
+.vscode/
 compile_commands.json
 
 ### C ###
diff --git a/nemu/.metals/metals.log b/nemu/.metals/metals.log
deleted file mode 100644
index 6c3b991..0000000
--- a/nemu/.metals/metals.log
+++ /dev/null
@@ -1,3 +0,0 @@
-2024.02.03 20:20:12 INFO  Started: Metals version 1.2.0+12-644090c2-SNAPSHOT in folders '/home/xin/repo/ysyx-workbench/nemu' for client Visual Studio Code 1.85.2.
-2024.02.03 20:20:13 WARN  Build server is not auto-connectable.
-2024.02.03 20:20:13 WARN  no build tool detected in workspace '/home/xin/repo/ysyx-workbench/nemu'. The most common cause for this problem is that the editor was opened in the wrong working directory, for example if you use sbt then the workspace directory should contain build.sbt. 
diff --git a/nemu/.metals/metals.mv.db b/nemu/.metals/metals.mv.db
deleted file mode 100644
index 634be79..0000000
Binary files a/nemu/.metals/metals.mv.db and /dev/null differ
diff --git a/nemu/.vscode/property.json b/nemu/.vscode/property.json
deleted file mode 100644
index 7dc2beb..0000000
--- a/nemu/.vscode/property.json
+++ /dev/null
@@ -1,11 +0,0 @@
-{
-	"toolChain": "xilinx",
-	"prjName": {
-		"PL": "template"
-	},
-	"soc": {
-		"core": "none"
-	},
-	"enableShowLog": false,
-	"device": "none"
-}
\ No newline at end of file
diff --git a/nemu/.vscode/settings.json b/nemu/.vscode/settings.json
deleted file mode 100644
index c9da297..0000000
--- a/nemu/.vscode/settings.json
+++ /dev/null
@@ -1,6 +0,0 @@
-{
-    "digital-ide.welcome.show": false,
-    "files.watcherExclude": {
-        "**/target": true
-    }
-}
\ No newline at end of file
diff --git a/nemu/src/monitor/sdb/.gitignore b/nemu/src/monitor/sdb/.gitignore
deleted file mode 100644
index e69de29..0000000