diff --git a/tensorflow/lite/micro/cortex_m_corstone_300/README.md b/tensorflow/lite/micro/cortex_m_corstone_300/README.md
index d7b9e77d2ac..f5ad46929b3 100644
--- a/tensorflow/lite/micro/cortex_m_corstone_300/README.md
+++ b/tensorflow/lite/micro/cortex_m_corstone_300/README.md
@@ -1,24 +1,25 @@
+ <!-- mdformat off(b/169948621#comment2) -->
 
 # Running a fixed virtual platform based on Corstone-300 software
 
-This target makes use of a fixed virtual platform (FVP) based on Arm Cortex-300 based software.
-More info about Arm Corstone-300 software: https://developer.arm.com/ip-products/subsystem/corstone/corstone-300
-More info about FVPs: https://developer.arm.com/tools-and-software/simulation-models/fixed-virtual-platforms
+This target makes use of a fixed virtual platform (FVP) based on Arm Cortex-300 based software. More info about Arm Corstone-300 software: https://developer.arm.com/ip-products/subsystem/corstone/corstone-300. More info about FVPs: https://developer.arm.com/tools-and-software/simulation-models/fixed-virtual-platforms.
 
 To fullfill the needed requirements it is depending the following projects:
-* Arm Ethos-U Core Platform: https://review.mlplatform.org/admin/repos/ml/ethos-u/ethos-u-core-platform
-* CMSIS: https://github.com/ARM-software/CMSIS_5
+
+ - Arm Ethos-U Core Platform: https://review.mlplatform.org/admin/repos/ml/ethos-u/ethos-u-core-platform.
+    - Arm Ethos-U Core Platform provides the linker file as well as UART and retarget functions.
+ - CMSIS: https://github.com/ARM-software/CMSIS_5.
+    - CMSIS provides startup functionality, e.g. for setting up interrupt handlers and clock speed.
 
 # General build info
 
-This target is based on the cortex_m_generic target and except that for now the only supported toolchain is GCC, the same general build info applies: tensorflow/lite/micro/cortex_m_generic/README.md
+This target is based on the cortex_m_generic target and except that for now the only supported toolchain is GCC, the same general build info applies: tensorflow/lite/micro/cortex_m_generic/README.md.
 
 Required parameters:
 
   - TARGET: cortex_m_corstone_300
   - TARGET_ARCH: cortex-mXX (For all options see: tensorflow/lite/micro/tools/make/targets/cortex_m_corstone_300_makefile.inc)
 
-
 # How to run
 
 Note that Corstone-300 is targetted for Cortex-M55 but it is backwards compatible. This means one could potentially run it for example with a Cortex-M7.
diff --git a/tensorflow/lite/micro/cortex_m_corstone_300/system_setup.cc b/tensorflow/lite/micro/cortex_m_corstone_300/system_setup.cc
new file mode 100644
index 00000000000..cc8cbebad29
--- /dev/null
+++ b/tensorflow/lite/micro/cortex_m_corstone_300/system_setup.cc
@@ -0,0 +1,26 @@
+/* Copyright 2021 The TensorFlow Authors. All Rights Reserved.
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+==============================================================================*/
+
+#include "tensorflow/lite/micro/system_setup.h"
+
+namespace system_setup {
+
+extern "C" {
+void uart_init(void);
+}
+
+void Initialize() {uart_init();}
+
+}; // namespace system_setup
diff --git a/tensorflow/lite/micro/system_setup.cc b/tensorflow/lite/micro/system_setup.cc
new file mode 100644
index 00000000000..2aeac627d97
--- /dev/null
+++ b/tensorflow/lite/micro/system_setup.cc
@@ -0,0 +1,26 @@
+/* Copyright 2021 The TensorFlow Authors. All Rights Reserved.
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+==============================================================================*/
+
+#include "tensorflow/lite/micro/system_setup.h"
+
+namespace system_setup {
+
+// To add an equivalent function for your own platform, create your own
+// implementation file, and place it in a subfolder named after the OS
+// you're targeting. See tensorflow/lite/micro/debug_log.cc for a similar
+// example.
+void Initialize() {}
+
+} // namespace system_setup
diff --git a/tensorflow/lite/micro/system_setup.h b/tensorflow/lite/micro/system_setup.h
new file mode 100644
index 00000000000..a408d3f4d63
--- /dev/null
+++ b/tensorflow/lite/micro/system_setup.h
@@ -0,0 +1,31 @@
+/* Copyright 2021 The TensorFlow Authors. All Rights Reserved.
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+==============================================================================*/
+
+// This is part of the ultra-lightweight testing framework designed for use with
+// microcontroller applications. See tensorflow/lite/micro/testing/micro_test.h.
+
+#ifndef TENSORFLOW_LITE_MICRO_TESTING_SYSTEM_SETUP_H_
+#define TENSORFLOW_LITE_MICRO_TESTING_SYSTEM_SETUP_H_
+
+namespace system_setup {
+
+// This is called during initialization of testing framework. It can be
+// implemented by each target platform. For more information, see
+// tensorflow/lite/micro/system_setup.cc.
+void Initialize();
+
+} // namespace system_setup
+
+#endif  // TENSORFLOW_LITE_MICRO_TESTING_SYSTEM_SETUP_H_
diff --git a/tensorflow/lite/micro/testing/micro_test.h b/tensorflow/lite/micro/testing/micro_test.h
index eaf3181bcd7..ad399169780 100644
--- a/tensorflow/lite/micro/testing/micro_test.h
+++ b/tensorflow/lite/micro/testing/micro_test.h
@@ -56,6 +56,7 @@ limitations under the License.
 
