Add MCUboot

BOOTLOADER.md

@@ -0,0 +1,25 @@
+# bootloader
+
+## Building
+
+```sh
+cd bootloader/mcuboot/boot/zephyr
+west build -b sam_fd -p always -- \
+    -DCONFIG_SINGLE_APPLICATION_SLOT=y \
+    -DCONFIG_BOOT_SIGNATURE_TYPE_NONE=y \
+    -DCONFIG_BOOT_VALIDATE_SLOT0=n \
+    -DCONFIG_MAIN_STACK_SIZE=1024 \
+    -DCONFIG_MCUBOOT_SERIAL=y \
+    -DCONFIG_CONSOLE=n \
+    -DCONFIG_UART_CONSOLE=n \
+    -DCONFIG_BOOT_SERIAL_WAIT_FOR_DFU=y \
+    -DCONFIG_BOOT_SERIAL_WAIT_FOR_DFU_TIMEOUT=500 \
+    -DCONFIG_BOOT_ERASE_PROGRESSIVELY=y
+```
+
+## Flashing
+
+```sh
+west flash --runner jlink # or
+west flash --runner pyocd
+```

README.md

@@ -19,11 +19,24 @@ west build -b sam_fd sam-fd-sdk/app
 
 ## Flashing
 
+### Using a Debugger
+
 ```sh
 west flash --runner jlink # or
 west flash --runner pyocd
 ```
 
+### Via Serial Recovery
+
+Serial recovery mode can be entered by running a command like the following immediately after resetting. This requires a MCUboot bootloader. Please see [BOOTLOADER.md](BOOTLOADER.md) for instructions on building one.
+
+```sh
+mcumgr \
+    --conntype serial \
+    --connstring dev=/dev/cu.usbserial-110,baud=115200 \
+    image upload -e build/zephyr/zephyr.signed.bin
+```
+
 ## License
 
 Please see [LICENSE](LICENSE). The software side of this project is based on [Zephyr](https://www.zephyrproject.org) which is mostly licensed under the [Apache-2.0](http://www.apache.org/licenses/LICENSE-2.0) license.

app/prj.conf

@@ -9,3 +9,6 @@ CONFIG_CAN=y
 CONFIG_CAN_FD_MODE=y
 CONFIG_LED=y
 CONFIG_LED_GPIO=y
+
+CONFIG_BOOTLOADER_MCUBOOT=y
+CONFIG_MCUBOOT_GENERATE_UNSIGNED_IMAGE=y

boards/arm/sam_fd/sam_fd.dts

@@ -20,6 +20,7 @@
 		zephyr,sram = &sram0;
 		zephyr,flash = &flash0;
 		zephyr,canbus = &can0;
+		zephyr,code-partition = &slot0_partition;
 	};
 
 	aliases {
@@ -69,9 +70,13 @@
 		#address-cells = <1>;
 		#size-cells = <1>;
 
-		storage_partition: partition@3c000 {
-			label = "storage";
-			reg = <0x0003c000 0x00004000>;
+		boot_partition: partition@0 {
+			label = "mcuboot";
+			reg = <0x00000000 0x5000>;
+		};
+		slot0_partition: partition@5000 {
+			label = "image-0";
+			reg = <0x00005000 0xAFFF>;
 		};
 	};
 };

west.yml

@@ -17,3 +17,6 @@ manifest:
         name-allowlist:
           - cmsis
           - hal_atmel
+          - mcuboot
+          - tinycrypt
+          - zcbor