esp32c3: Add MCUboot support files for testing

Signed-off-by: Gustavo Henrique Nihei <[email protected]>

esp32c3-hal/src/lib.rs

@@ -70,6 +70,7 @@ extern "C" {
                 num: u32,
                 fixed: u32,
             ) -> i32;
+            fn esp_rom_printf(format: *const u8, ...) -> i32;
 
             /* IROM metadata:
              * - Destination address (VMA) for IROM region
@@ -424,6 +425,9 @@ pub fn mp_hook() -> bool {
     #[cfg(feature = "mcuboot")]
     unsafe {
         configure_mmu();
+
+        static MESSAGE: &[u8] = b"Welcome to Rust from MCUboot!\n\0";
+        esp_rom_printf(MESSAGE.as_ptr());
     }
 
     unsafe {

esp32c3-hal/test_mcuboot.sh

@@ -0,0 +1,37 @@
+#!/usr/bin/env bash
+#
+#  Copyright (c) 2022 Espressif Systems (Shanghai) Co., Ltd.
+#
+# SPDX-License-Identifier: Apache-2.0
+#
+
+SCRIPT_NAME=$(basename "${BASH_SOURCE[0]}")
+
+set -eo pipefail
+
+usage() {
+  echo ""
+  echo "USAGE: ${SCRIPT_NAME} <ELF>"
+  echo ""
+}
+
+if [ -z "${1}" ]; then
+  echo "ERROR: Missing application ELF file."
+  usage
+  exit 1
+fi
+
+# MCUboot's tool for image signing and key management
+if ! command -v imgtool &> /dev/null; then
+  echo ""
+  echo "imgtool not found. Please run: \"pip install imgtool\""
+  echo ""
+  exit 1
+fi
+
+elf_file=${1}
+
+objcopy -O ihex "${elf_file}" app.hex
+imgtool sign --pad --align 4 -v 0 -s auto -H 32 --pad-header -S 0x100000 app.hex app.bin
+esptool.py -c esp32c3 -p /dev/ttyUSB0 -b 921600 --after no_reset write_flash -fs 4MB -fm dio -ff 40m 0x0 ./mcuboot-esp32c3.bin 0x110000 ./app.bin
+picocom -b 115200 /dev/ttyUSB0 --imap lfcrlf