git clone http://git.code.sf.net/p/nuttx/git nuttx

cd tools/

./configure.sh stm32f4discovery/usbnsh

Add FPU in SystemType -> FPU_SUPPORT

make CROSSDEV=arm-bare_newlib_cortex_m4-eabi- ARCROSSDEV=arm-bare_newlib_cortex_m4-eabi- -j 4

 

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