The description of how to set MCUBOOT_LOG_LEVEL in tfm_secure_boot.rst appears wrong, or at least unclear. --- - MCUBOOT_LOG_LEVEL: Can be used to configure the level of logging in MCUBoot. The possible values are the following:
- **LOG_LEVEL_OFF** - **LOG_LEVEL_ERROR** - **LOG_LEVEL_WARNING** - **LOG_LEVEL_INFO** - **LOG_LEVEL_DEBUG**
The logging in MCUBoot can be disabled and thus the code size can be reduced by setting it to ``LOG_LEVEL_OFF``. Its value depends on the build type. If the build type is ``Debug`` and a value has been provided (e.g. through the command line or the CMake GUI) then that value will be used, otherwise it is ``LOG_LEVEL_INFO`` by default. In case of different kinds of ``Release`` builds its value is set to ``LOG_LEVEL_OFF`` (any other value will be overridden). ---
I tried enabling MCUBOOT_LOG_LEVEL_DEBUG by adding -DMCUBOOT_LOG_LEVEL=LOG_LEVEL_DEBUG to the cmake command line, but that set the level to -1. I also tried -DMCUBOOT_LOG_LEVEL=4, which also set it to -1. I then noticed that the default setting in CMakeCache.txt is "MCUBOOT_LOG_LEVEL:STRING=INFO", so I instead used -DMCUBOOT_LOG_LEVEL=DEBUG, which worked.
I would also like to be able to use logging for Release builds, as this may assist chasing down optimization issues.
Thomas