Device Firmware Upgarde with MCUBoot succeeds, but runs original image

[rudkal]

I am trying to run a Device Firmware Update on an ESP32C3 with MCUBoot using CAN. I am using the flash_img_api to write a new firmware into slot1 partition after which I request a swap to it from MCUBoot using boot_request_upgrade.

The steps that I do are:

1. Transfer 8-byte CAN messages to the ESP32C3 and copy the data to a 1024-byte buffer.

2. When the 1024-byte buffer is full I write it to the slot1_partition flash area using flash_img_buffered_write. I get the flash area ID like this:

    #define SLOT1_PARTITION		slot1_partition
    #define DOWNLOAD_FLASH_AREA_ID FIXED_PARTITION_ID(SLOT1_PARTITION)
   

3. I clear the 1024-byte buffer and repeat till the whole new firmware is received.

4. I check that the MCUBoot header is valid using boot_read_bank_header

5. I request MCUBoot to do a test swap with boot_request_upgrade

6. Reboot with sys_reboot(SYS_REBOOT_COLD);

All of the functions return 0 i.e. succeed and when rebooting after the swap request I get:

[esp32c3] [INF] Image index: 0, Swap type: test
[esp32c3] [INF] Loading image 0 - slot 0 from flash, area id: 1

There is a noticeable pause after the Swap type: test line during booting which I think means that the swap is happening, but the original image is still loaded. The received firmware is not run. I cannot find similar issues like this online, I have tried looking into how other firmware upgrade libraries and samples do this to no success.

Here is the flash DTS for the ESP32C3:

&flash0 {
status = "okay";
partitions {
	compatible = "fixed-partitions";
	#address-cells = <1>;
	#size-cells = <1>;

	/* Reserve 60kB for the bootloader */
	boot_partition: partition@0 {
		label = "mcuboot";
		reg = <0x00000000 0x0000F000>;
		read-only;
	};

	/* Reserve 1024kB for the application in slot 0 */
	slot0_partition: partition@10000 {
		label = "image-0";
		reg = <0x00010000 0x00100000>;
	};

	/* Reserve 1024kB for the application in slot 1 */
	slot1_partition: partition@110000 {
		label = "image-1";
		reg = <0x00110000 0x00100000>;
	};

	/* Reserve 256kB for the scratch partition */
	scratch_partition: partition@210000 {
		   label = "image-scratch";
		   reg = <0x00210000 0x00040000>;
	};

	storage_partition: partition@250000 {
		label = "storage";
		reg = <0x00250000 0x00006000>;
	};
};
};