BOOTLOADER considers application is not valid

[Miguel]

Hello to all,I have developed a board using the NRF51822; Currently I am using SDK v11, S130 v2.

I have a problem in my bootloader, since bootloader_app_is_valid (from the ble_dfu example from Nordic) is always false.

My application just blinks a led. The application works if there is no bootloader

I am using pure eclipse-gcc under eclipse mars.

i am using nRFgo studio within jlink arm and command line nrfjprog to upload all the softwares to the nRF51822.

I tried all the mergehex options (from devzone.nordicsemi) I even write 0x00000001 to bootloader_settings address and nothing changes.

Any idea on how can i update my code to check if a valid application is stored in flash?

thanks to all Miguel

[Einar Thorsrud]

You write that you have tried writing 0x00000001 to the bootloader settings address so it may be a dead end, but can you have written it to the correct address? You could do it in your application code as described in this post.

Another question: you write that your blinky applications works without a bootloader. I assume that is with the SoftDevice also flashed onto the device? Or does your application start at address 0, leaving no room for the SoftDevice?

[Miguel]

Hello Einar, thank you for your answer. I have written 1 to the 0x0003FC00 using the following command line: nrfjprog --memwr 0x00003FC00 --val 1. Yes you are right the applications works fine but with the softdevice. I am using GCC so your suggestion is not applicable in my case. In SDK 11 the line is:

uint8_t m_boot_settings[CODE_PAGE_SIZE] __attribute__ ((section(".bootloaderSettings")));

[Einar Thorsrud]

In order to set the application valid flag by default using GCC you should use this instead (in bootloader_settings.c):

uint8_t m_boot_settings[CODE_PAGE_SIZE] __attribute__ ((section(".bootloaderSettings"))) = {BANK_VALID_APP};

[Miguel]

I already tried that but the problem remains. The application is always considered invalid by the bootloader.

[Einar Thorsrud]

Can you use a debugger to step through the bootloader_app_is_valid() and see where/why it returns false?