In short: OpenSDA is the newer technology, and new boards from Freescale come with OpenSDA. OSBDM/OSJTAG is pretty much depreciated.
OSBDM/OSJTAG:
- open source firmware (published with hardware reference design), so you can build your own probe based on it.
- for Kinetis (K family) (OSJTAG) and ColdFire/S08 (OSBDM)
- maintained by P&E
- using S08JM60 as processor
- slower than OpenSDA
- 'monolithic': it is just the firmware
- debug mode only, no mass storage bootloader
- supported by multiple tool vendors (CodeWarrior, IAR, Keil, ...)
- You can debug any processor with it
OpenSDA:
- NOT open source (hardware schematics is open), but firmware is closed source, so you cannot build your own probe based on it
- Only for Kinetis (K and L family)
- maintained by P&E
- using Kinetis K20 as processor
- faster than OSBDM/OSJTAG
- 'application loader' concept: you can load on top of the bootloader different application: mass storage bootloader, debug application, ...
- 'application' SDA files from P&E, Segger, USBDM
- supported by multiple tool chains (CodeWarrior, IAR, Keil, ...)
- Using the P&E firmware, you only can debug the processor on the board (not using OpenSDA to debug an off-board processor).
- Otherwise you need to use a different .SDA firmware (see JTAG/SWD Debugging with the FRDM-KL25Z Board, Using the Freedom Board as SWD Programmer)
Maybe I missed something, but I hope it is accurate enough. See as well http://mcuoneclipse.com/2012/09/20/opensda-on-the-freedom-kl25z-board/
I hope this helps.
