rt-thread/bsp/stm32f40x/readme.txt

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board info:
STM32F4 discovery
http://www.st.com/internet/evalboard/product/252419.jsp
note:
in drivers/stm32f4xx_conf.h
/* Redefine the HSE value; it's equal to 8 MHz on the STM32F4-DISCOVERY Kit */
#define HSE_VALUE ((uint32_t)8000000)