esp32[c3|c6|h2]: Add nuttx toolchain support on mcuboot

arch/risc-v/src/common/espressif/Bootloader.mk

@@ -34,6 +34,7 @@ BOOTLOADER_CONFIG    = $(BOOTLOADER_SRCDIR)/bootloader.conf
 MCUBOOT_SRCDIR     = $(BOOTLOADER_SRCDIR)/mcuboot
 MCUBOOT_ESPDIR     = $(MCUBOOT_SRCDIR)/boot/espressif
 MCUBOOT_URL        = https://github.com/mcu-tools/mcuboot
+MCUBOOT_TOOLCHAIN  = $(TOOLSDIR)/mcuboot_toolchain_espressif.cmake
 
 # Helpers for creating the configuration file
 
@@ -95,7 +96,8 @@ $(BOOTLOADER_BIN): chip/$(ESP_HAL_3RDPARTY_REPO) $(MCUBOOT_SRCDIR) $(BOOTLOADER_
 		-c $(CHIP_SERIES) \
 		-f $(BOOTLOADER_CONFIG) \
 		-p $(BOOTLOADER_SRCDIR) \
-		-e $(HALDIR)
+		-e $(HALDIR) \
+		-d $(MCUBOOT_TOOLCHAIN)
 	$(call COPYFILE, $(BOOTLOADER_OUTDIR)/mcuboot-$(CHIP_SERIES).bin, $(TOPDIR))
 
 bootloader: $(BOOTLOADER_CONFIG) $(BOOTLOADER_BIN)

tools/espressif/build_mcuboot.sh

@@ -11,6 +11,7 @@ usage() {
   echo "  -f <config> Path to file containing configuration options"
   echo "  -p <path> Path to execute the script"
   echo "  -e <hal> Path to HAL directory"
+  echo "  -d <path> Path to toolchain file"
   echo "  -h Show usage and terminate"
   echo ""
 }
@@ -22,7 +23,7 @@ build_mcuboot() {
   local build_dir=".build-${target}"
   local source_dir="boot/espressif"
   local output_dir="${exec_path}/out"
-  local toolchain_file="tools/toolchain-${target}.cmake"
+  local toolchain_file="tools/nuttx-toolchain-${target}.cmake"
   local mcuboot_config
   local mcuboot_flashsize
   local mcuboot_flashmode
@@ -49,6 +50,12 @@ build_mcuboot() {
     mcuboot_flashfreq="40m"
   fi
 
+  if ! [ -z "${nuttx_toolchain}" ]; then
+    cp "${nuttx_toolchain}" "${mcuboot_dir}/${source_dir}/${toolchain_file}"
+  else
+    toolchain_file="tools/toolchain-${target}.cmake"
+  fi
+
   pushd "${exec_path}" &>/dev/null
   mkdir -p "${output_dir}" &>/dev/null
 
@@ -84,7 +91,7 @@ build_mcuboot() {
   popd &>/dev/null
 }
 
-while getopts ":hc:f:p:e:" arg; do
+while getopts ":hc:f:p:e:d:" arg; do
   case "${arg}" in
     c)
       chip=${OPTARG}
@@ -98,6 +105,9 @@ while getopts ":hc:f:p:e:" arg; do
     e)
       esp_hal=${OPTARG}
       ;;
+    d)
+      nuttx_toolchain=${OPTARG}
+      ;;
     h)
       usage
       exit 0

tools/espressif/mcuboot_toolchain_espressif.cmake

@@ -0,0 +1,35 @@
+# ##############################################################################
+# tools/espressif/mcuboot_toolchain_espressif.cmake
+#
+# 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.
+#
+# ##############################################################################
+
+set(CMAKE_SYSTEM_NAME Generic)
+
+set(CMAKE_C_COMPILER riscv-none-elf-gcc)
+set(CMAKE_CXX_COMPILER riscv-none-elf-g++)
+set(CMAKE_ASM_COMPILER riscv-none-elf-gcc)
+
+set(CMAKE_C_FLAGS
+    "-march=rv32imc_zicsr_zifencei"
+    CACHE STRING "C Compiler Base Flags")
+set(CMAKE_CXX_FLAGS
+    "-march=rv32imc_zicsr_zifencei"
+    CACHE STRING "C++ Compiler Base Flags")
+set(CMAKE_EXE_LINKER_FLAGS
+    "-nostartfiles -march=rv32imc_zicsr_zifencei --specs=nosys.specs"
+    CACHE STRING "Linker Base Flags")