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After the first time system_mode is set to one, the assets will no longer be read- or writeable, even if system_mode is set to zero at a later syscall. This is to make sure syscalls does not have the same privilege as the firmware has at first boot. We need to monitor when system_mode is set to one, otherwise we might accedentially lock the assets before actually leaving firmware, for example if firmware would use a function set in any of the registers used in system_mode_ctrl. Co-authored-by: Mikael Ågren <mikael@tillitis.se>