diff --git a/hello_world/Makefile b/hello_world/Makefile
index 9051e7d..4c7d3ac 100644
--- a/hello_world/Makefile
+++ b/hello_world/Makefile
@@ -15,6 +15,9 @@ LDFLAGS = -T powerpc.lds
 
 all: hello_world.hex
 
+console.o: ../lib/console.c
+	$(CC) $(CPPFLAGS) $(CFLAGS) -c $< -o $@
+
 hello_world.elf: hello_world.o head.o console.o
 	$(LD) $(LDFLAGS) -o $@ $^
 
diff --git a/hello_world/console.h b/include/console.h
similarity index 81%
rename from hello_world/console.h
rename to include/console.h
index 5cf303a..a16db9a 100644
--- a/hello_world/console.h
+++ b/include/console.h
@@ -4,6 +4,7 @@ void potato_uart_init(void);
 void potato_uart_irq_en(void);
 void potato_uart_irq_dis(void);
 int getchar(void);
-void putchar(unsigned char c);
+int putchar(int c);
 void putstr(const char *str, unsigned long len);
+int puts(const char *str);
 size_t strlen(const char *s);
diff --git a/hello_world/console.c b/lib/console.c
similarity index 100%
rename from hello_world/console.c
rename to lib/console.c
diff --git a/litedram/gen-src/sdram_init/Makefile b/litedram/gen-src/sdram_init/Makefile
index 28395a3..367b89d 100644
--- a/litedram/gen-src/sdram_init/Makefile
+++ b/litedram/gen-src/sdram_init/Makefile
@@ -4,7 +4,7 @@ include variables.mak
 OBJ = $(BUILD_DIR)/obj
 
 PROGRAM = sdram_init
-OBJECTS = $(OBJ)/head.o $(OBJ)/main.o $(OBJ)/sdram.o
+OBJECTS = $(OBJ)/head.o $(OBJ)/main.o $(OBJ)/sdram.o $(OBJ)/console.o
 
 #### Compiler
 
@@ -50,10 +50,12 @@ all: objdir $(OBJ)/$(PROGRAM).hex
 
 $(OBJ)/sdram.o: $(LXSRC_DIR)/sdram.c
 	$(call Q,CC, $(CC) $(CPPFLAGS) $(CFLAGS) -c $< -o $@, $@)
-$(OBJ)/%.o : $(SRC_DIR)/%.S
-	$(call Q,AS, $(CC) $(ASFLAGS) -c $< -o $@, $@)
+$(OBJ)/console.o: $(SRC_DIR)/../../../lib/console.c
+	$(call Q,CC, $(CC) $(CPPFLAGS) $(CFLAGS) -c $< -o $@, $@)
 $(OBJ)/%.o : $(SRC_DIR)/%.c
 	$(call Q,CC, $(CC) $(CPPFLAGS) $(CFLAGS) -c $< -o $@, $@)
+$(OBJ)/%.o : $(SRC_DIR)/%.S
+	$(call Q,AS, $(CC) $(ASFLAGS) -c $< -o $@, $@)
 $(OBJ)/%.o : $(SRC_DIR)/libc/src/%.c
 	$(call Q,CC, $(CC) $(CPPFLAGS) $(CFLAGS) -c $< -o $@, $@)
 
diff --git a/rust_lib_demo/console.c b/rust_lib_demo/console.c
index 112b085..1c80e34 120000
--- a/rust_lib_demo/console.c
+++ b/rust_lib_demo/console.c
@@ -1 +1 @@
-../hello_world/console.c
\ No newline at end of file
+../lib/console.c
\ No newline at end of file
diff --git a/rust_lib_demo/console.h b/rust_lib_demo/console.h
index fbe66d5..7a6f2c3 120000
--- a/rust_lib_demo/console.h
+++ b/rust_lib_demo/console.h
@@ -1 +1 @@
-../hello_world/console.h
\ No newline at end of file
+../include/console.h
\ No newline at end of file
diff --git a/tests/Makefile.test b/tests/Makefile.test
index 9241e3f..3b800d0 100644
--- a/tests/Makefile.test
+++ b/tests/Makefile.test
@@ -9,14 +9,17 @@ CC = $(CROSS_COMPILE)gcc
 LD = $(CROSS_COMPILE)ld
 OBJCOPY = $(CROSS_COMPILE)objcopy
 
-CFLAGS = -Os -g -Wall -std=c99 -msoft-float -mno-string -mno-multiple -mno-vsx -mno-altivec -mlittle-endian -fno-stack-protector -mstrict-align -ffreestanding -fdata-sections -ffunction-sections -I ../../hello_world -I ../../include
+CFLAGS = -Os -g -Wall -std=c99 -msoft-float -mno-string -mno-multiple -mno-vsx -mno-altivec -mlittle-endian -fno-stack-protector -mstrict-align -ffreestanding -fdata-sections -ffunction-sections -I ../../include
 ASFLAGS = $(CFLAGS)
 LDFLAGS = -T powerpc.lds
 
 all: $(TEST).hex
 
-$(TEST).elf: $(TEST).o head.o ../../hello_world/console.o
-	$(LD) $(LDFLAGS) -o $(TEST).elf $(TEST).o head.o ../../hello_world/console.o
+console.o: ../../lib/console.c
+	$(CC) $(CPPFLAGS) $(CFLAGS) -c $< -o $@
+
+$(TEST).elf: $(TEST).o head.o console.o
+	$(LD) $(LDFLAGS) -o $(TEST).elf $(TEST).o head.o console.o
 
 $(TEST).bin: $(TEST).elf
 	$(OBJCOPY) -O binary $(TEST).elf $(TEST).bin