DFU update SD+BL SDK15.0 won't change bootloader start address

RE: DFU update SD+BL SDK15.0 won't change bootloader start address

Panchen — Tue, 20 Nov 2018 12:11:39 GMT

Thank you. I will try it.

RE: DFU update SD+BL SDK15.0 won't change bootloader start address

Hung Bui — Mon, 19 Nov 2018 16:06:25 GMT

It's possible, but it's a bit complex and requires you to have 2 step DFU update. First is to update a bootloader that erase the UICR , write new value and getting ready for the next update, then you update the new bootloader with new address.

It's discussed in this thread.

In your case if you only need to update 30pcs, it might be easier just open them and hook the SWD interface in ?

RE: DFU update SD+BL SDK15.0 won't change bootloader start address

Panchen — Mon, 19 Nov 2018 15:38:27 GMT

Yes, I want to use OTA to change bootloader start address. My customer has 30 pcs samples and no SWD connection.

I would like to update bootloader in order to use same start address in 0xE5000. This code can detect if OTA wants to update BL, then change UICR bootloader start address to 0xE6000. Then I can update new bootloader(0xE6000).

Is it possible?

RE: DFU update SD+BL SDK15.0 won't change bootloader start address

Hung Bui — Mon, 19 Nov 2018 10:00:17 GMT

You are saying you are updating the bootloader via OTA DFU ? And you want to change the address of the bootloader. I don't think it's possible. Unless you modify the bootloader to do that specific task. It would be pretty complicated and with a risk of bricking your device. Do you have a lot of devices deployed to the market that requires the bootloader update ?

if you don't have SWD connection to re-program the chip, how do you use IAR to erase and write new value to UICR ?

RE: DFU update SD+BL SDK15.0 won't change bootloader start address

Panchen — Fri, 16 Nov 2018 15:26:37 GMT

Hi Hung,

Thanks for your reply.

I can't use nrfjprog or nRFConnect programming tool to change the start address, because I can't take the product case apart.

How about if using IAR to erase UICR and write new value to UICR?

RE: DFU update SD+BL SDK15.0 won't change bootloader start address

Hung Bui — Fri, 16 Nov 2018 13:54:18 GMT

Hi,

Keil is not able to erase UICR and write new value to UICR. This results in what you observed the new bootloader flashed but the address of the bootloader in UICR is still with the older one.

You would need to do a chip erase if you changing the start address of the bootloader. Either use nrfjprog or nRFConnect programming tool