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1. Use RT_USING_LIBC instead of RT_USING_NEWLIB in the beagonebone. 2. Enable LIBC in default in LPC4088. 3. Remove the unnecessary interrupt clean in STM32 UART; 4. Use HSE_VALUE to calculate PLL_M in STM32F2/F4;
board info: stm32f0discovery http://www.st.com/stm32f0discovery