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PX4 contrib from <jose.souza@intel.com> 1) stm32: Fix erase sector number for microcontrolers with more than 11 sectors Erase a sector from the second bank cause the bit 4 of SNB being set but never unsed, so trying to erase a sector from the first bank was acually eraseing a sector from the second bank. 2) stm32: Make up_progmem thread safe Writing to a flash sector while starting the erase of other sector have a undefined behavior so lets add a [staticaly initalized] semaphore and syncronize access to Flash registers. 3) Add workaround for flash data cache corruption on read-while-write This is a know hardware issue on some STM32 see the errata of your model and if you make use of both memory banks you should enable it. 4) Greg's cleanup 5) PX4 clean up stm32_flash:Need conditional on non F4 targets