Simple Bootloader

[superpak]

Hi,

SDK14.0 nRF52832

I am using the dfu\bootloader_secure_ble example as my starting point. My goal is to create a very simple bootloader (with none of the dfu stuff, no SD functionality). Just a simple bootloader that the MBR jumps to when the board is powered on. This bootloader in turn starts another application and that's it!

This is what I am doing:

1. completely erase the board using nrfjprog
2. flash the softdevice
3. flash the bootloader

---up until this point the bootloader is able to run, now I want to flash an app so the bootloader can give control to this app---

4.flash a BLE app (ble_blinky)

result: I look at the terminal and I get a "Fatal" error message. This comes up during the call to nrf_sdh_enable_request.

It seems to me that the Bootloader is able to start the app, but the app gives an error.

Can someone point me to the right direction on what I am missing here? This app works fine if I just flash the SD and the APP. But when I flash the SD, then the Bootloader and then the app, I get this "Fatal" error.

[MartinBL]

Hi, If you debug like this, you will probably find an error code that might give us a clue about what is wrong.

[superpak]

Thanks for pointing that out, Martin. I have attached the error info. Please let me know!

[MartinBL]

What is going on around line 449 (hexadecimal 0x1C1) in your main.c file?

[superpak]

Hi Martin, thanks for following up. I have attached a new image that shows where the error is. As I mentioned before, it is when we call nrf_sdh_enable_request().

[superpak]

The problem is that I am not not forwarding the SD vector table to the application in my bootloader and therefore when I try to use any SD calls in my main application, I get the error.

If I initialize the SD using nrf_dfu_mbr_init_sd(); and then set the vector table address using sd_softdevice_vector_table_base_set(start_addr); in my bootloader everything works fine.

I want my bootloader to be completely independent of SD or any SD calls. How do I forward the vector table to the app without using the SD calls?