rt-thread-official/bsp/stm32f40x/README.md

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## board info:
STM32F4 discovery
http://www.st.com/internet/evalboard/product/252419.jsp
## note:
in drivers/stm32f4xx_conf.h
```c
/* Redefine the HSE value; it's equal to 8 MHz on the STM32F4-DISCOVERY Kit */
efine HSE_VALUE ((uint32_t)8000000)
```
**================= IAR WARNING =================**
After use `scons --target=iar -s` command to product IAR project, you have to add iar link file manually.
IAR IDE steps:
1. Project-->Options-->Linker
2. Config-->Linker Configuration file
3. select `Override Default`, then select `bsp/stm32f40x/stm32f40x_flash.icf`
4. rebuild project
**TODO**
auto add *.icf by scons script