fjpanag opened a new pull request #1544:
URL: https://github.com/apache/incubator-nuttx/pull/1544


   ## Summary
   STM32 IO compensation cell is enabled after clocking to SYSCFG is enabled.
   Currently the IO compensation cell is enabled before the call to 
rcc_enableperipherals(). Thus the peripheral SYSCFG is accessed before clocking 
is enabled.
   
   ## Impact
   If CONFIG_STM32_SYSCFG_IOCOMPENSATION is enabled, code hangs while it waits 
for the IO cell to be ready.
   
   ## Testing
   Tested on custom board (based on an STM32F427VI), and after the fix boot 
proceeds normally, with IO compensation cell enabled.
   


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