Shifting Bootloader area using BLE DFU

RE: Shifting Bootloader area using BLE DFU

Einar Thorsrud — Wed, 29 May 2019 09:19:22 GMT

Hi,

[quote user="Yahya Tawil"]can you expect what is wrong in my case ?[/quote]

The code snippet in the original question seems sensible, but there is probably some detail that I am not spotting. The procedure is proven to work, as shown in detail in this post (though for an older SDK).

[quote user="Yahya Tawil"]Yes, I saw it, but I was looking for the details you mentioned : ) if I can get them somewhere in the documentation or as a code (it's closed source as I know).[/quote]

The MBR is closed source as you write, but I will request that the documentation be expanded.

RE: Shifting Bootloader area using BLE DFU

Yahya Tawil — Tue, 28 May 2019 11:40:07 GMT

Thanks Einar for the interesting note about how new MBR get/store Bootloader address.

I use SDK V13 and SD132 V4.

So as my MBR version should uses NRF_UICR->NRFFW[0] value to jump to bootloader, can you expect what is wrong in my case ? Note: I made sure 100% that erasing and updating the NRFFW[0] is working by doing that and check the values in normal App.

[quote userid="7377" url="~/f/nordic-q-a/47814/shifting-bootloader-area-using-ble-dfu/189522"]You can find the MBR documentation under Master boot record and bootloader in the SoftDevice specification.[/quote]

Yes, I saw it, but I was looking for the details you mentioned : ) if I can get them somewhere in the documentation or as a code (it's closed source as I know).

Note: I think this page need to have an update about bootloader address
https://infocenter.nordicsemi.com/index.jsp?topic=%2Fcom.nordic.infocenter.sdk5.v15.0.0%2Flib_bootloader_dfu_process.html

RE: Shifting Bootloader area using BLE DFU

Einar Thorsrud — Tue, 28 May 2019 09:04:36 GMT

Hi,

[quote user=""]So am I miss something, for example the MBR in Softdevice uses the old bootloader address, or what? BTW from where the MBR knows the Address the Bootloader ?[/quote]

Until recently, the MBR found the bootloader address by checking NRF_UICR->NRFFW[0]. If it were set (not all FF), the MBR would jump to the bootloader. However, the MBR shipped with the newest SoftDeices (6.1.1) which was shipped with SDK 15.3 no longer use NRF_UICR->NRFFW[0] but instead places the bootloader start address at the end of the MBR page. This means it is no longer possible to change the bootloader start address by deleting and rewriting a modified UICR page. (this is only half-true, as it is still used if the address is not set within the MBR, for backward compatibility). Which SDK and SoftDevice version do you upgrade to and from?

[quote user=""]and is there any detailed documentation/code for MBR ?[/quote]

You can find the MBR documentation under Master boot record and bootloader in the SoftDevice specification.