S120 with bootloader issue

[Jo-Jo]

I am trying to write a bootloader that will work with the S120. Both the examples seem to only work with the S110, so they don't help much. I already have the binary I want to load in external flash, so I don't need to use the SoftDevice in the bootloader. I first wanted to make sure I could execute my application from the bootloader, but it doesn't seem to work. I have a single function call in the bootloader as follows:

__asm void StartApp(uint32_t start_addr) {

LDR   R2, [R0]               ; Get App MSP.
MSR   MSP, R2                ; Set the main stack pointer to the applications MSP.
LDR   R3, [R0, #0x00000004]  ; Get application reset vector address.
BX    R3                     ; No return - stack code is now activated only through SVC and plain interrupts.
ALIGN  

}

I pass in address 0x18000 for the start_addr. Whenever I call this function the bootloader just gets stuck in in the SVC_HAndler.

Can anyone tell me how to jump to my application from the bootloader?

[Petter Myhre]

Are you setting the base address of the interrupt vector table for interrupts forwarded from the SoftDevice using sd_softdevice_vector_table_base_set()?

[Jo-Jo]

Thanks for the response. I figured out some time back that I needed to tell the SD to forward the interrupts.

[Petter Myhre]

If you figured out the answer to your question on your own, I would appreciate if you could do the community a favor and answer your own question. Or you could accept mine, if you find it sufficient. Thanks.