MCUBoot stuck after 'Jumping to first image slot'

[allard.p]

I'm trying to integrate MCUboot into my application, as immutable bootloader (CONFIG_BOOTLOADER_MCUBOOT=y). Building succeeded, but after programming the board gets stuck at 'I: Jumping to the first image slot'. To verify I also tried the hello_world example, only enabling MCUboot in the .conf, this results in the same problem.

When I try to debug in VScode main is never reached and I'm unable to halt. When I try Ozone I can see that the board is stuck at address 0x000196C8 which is a branch instruction to itself (so a while(1) loop).

In partitions.yml in the build folder I can find the following:

tfm:
  address: 0x10200
  end_address: 0x20200
  inside:
  - mcuboot_primary_app
  placement:
    before:
    - app
  region: flash_primary
  size: 0x10000

Address 0x000196C8 is within this range, so I guess the board becomes stuck in TF-M. There is no output on UART1. I found another Q&A about this topic, where someone stated this is a known issue, but I cannot find a entry of this in the known issue list of NCS 2.1.0. What is going on here? Is it my custom board? How do I debug TF-M?

I'm using:

NCS 2.1.0

Hello world example

Custom board

[allard.p]

I managed to debug this further. The application is successfully booted by MCUBOOT, but is stuck in TFM initialization.

It is stuck on the following assert inside nrf_spu_flashregion_set:

NRFX_ASSERT(!(p_reg->FLASHREGION[region_id].PERM & SPU_FLASHREGION_PERM_LOCK_Msk));

The function is called with the following arguments:

p_reg: 0x500030000

region_id: 0

secure_attr: true

permissions: 7

lock_conf: false

and p_reg->FLASHREGION[0].PERM is 277

The call stack is the following:

nrf_spu_flashregion_set

spu_regions_reset_all_secure

spu_init_cfg

tfm_hal_set_up_static_boundaries

tfm_core_init

main

Any ideas what is going on here? Solutions given in this topic  do not work.