===== OpenOCD =====
[[http://openocd.org/|OpenOCD]] 

This is often bundled as part of a build tools suite.

Build Tool Suites which include OpenOCD
  * [[http://www.openstm32.org/Downloading+the+System+Workbench+for+STM32+installer|System Workbench for STM32 installer]]

There is a debian package for OpenOCD, but it is unfortunately out of date.

The other option is to build [[http://openocd.org/|OpenOCD]] from [[http://openocd.zylin.com/openocd|source]]
  * git clone http://openocd.zylin.com/openocd
  * follow the instructions inside the README file.

Use openocd and gdb 
  * first shell window, below is an example
     * openocd -f ~/src/ChibiOS/ChibiStudio/tools/openocd/scripts/board/st_nucleo_f4.cfg
  * second shell window, open gdb or ddd
     * arm-none-eabi-gdb
       * monitor reset halt
       * target remote localhost:3333
       * file build/ch.elf
       * continue

For more details on how to use gdb, Read the manual.
I prefer ddd, which is the graphical interface to gdb.