risc-v/src/fe310: CMake build implemented for SiFive FE310

- added  SiFive FE310

Signed-off-by: simbit18 <simbit18@gmail.com>

arch/risc-v/src/fe310/CMakeLists.txt

@@ -0,0 +1,40 @@
+# ##############################################################################
+# arch/risc-v/src/fe310/CMakeLists.txt
+#
+# SPDX-License-Identifier: Apache-2.0
+#
+# Licensed to the Apache Software Foundation (ASF) under one or more contributor
+# license agreements.  See the NOTICE file distributed with this work for
+# additional information regarding copyright ownership.  The ASF licenses this
+# file to you 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.
+#
+# ##############################################################################
+
+# Specify our HEAD assembly file.  This will be linked as the first object file,
+# so it will appear at address 0
+
+list(
+  APPEND
+  SRCS
+  fe310_head.S
+  fe310_allocateheap.c
+  fe310_clockconfig.c
+  fe310_gpio.c
+  fe310_irq.c
+  fe310_irq_dispatch.c
+  fe310_lowputc.c
+  fe310_serial.c
+  fe310_start.c
+  fe310_timerisr.c)
+
+target_sources(arch PRIVATE ${SRCS})