Failed to build FOTA firmware (nRF 1.9.1)

I was able to update the nRF5340 DK using the peripheral_uart sample and following the steps in DFU over Bluetooth. Here is the sample I used, 

Here is the diff of the changes I applied to peripheral_uart:

diff --git a/samples/bluetooth/peripheral_uart/prj.conf b/samples/bluetooth/peripheral_uart/prj.conf
index e5262de64..e055dfb1e 100644
--- a/samples/bluetooth/peripheral_uart/prj.conf
+++ b/samples/bluetooth/peripheral_uart/prj.conf
@@ -48,3 +48,24 @@ CONFIG_LOG_BACKEND_RTT=y
 CONFIG_LOG_BACKEND_UART=n
 
 CONFIG_ASSERT=y
+
+# Enable mcumgr.
+CONFIG_MCUMGR=y
+
+# Enable most core commands.
+CONFIG_MCUMGR_CMD_IMG_MGMT=y
+CONFIG_MCUMGR_CMD_OS_MGMT=y
+
+# Ensure an MCUboot-compatible binary is generated.
+CONFIG_BOOTLOADER_MCUBOOT=y
+
+# Allow for large Bluetooth data packets.
+CONFIG_BT_L2CAP_TX_MTU=252
+CONFIG_BT_BUF_ACL_RX_SIZE=256
+
+# Enable the Bluetooth (unauthenticated) and shell mcumgr transports.
+CONFIG_MCUMGR_SMP_BT=y
+CONFIG_MCUMGR_SMP_BT_AUTHEN=n
+
+# Some command handlers require a large stack.
+CONFIG_SYSTEM_WORKQUEUE_STACK_SIZE=4096
\ No newline at end of file
diff --git a/samples/bluetooth/peripheral_uart/src/main.c b/samples/bluetooth/peripheral_uart/src/main.c
index 8a1ca1e50..c1445c13e 100644
--- a/samples/bluetooth/peripheral_uart/src/main.c
+++ b/samples/bluetooth/peripheral_uart/src/main.c
@@ -32,6 +32,10 @@
 
 #include <logging/log.h>
 
+#include <mgmt/mcumgr/smp_bt.h>
+#include "os_mgmt/os_mgmt.h"
+#include "img_mgmt/img_mgmt.h"
+
 #define LOG_MODULE_NAME peripheral_uart
 LOG_MODULE_REGISTER(LOG_MODULE_NAME);
 
@@ -76,7 +80,9 @@ static const struct bt_data ad[] = {
 };
 
 static const struct bt_data sd[] = {
-	BT_DATA_BYTES(BT_DATA_UUID128_ALL, BT_UUID_NUS_VAL),
+	BT_DATA_BYTES(BT_DATA_UUID128_ALL,
+		      0x84, 0xaa, 0x60, 0x74, 0x52, 0x8a, 0x8b, 0x86,
+		      0xd3, 0x4c, 0xb7, 0x1d, 0x1d, 0xdc, 0x53, 0x8d),
 };
 
 #if CONFIG_BT_NUS_UART_ASYNC_ADAPTER
@@ -571,6 +577,10 @@ void main(void)
 	if (IS_ENABLED(CONFIG_BT_NUS_SECURITY_ENABLED)) {
 		bt_conn_auth_cb_register(&conn_auth_callbacks);
 	}
+	printk("build time: " __DATE__ " " __TIME__ "\n");
+	os_mgmt_register_group();
+	img_mgmt_register_group();
+	smp_bt_register();
 
 	err = bt_enable(NULL);
 	if (err) {

Here is the output I got

*** Booting Zephyr OS build v2.7.99-ncs1-1  ***
I: Starting bootloader
I: Primary image: magic=unset, swap_type=0x1, copy_done=0x3, image_ok=0x3
I: Secondary image: magic=unset, swap_type=0x1, copy_done=0x3, image_ok=0x3
I: Boot source: none
I: Swap type: none
I: Bootloader chainload address offset: 0xc000
I: Jumping to the first image slot
*** Booting Zephyr OS build v2.7.99-ncs1-1  ***
Starting Nordic UART service example
build time: Jun  7 2022 14:22:19
*** Booting Zephyr OS build v2.7.99-ncs1-1  ***
I: Starting bootloader
I: Primary image: magic=unset, swap_type=0x1, copy_done=0x3, image_ok=0x3
I: Secondary image: magic=good, swap_type=0x2, copy_done=0x3, image_ok=0x3
I: Boot source: none
I: Swap type: test
I: Bootloader chainload address offset: 0xc000
I: Jumping to the first image slot
*** Booting Zephyr OS build v2.7.99-ncs1-1  ***
Starting Nordic UART service example
build time: Jun  7 2022 14:24:45

