diff --git a/.gitmodules b/.gitmodules
index c1aa3f9..73a180d 100644
--- a/.gitmodules
+++ b/.gitmodules
@@ -4,3 +4,6 @@
 [submodule "lasoft/la32r-nemu"]
 	path = lasoft/la32r-nemu
 	url = https://gitee.com/wwt_panache/la32r-nemu
+[submodule "lasoft/la32r-Linux"]
+	path = lasoft/la32r-Linux
+	url = https://gitee.com/loongson-edu/la32r-Linux
diff --git a/Makefile b/Makefile
index 8ab6ab8..d8d11f3 100644
--- a/Makefile
+++ b/Makefile
@@ -13,8 +13,10 @@ LA_GDB_URL		:= https://gitee.com/loongson-edu/la32r-toolchains/releases/download
 TOOLCHAIN_TAR	:= $(notdir $(TOOLCHAIN_URL))
 LA_GDB_TAR		:= $(notdir $(LA_GDB_URL))
 
-ext/$(TOOLCHAIN_TAR):
+$(TOOLCHAIN_TAR):
 	wget $(TOOLCHAIN_URL)
+
+ext/$(TOOLCHAIN_TAR):
 	tar -zxvf $(notdir $@)
 	mv loongarch32r-linux-gnusf-* ext
 
@@ -22,6 +24,34 @@ lagcc: ext/$(TOOLCHAIN_TAR)
 
 LA_ARCH			:= loongarch32r-linux-gnusf-
 
+# prepare busybox
+
+BUSYBOX_URL		:= https://gitee.com/loongson-edu/la32r-Linux/releases/download/v0.2/initrd_d.tar.gz
+BUSYBOX_TAR		:= $(notdir $(BUSYBOX_URL))
+
+$(BUSYBOX_TAR):
+	wget $(BUSYBOX_URL)
+
+ext/$(BUSYBOX_TAR): $(BUSYBOX_TAR)
+	tar -xvf $(notdir $@)
+	mv initrd_d* ext
+
+busybox: ext/$(BUSYBOX_TAR)
+
+# prepare loongarch linux source code
+
+LALX_URL		:= https://gitee.com/loongson-edu/la32r-Linux
+LALX_TAR		:= $(notdir $(LALX_URL))
+
+$(LALX_TAR):
+	wget $(LALX_URL)
+
+ext/$(LALX_TAR): $(LALX_TAR)
+	tar -xvf $(notdir $@)
+	mv v0.2* ext
+
+lalx: ext/$(LALX_TAR)
+
 # prepare loongarch source code
 
 xv6: lagcc
diff --git a/lasoft/la32r-Linux b/lasoft/la32r-Linux
new file mode 160000
index 0000000..bb6b2ca
--- /dev/null
+++ b/lasoft/la32r-Linux
@@ -0,0 +1 @@
+Subproject commit bb6b2ca56ade552181363f5b8be3c42397a223c0