Zigbee FOTA implementation

[i3pdmaguirre]

Question:

What configuration should be added for MCUboot to become aware of the size of external flash the hardware provides? 

Is there documentation of the mcu kconfig options?

I am in the process of integrating the Zigbee fota example to run on our custom hardware.

During initial development we worked with the nrf5340-development kit in order to perform initial application testing including the Zigbee FOTA example while the hardware development took place.

Our custom hardware implementation employs the NORA-B126 and replaced the external flash with the MX25R1635FZUIL0.

However the bootloader appaars unable to find a valid application image to jump to as shown by the message shown via the debug log

*** Booting Zephyr OS build v3.1.99-ncs1  ***
I: Starting bootloader
I: Swap type: none
I: Swap type: none
E: Unable to find bootable image

From our investigation we learned that mcuboot (in addition to the application) need their own configuration and overlay files. Therefore we have included the following config changes for project_app/child_image/mcuboot/boards/nrf5340dk_nrf5340_cpuapp.conf

#

# Copyright (c) 2022 Nordic Semiconductor ASA

#

# SPDX-License-Identifier: LicenseRef-Nordic-5-Clause

#

# Increase main stack size

CONFIG_HEAP_MEM_POOL_SIZE=32768

# Configure logger

CONFIG_LOG=y

CONFIG_LOG_MODE_MINIMAL=y # former CONFIG_MODE_MINIMAL

CONFIG_LOG_DEFAULT_LEVEL=0

### Decrease footprint by ~4 KB in comparison to CBPRINTF_COMPLETE=y

CONFIG_CBPRINTF_NANO=y

# Configure MCUboot features

CONFIG_NRF53_MULTI_IMAGE_UPDATE=y

CONFIG_BOOT_UPGRADE_ONLY=y

CONFIG_BOOT_MAX_IMG_SECTORS=1024

CONFIG_MCUBOOT_DOWNGRADE_PREVENTION=y

# Allow for storing two images in MCUboot partitions

CONFIG_UPDATEABLE_IMAGE_NUMBER=2

# Store new images inside external flash

CONFIG_PM_EXTERNAL_FLASH_MCUBOOT_SECONDARY=y

# Enable flash simulator

CONFIG_PCD_APP=y

CONFIG_FLASH_SIMULATOR=y

CONFIG_FLASH_SIMULATOR_DOUBLE_WRITES=y

CONFIG_FLASH_SIMULATOR_STATS=n

# Configure QSPI for external flash

CONFIG_MPU_ALLOW_FLASH_WRITE=y

CONFIG_FLASH=y

CONFIG_SPI=n

CONFIG_SPI_NOR=n

CONFIG_NORDIC_QSPI_NOR=y

CONFIG_NORDIC_QSPI_NOR_FLASH_LAYOUT_PAGE_SIZE=4096

[Amanda Hsieh]

Hi, 

Do you create a overlay like this nrf5340dk_nrf5340_cpuapp.overlay and include the content of https://github.com/nrfconnect/sdk-zephyr/blob/main/boards/arm/nrf5340dk_nrf5340/nrf5340_cpuapp_common.dts#L173-L198 for your external flash? If not, please do it.

For the config of nRF5340 Zigbee FOTA, please refer to:
https://github.com/nrfconnect/sdk-nrf/blob/e6c201742e685591dbc7416e3239fcd45e095e07/samples/zigbee/light_switch/boards/nrf5340dk_nrf5340_cpuapp_fota.conf 

Regards,
Amanda H.

[i3pdmaguirre]

 Amanda Hsieh 

Yes, we have an overlay for cpu_app  that includes the new flash.

We have confirmed that we can use this flash on the application code prior to attempting to include the configurations needeed to include Zigbee FOTA & MCUBoot.

```

&qspi {

status = "okay";

pinctrl-0 = <&qspi_default>;

pinctrl-1 = <&qspi_sleep>;

pinctrl-names = "default", "sleep";

mx25r16: mx25r1635f@0 {

compatible = "nordic,qspi-nor";

reg = <0>;

size = <16777216>;

/* MX25R64 supports only pp and pp4io */

writeoc = "pp4io";

/* MX25R64 supports all readoc options */

readoc = "read4io";

sck-frequency = <8000000>;

label = "MX25R16";

jedec-id = [C2 28 15];

sfdp-bfp = [

e5 20 f1 ff ff ff ff 00 44 eb 08 6b 08 3b 04 bb

ee ff ff ff ff ff 00 ff ff ff 00 ff 0c 20 0f 52

10 d8 00 ff 23 72 f5 00 82 ed 04 c3 44 83 48 44

30 b0 30 b0 f7 c4 d5 5c 00 be 29 ff f0 d0 ff ff

];

has-dpd;

t-enter-dpd = <10000>;

t-exit-dpd = <35000>;

};

};

[Amanda Hsieh]

Hi, 

I think you can take look at the board and child image configurations in the Zigbee: Light switch samples to see how they are configuring the FOTA with ext flash using our onboard flash IC. 

The FOTA samples usually set this "chosen" in the overlay as https://github.com/nrfconnect/sdk-nrf/blob/e6c201742e685591dbc7416e3239fcd45e095e07/samples/zigbee/light_switch/child_image/mcuboot/boards/nrf5340dk_nrf5340_cpuapp_fota.overlay It's worth to try. 

-Amanda H.