mintisan opened a new issue #1287: blinky demo for STM32F4-Discovery not works 
on STM32F429I-Discovery
URL: https://github.com/apache/mynewt-core/issues/1287
 
 
   I followed the steps on [Blinky, your “Hello World!”, on 
STM32F4-Discovery](https://mynewt.apache.org/latest/tutorials/blinky/blinky_stm32f4disc.html).
   
   And every step's result looks fine.
   
   But doesn't work at all, even I try to reset the board.
   
   I also tried to flash the binary directly with command below:
   ```
   st-flash write 
/Users/linjinhui/Github/mynewt/blinking/bin/targets/stm32f4disc_blinky/app/apps/blinky/blinky.elf.bin
 0x8000000
   ```
   
   But I can blink the leds with mbed demo or STM32Cube via `st-link`. 
   
   So the hardware is OK.
   
   Versions:
   - Apache Newt version: 1.4.1
   - masOS 10.11.6
   - Open On-Chip Debugger 0.10.0
   -  st-flash --version v1.4.0
   - arm-none-eabi-gcc (GNU Tools for Arm Embedded Processors 7-2017-q4-major) 
7.2.1 20170904 (release) [ARM/embedded-7-branch revision 255204]
   
   
   Do I skip any important steps?
   
   

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