Is it possible to update the SoftDevice S112 on nRF52810 using in-place model through UART

[BenEdna]

As the S112 Bootloader documentation mentions, the nRF52810 does not support updating the (S112) SoftDevice.

In another question "The update-risk preventive method?"  it was mentioned that:

"When the application is downloaded, the old application is always deleted (the in-place application update model is used)."

• Would it be feasible to use a similar in-place update model for the S112 SoftDevice when using the UART DFU on nRF52810?

[Hakon]

Yes, I think it should be possible. It should work with the secure_bootloader_uart_mbr_pca10040e example.

[BenEdna]

Thanks Hakon!

Looking at the referenced example and DFU process for an application in single-bank mode, am I right (on a very high-level) it is something along the lines of:

Creating a similar mechanism to NRF_DFU_SINGLE_BANK_APP_UPDATES for Softdevice:

• In nrf_dfu_utils let nrf_dfu_cache_prepare clear and return the SoftDevice location
• Make sure in-place SoftDevice is validated (postvalidate_sd_bl)
• Skip writing of SoftDevice after validation, since it is already in-place

[Hakon]

Yes, that's correct as far as I know.