Can Not Load the merged Hex File

[sara]

Hello,

Environment: Keil v5.14.0.0, RAM 16kB, Flash 256kB

1. SoftDevice s110 v8.0

2. bootloader

   IROM1: Start: 0x3C000 Size: 0x3C00

   IRAM1: Start: 0x20002C00 Size: 0x1380

   IRAM2: Start: 0x20003F80 Size: 0x80 (check NoInit for IRAM2)

3. Application

   IROM1: Start: 0x18000 Size: 0x28000

   IRAM1: Start: 0x20002000 Size: 0x2000

I'm using "nrfutil.exe" to merge all of these files (SoftDevice, Bootloader and Application) to "sd_blr_app.hex". After flashed "sd_blr_app.hex" by "nrfutil.exe", only can find the dfu device on the master control panel. It seems the application didn't work.

But, when I just merge "SoftDevice and Application", the application worked.

Do I set the wrong RAM size or miss something?

Thanks.

[Stefan Birnir Sverrisson]

Hi

I suspect you are missing to validate the application. If you do not do that, the bootloader will validate the application as faulty and will therefore start the device in bootloader mode. There is a fourth hex file available on this thread, the app_valid_setting_apply.hex, that you can merge with the other three in order to validate the application and make the bootloader start it.

[sara]

It worked, thanks for your help.