diff --git a/Makefile b/Makefile
index a77a374..38993dc 100644
--- a/Makefile
+++ b/Makefile
@@ -17,6 +17,7 @@ SIZE = $(CROSS_COMPILE)size
 SDK_SRC_BASE_PATH = sdk/src
 
 vpath %.c ./src
+vpath %.c $(SDK_SRC_BASE_PATH)/targets/hal/target_rtk/target_8195a
 vpath %.c $(SDK_SRC_BASE_PATH)/targets/cmsis/target_rtk/target_8195a
 vpath %.cc ./src
 
@@ -56,6 +57,10 @@ CPPFLAGS += -O2 $(INCLUDES) -D$(CHIP)
 
 ASFLAGS = -mcpu=cortex-m3 -mthumb -Wall -a -g $(INCLUDES)
 
+ifeq ($(SDRAM), true)
+else
+C_SRC+=$(wildcard $(SDK_SRC_BASE_PATH)/targets/hal/target_rtk/target_8195a/hal_sdr_controller.c)
+endif
 C_SRC+=$(wildcard $(SDK_SRC_BASE_PATH)/targets/cmsis/target_rtk/target_8195a/app_start.c)
 C_SRC+=$(wildcard src/*.c)
 CPP_SRC=$(wildcard src/*.cc)
@@ -74,7 +79,11 @@ ELF_FLAGS= -O2 -Wl,--gc-sections -mcpu=cortex-m3 -mthumb --specs=nano.specs
 ELF_FLAGS+= -Lsdk/lib -Lsdk/scripts -Tsdk/scripts/rlx8195a.ld -Wl,-Map=$(OUTPUT_PATH)/target.map 
 ELF_FLAGS+= -Wl,--cref -Wl,--gc-sections -Wl,--entry=Reset_Handler -Wl,--unresolved-symbols=report-all -Wl,--warn-common -Wl,--no-enum-size-warning
 
+ifeq ($(SDRAM), true)
+ELF_LDLIBS= sdk/lib/startup.o sdk/lib/hal_sdr_controller.o -l_platform -lstdc++ -lsupc++ -lm -lc -lgcc -lnosys
+else
 ELF_LDLIBS= sdk/lib/startup.o -l_platform -lstdc++ -lsupc++ -lm -lc -lgcc -lnosys
+endif
 
 all: makebin/ram_all.bin
 
diff --git a/README.md b/README.md
index edc116b..bb9511b 100644
--- a/README.md
+++ b/README.md
@@ -12,6 +12,15 @@ $ make
 ...
 genrate makebin/ram_all.bin
 ```
+
+* When use SDRAM (for RTL8195AM or RTL8711AM)
+
+```
+$ make SDRAM=true
+...
+genrate makebin/ram_all.bin
+```
+
 program ram_all.bin to ameba. ( [Programming the RTL8710 via DAP](https://github.com/eggman/RTL8710_DOC/blob/master/ProgrammingRTL8710.md) )
 
 
@@ -35,7 +44,7 @@ program ram_all.bin to ameba. ( [Programming the RTL8710 via DAP](https://github
 * ADC (RTL8195AM only)
 * DAC (RTL8195AM only)
 * SDRAM (RTL8195AM and RTL8711AM only)
-* I2S (HAL only)
+* I2S (only HAL support)
 
 ## not support
 * Wi-Fi
diff --git a/sdk/lib/hal_sdr_controller.o b/sdk/lib/hal_sdr_controller.o
new file mode 100644
index 0000000..98883ec
Binary files /dev/null and b/sdk/lib/hal_sdr_controller.o differ
diff --git a/sdk/lib/lib_platform.a b/sdk/lib/lib_platform.a
index d843b94..82a8e9b 100644
Binary files a/sdk/lib/lib_platform.a and b/sdk/lib/lib_platform.a differ
diff --git a/sdk/src/targets/hal/target_rtk/target_8195a/hal_sdr_controller.c b/sdk/src/targets/hal/target_rtk/target_8195a/hal_sdr_controller.c
new file mode 100644
index 0000000..73833ec
--- /dev/null
+++ b/sdk/src/targets/hal/target_rtk/target_8195a/hal_sdr_controller.c
@@ -0,0 +1,9 @@
+#include "rtl8195a.h"
+
+uint32_t SdrControllerInit(void) __attribute__((section(".hal.ram.text")));
+
+uint32_t SdrControllerInit(void)
+{
+    return FALSE;
+}
+