Background DFU support for Bootloader update

[Anantha Keshava]

Does the current background DFU support (if not is there a plan to support) Bootloader and SoftDevice updates? It will be extremely useful to update the BL and SD through the Background DFU method. in SDK 15.2.0, there was code which seemed to allow BL/SD updates like TFTP_DFU_IMAGE_TYPE_BOOTLOADER, TFTP_DFU_IMAGE_TYPE_SOFTDEVICE but there was also TFTP_SOFTDEVICE_UPGRADE_SUPPORT which was set to false. It would be great to get some pointers to documentation for this support or reasons for not taking that course.

[Andy]

What do you mean with background DFU support? I've never heard of that. Can you point me to the documentation of that feature?

[Anantha Keshava]

Please refer to www.nordicsemi.com/.../lib_background_dfu and www.nordicsemi.com/.../background_dfu_bootloader from the documentation. It's a means by which the application can perform firmware update with a double bank DFU. Further there are examples in the IoT under tftp to demonstrate background DFU on nRF5 series.

[Andy]

Interesting. I had actually never seen the IoT libraries in the SDK since it isn't my area of expertise, but it's pretty cool to see that such things are supported!

[bjorn-spockeli]

Anantha Keshava: The Background DFU library exposes a common API for the following tasks:

• Transferring the new firmware to flash memory.
• Validating checksum for each block of the firmware.
• Triggering a swap procedure by entering the bootloader context.

Currently, the only allowed operation is an application update. I do not know if SD and/or BL updates will supported in future releases. 

Best regards

Bjørn