julianoes opened a new pull request, #12845:
URL: https://github.com/apache/nuttx/pull/12845

   ## Summary
   
   This adds the necessary defines to set the USARTs' kernel clock source 
selection.
   
   This is required for a configuration where the bootloader (running before 
NuttX) changes the USARTs' clock selection, so they need to be restored on 
board init.
   
   This is according to the reference manual RM0399 page 448.
   
   ## Impact
   
   This should not have an impact unless the defines are actually set in the 
board config.
   
   ## Testing
   
   Tested downstream in PX4 using CubePilot CubeOrange+ with ArduPilot 
bootloader (which sets the clock).
   
   Sponsored by CubePilot.
   
   FYI @davids5 


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