Port to stm32-p103 for qemu simulation

[konyavic]

It has been tested on qemu only, so we need someone to test it on a real board. Though I have split board- and platform- specific files for sanity, there is not much difference between p103 and discoveryf4. I've modified necessary parts only, and found that most of the code remains duplicate, so I think the hierarchy should be considered again. Maybe it's better to have stm32f4x and stm32f10x merged as one single target.

Btw, I found it works without changing compile option from -mcpu=cortex-m4 to -mcpu=cortex-m3.

Build Instructions

• Build the qemu fork which supports p103 (https://github.com/konyavic/qemu_stm32) (with a trivial bugfix)
• Prefix each make command with BOARD=p103, e.g. BOARD=p103 make config
• Configuration
  • Turn off ELF loader and bit-band region
  • Change debug serial IO to USART2
• Run the command bellow:

<path_qemu_stm32>/arm-softmmu/qemu-system-arm -M stm32-p103 -kernel <path_f9>/build/p103/f9.bin -serial stdio

[muojp]

:+1:

[jserv]

After the effort of enabling QEMU-friendly porting for F9 microkernel, it is straightforward to introduce automated tests accordingly. Thus, Travis CI scripts can be improved as well.

Reference: https://code.google.com/p/chromium/wiki/LinuxChromiumArm

[jserv]

Related: #94 (board support package for STM32F429i Discovery)

[jserv]

Drop this pull request in favor of #97