 #include "tensorflow/lite/c/common.h"
 #include "tensorflow/lite/micro/micro_error_reporter.h"
+#include "tensorflow/lite/micro/system_setup.h"
 
 namespace micro_test {
 extern int tests_passed;
@@ -63,21 +64,8 @@ extern int tests_failed;
 extern bool is_test_complete;
 extern bool did_test_fail;
 extern tflite::ErrorReporter* reporter;
-
-#if defined(CORTEX_M_CORSTONE_300)
-extern "C" {
-void uart_init(void);
-}
-#endif
-
 }  // namespace micro_test
 
-#if defined(CORTEX_M_CORSTONE_300)
-#define TF_LITE_MICRO_INIT_UART_FOR_CORSTONE_300 micro_test::uart_init();
-#else
-#define TF_LITE_MICRO_INIT_UART_FOR_CORSTONE_300
-#endif
-
 #define TF_LITE_MICRO_TESTS_BEGIN              \
   namespace micro_test {                       \
   int tests_passed;                            \
@@ -92,7 +80,7 @@ void uart_init(void);
     micro_test::tests_failed = 0;              \
     tflite::MicroErrorReporter error_reporter; \
     micro_test::reporter = &error_reporter;    \
-    TF_LITE_MICRO_INIT_UART_FOR_CORSTONE_300
+    system_setup::Initialize();
 
 #define TF_LITE_MICRO_TESTS_END                                \
   micro_test::reporter->Report(                                \
diff --git a/tensorflow/lite/micro/testing/test_with_arm_corstone_300.sh b/tensorflow/lite/micro/testing/test_with_arm_corstone_300.sh
index 3fba0c3f615..c5293e56b83 100755
--- a/tensorflow/lite/micro/testing/test_with_arm_corstone_300.sh
+++ b/tensorflow/lite/micro/testing/test_with_arm_corstone_300.sh
@@ -31,7 +31,7 @@ MICRO_LOG_FILENAME=${RESULTS_DIRECTORY}/logs.txt
 mkdir -p ${RESULTS_DIRECTORY}
 
 FVP="FVP_Corstone_SSE-300_Ethos-U55 "
-FVP+="--cpulimit 2 "
+FVP+="--cpulimit 1 "
 FVP+="-C mps3_board.visualisation.disable-visualisation=1 "
 FVP+="-C mps3_board.telnetterminal0.start_telnet=0 "
 FVP+='-C mps3_board.uart0.out_file="-" '
diff --git a/tensorflow/lite/micro/tools/ci_build/test_all.sh b/tensorflow/lite/micro/tools/ci_build/test_all.sh
index 967a9dd9660..eee224282c1 100755
--- a/tensorflow/lite/micro/tools/ci_build/test_all.sh
+++ b/tensorflow/lite/micro/tools/ci_build/test_all.sh
@@ -80,7 +80,4 @@ tensorflow/lite/micro/tools/ci_build/test_arduino.sh
 echo "Running cortex_m_generic tests at `date`"
 tensorflow/lite/micro/tools/ci_build/test_cortex_m_generic.sh
 
