Softdevice address not correct in RAM position 0x20000000

[Msv]

Hi!

In our development we are using nrf52833 and for the first development phase we used the SDK 17.0.0. In that case I used the usbd_ble_uart example with s113 and it works as expected. Now we have migrated to SDK 17.0.2 where we intergrate the usbd functionality to another project using the softdevice s140. The problem is that when sd_softdevice_enable() function is called the softdevice address at position 0x20000000 is not 0x0100 as expected it's 0xA801BE00 and therefor the init of the softdevice crash.

BR

[Msv]

We are not using a bootloader I have checked the mbr addresses at the beginning of hte flash and the uicr register they are unitialized. So what could be the problem ?

[Msv]

What can happen in the softdevice during startup that could cause it to crash ?

[Einar Thorsrud]

Not much this early, to be honest. Have you written anything to the UICR? If so, could it be that you accidentally wrote to address 0x10001014? If so the MBR would think that whatever value is there is the start address of the bootloader and would forward interrupts there and branch to it. Could that be what is going on?