1. How to make the project build for multi-image FOTA, BLE updates? Do I need to include the following in the MCUboot configuration?

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CONFIG_BOOT_UPGRADE_ONLY - The simultaneous update of multiple images does not support network core image reversion, so you need to disable application image reversion.

CONFIG_PCD_APP - Enable commands exchange with the network core.

CONFIG_UPDATEABLE_IMAGE_NUMBER - Enable support for multiple update partitions by setting this option to 2.

No, if you just want to update the application, you don't need to add these

2. I haven't found any nRF samples that demonstrate how to do an FOTA update via BLE, using the nRF5340-DK. Can you please point me to any?

Check my attached sample above

3. The peripheral_uart example uses external flash for the FOTA update. We don't have an external flash chip on our custom board, will there be enough space in the internal flash storage? I read here there may not be enough: https://developer.nordicsemi.com/nRF_Connect_SDK/doc/latest/nrf/ug_thingy53.html#external-flash But we do have an SD card which we could use.

I was able to perform a DFU using the peripheral_uart and the nRF5340 without using external flash (confirmed it by running ninja partition_manager_report from the build folder). However, if your application is large, you might need to use external flash.

Also, could you change your title and include 'nRF5340', so other people can find it more easily

Best regards,

Simon

Thanks for the prompt reply user72692. I've managed to update the application of the main processor, but I cannot update both the application processor and the network processor at the same time, using `CONFIG_UPDATEABLE_IMAGE_NUMBER=2`. I am getting the `BUILD_ASSERT(IMG_MGMT_UPDATABLE_IMAGE_NUMBER == 1` error when I try that. Is the only option to update one processor at a time? This is not ideal. 

P.S.: I am not sure I can update the title. 

Thanks for the prompt reply user72692. I've managed to update the application of the main processor, but I cannot update both the application processor and the network processor at the same time, using `CONFIG_UPDATEABLE_IMAGE_NUMBER=2`. I am getting the `BUILD_ASSERT(IMG_MGMT_UPDATABLE_IMAGE_NUMBER == 1` error when I try that. Is the only option to update one processor at a time? This is not ideal. 

P.S.: I am not sure I can update the title. 

d.p said:

Thanks for the prompt reply Simon. I've managed to update the application of the main processor, but I cannot update both the application processor and the network processor at the same time, using `CONFIG_UPDATEABLE_IMAGE_NUMBER=2`. I am getting the `BUILD_ASSERT(IMG_MGMT_UPDATABLE_IMAGE_NUMBER == 1` error when I try that. Is the only option to update one processor at a time? This is not ideal. 

Could you take a look at the machine learning sample and copy the approach there. It supports multi-image update. If this approach doesn't help you, please let me know, and I will take a deeper look at it (I don't have too much experience with multi image DFU currently). Take a look at this page as well: https://developer.nordicsemi.com/nRF_Connect_SDK/doc/1.9.1/nrf/ug_nrf5340.html#simultaneous-multi-image-dfu 

We don't have an external flash chip on our custom board, will there be enough space in the internal flash storage?

I just talked to a developer internally, and got informed that multi img DFU (update netcore and appcore) is not supported without external flash at the moment. My apologies for that.

I read here there may not be enough: https://developer.nordicsemi.com/nRF_Connect_SDK/doc/latest/nrf/ug_thingy53.html#external-flash But we do have an SD card which we could use.

I have not tested this, but I think that it should be possible put the secondary slot in the SD card. See https://devzone.nordicsemi.com/f/nordic-q-a/85987/mcuboot-secondary-slot-in-external-spi-flash

Best regards,

Simon