-echo "Running cortex_m_corstone_300 tests at `date`"
-tensorflow/lite/micro/tools/ci_build/test_cortex_m_corstone_300.sh
-
 echo "Finished all micro tests at `date`"
diff --git a/tensorflow/lite/micro/tools/make/ethos_u_core_platform_download.sh b/tensorflow/lite/micro/tools/make/ethos_u_core_platform_download.sh
index f15c9d81cef..d00800af28a 100755
--- a/tensorflow/lite/micro/tools/make/ethos_u_core_platform_download.sh
+++ b/tensorflow/lite/micro/tools/make/ethos_u_core_platform_download.sh
@@ -63,6 +63,18 @@ else
 
   mkdir ${DOWNLOADED_ETHOS_U_CORE_PLATFORM_PATH}
   tar xzf ${TEMPFILE} --strip-components=1 -C ${DOWNLOADED_ETHOS_U_CORE_PLATFORM_PATH} >&2
+
+  # Run C preprocessor on linker file to get rid of ifdefs and make sure compiler is downloaded first.
+  COMPILER=${DOWNLOADS_DIR}/gcc_embedded/bin/arm-none-eabi-gcc
+  if [ ! -f ${COMPILER} ]; then
+      RETURN_VALUE=`./tensorflow/lite/micro/tools/make/arm_gcc_download.sh ${DOWNLOADS_DIR}`
+      if [ "SUCCESS" != "${RETURN_VALUE}" ]; then
+        echo "The script ./tensorflow/lite/micro/tools/make/arm_gcc_download.sh failed."
+        exit 1
+      fi
+  fi
+  LINKER_PATH=${DOWNLOADED_ETHOS_U_CORE_PLATFORM_PATH}/targets/corstone-300
+  ${COMPILER} -E -x c -P -o ${LINKER_PATH}/platform_parsed.ld ${LINKER_PATH}/platform.ld
 fi
 
 echo "SUCCESS"
diff --git a/tensorflow/lite/micro/tools/make/targets/cortex_m_corstone_300_makefile.inc b/tensorflow/lite/micro/tools/make/targets/cortex_m_corstone_300_makefile.inc
index 7d1a8eccc88..48dcd1719bb 100644
--- a/tensorflow/lite/micro/tools/make/targets/cortex_m_corstone_300_makefile.inc
+++ b/tensorflow/lite/micro/tools/make/targets/cortex_m_corstone_300_makefile.inc
@@ -93,15 +93,6 @@ ifeq ($(TOOLCHAIN), gcc)
   CXXFLAGS += $(FLAGS_GCC)
   CCFLAGS += $(FLAGS_GCC)
 
-  # Run C preprocessor on linker file to get rid of ifdefs.
-  ifeq (,$(wildcard $(ETHOS_U_CORE_PLATFORM)/platform_parsed.ld))
-    RESULT := $(shell arm-none-eabi-gcc -E -x c -P -o $(ETHOS_U_CORE_PLATFORM)/platform_parsed.ld \
-      $(ETHOS_U_CORE_PLATFORM)/platform.ld)
-    ifneq ($(RESULT),)
-      $(error Something went wrong when parsing linker file: $(RESULT))
-    endif
-  endif
-
   LDFLAGS += \
     --specs=nosys.specs \
     -T $(ETHOS_U_CORE_PLATFORM)/platform_parsed.ld \
@@ -141,9 +132,9 @@ CCFLAGS += -D$(ARM_CPU)$(CMSIS_ARM_FEATURES)
 THIRD_PARTY_CC_SRCS += \
   $(wildcard $(ETHOS_U_CORE_PLATFORM)/*.c)
 
-EXCLUDED_SRCS := \
-  $(ETHOS_U_CORE_PLATFORM)/main.c
-THIRD_PARTY_CC_SRCS := $(filter-out $(EXCLUDED_SRCS), $(THIRD_PARTY_CC_SRCS))
+THIRD_PARTY_CC_SRCS += \
+  $(ETHOS_U_CORE_PLATFORM)/retarget.c \
+  $(ETHOS_U_CORE_PLATFORM)/uart.c
 
 CMSIS_DEFAULT_DOWNLOAD_PATH := $(MAKEFILE_DIR)/downloads/cmsis
 CMSIS_PATH := $(CMSIS_DEFAULT_DOWNLOAD_PATH)