jtag programming and debug

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Greetings.
Has anyone experience of using jtag tools by Marcel Telka. I would like
to use it with GDB to develop an ARM based datalogger (MCU not selected
yet) and also with a DSP project using Blackfin or TI DSP.


How does the software compare with proprietary debug tools from IAR;
Metroworks etc?

Is the user interface very low level (at this stage) requiring a lot of
user written code to be useful?

Is the protocol for the basic facilities similar in all processors eg
flash write; register dump?

Is it a case that the clever stuff like On Chip Emulation will always be
  proprietary and therefore advantageous to use the manufacturer's own
jtag pod?

TIA
Joseph Casey.


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