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Bootloader and Application Code

Thank you for your answers

Sadly I still can’t figure it out.
I included before the jump is executed:
SCB->VTOR = memoryAddress;

When I step through the jump_to function everything seems to be fine.
Just before the SysMemBootJump() it looks like this:

MSP: 0x20010000
PSP: 0x4ef1c2ac
SCB->VTOR: 0x8012000
SysMemBootJump(): 0x0801C509

And the memory at address 0x0812000:


The application should flash an led after the jump is completed but it doesn’t.
It does not lock up but it is stuck in an infinite loop. I disassembled the instructions and it looks like this:

0x8012dfc: mov sp, r7
0x8012dfe: pop {r7}
0x8012e00: bx lr
0x801a1f0: mov r3, r0
0x801a1f2: and.w r3, r3, #512  ; 0x200
0x801a1f6: cmp r3, #0
0x801a1f8: beq.n 0x801a1ea
0x801a1ea: ldr r0, pc, #20  ; (0x801a200)
0x801a1ec: bl 0x8012dec
0x8012dec: push {r7}
0x8012dee: sub sp, #12
0x8012df0: add r7, sp, #0
0x8012df2: str r0, r7, #4
0x8012df4: ldr r3, r7, #4
0x8012df6: ldr r3, r3, #40  ; 0x28
0x8012df8: mov r0, r3
0x8012dfa: adds r7, #12
0x8012dfc: mov sp, r7

Notice that the last command is also the first.
I’m not sure if this helps.

I am using an STM32F107, I don’t know if and how I can disable the data and instruction caches.

Thanks again for your help


I don’t know exactly what washappening, but th ecode you are looping in seems to be that you are looking at an I/O device (its address seems to be in memory at address 0x801a200) waiting for bit 9 (0x200) of register at offset 40 (0x28) in this device to be set and, as this bit is never set, you loop indefinitly.

Now without more information, nobody can help you...

Anyway, does your application works correctly if started through the debugger?

Bernard (Ac6)