pussuw commented on pull request #5782:
URL: https://github.com/apache/incubator-nuttx/pull/5782#issuecomment-1076325061


   Maybe to add some implicit information that is missing. The S-mode 
implementation is a requirement for CONFIG_BUILD_KERNEL=y, which requires MMU 
mappings for the user- and kernelspaces. MMU is not active in M-mode, this is 
why the kernel must run in S-mode instead.
   
   Using S-mode in CONFIG_BUILD_FLAT is not really feasible, this is why the 
dependency `depends on BUILD_KERNEL && ARCH_USE_MMU` was added to the kconfig 
parameter


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