Posted on May 17, 2011 at 12:23I know of 2 open hardware USB JTAG devices that are friendly to OpenOCD: The Olimex Arm-USB-OCD and the Amontec JTAGKey. I strongly prefer USB devices over wigglers because they're faster and most people don't have parallel ports any more.
There is an open Windows driver for gdb that uses the Jlink device, and it's called the JlinkServer. Actually, the driver itself is closed, but it's free and it has an open API that gdb can work with. I don't know for sure if this driver will work on the STM32. And it defintely won't work in the SWD mode.
I don't know of any open source driver for the popular Ulink JTAG emulators. This is a bummer because I have several of these. They only work with the Keil/Arm toolchain.
Likewise, I don't know of any open drivers for the Raisonance Rlink USB emulator. If you own either a Ulink or and Rlink you're out of luck with open source.
I wondor if Olimex or Amontec would consider supporting the SWD debugging mode on the Cortex M3, or if another company would make this kind of device for USB and SWD?
The best forum that is specifically for OpenOCD is the Sparkfun forum. But most people there aren't using the Cortex M3.
Now that NXP has announced Cortex M3 chips for late in 2008, that might generate more interest in this core. Maybe some Arm7 people will start looking at the STM32 now. It seems like the M3 is heading for success, and the STM32 and Luminary Stellaris might benefit because they are already in this space.
Eric
