I'm using NuttX on STM32F373 and saw the config was missing SPI2 and

SPI3, see datasheet:
www.st.com/resource/en/datasheet/stm32f373cc.pdf

I searched for other members of STM32F37XX family and they also have 3 SPIs:
http://www.st.com/content/st_com/en/search.html#q=STM32F37-t=keywords-page=1