Debugging MIPS cpu with a probe, how?
Hello!
I have an embedded system, a box, with a MIPS processor on it, which I need to debug (stop and start the processor, tell what instructions it has previously executed, etc.). I also have an EJTAG probe, which I have connected between the computer's usb and the box, and written software for it. The software can communicate with the probe, which in its own turn can communicate with the box through the tap (test access port), by giving the tap certain instructions. It can also, through the tap, feed the MIPS processor with instructions, and read/write data from processor registers.
The question is now, how can debug the processor? How do I stop it, do I have to send any certain instructions to it? How can I set a breakpoint (which I understand is a quite crucial point)? Can I use GDB with my software to help debug the processor and how do I do that?
Thank you in advance!
/Kristofer Krus
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See: http://www.linux-mips.org/wiki/JTAG for references...
//Markus
Quoted 12 lines · TriKri
Hello!
I have an embedded system, a box, with a MIPS processor on it, which I need to debug (stop and start the processor, tell what instructions it has previously executed, etc.). I also have an EJTAG probe, which I have connected between the computer's usb and the box, and written software for it. The software can communicate with the probe, which in its own turn can communicate with the box through the tap (test access port), by giving the tap certain instructions. It can also, through the tap, feed the MIPS processor with instructions, and read/write data from processor registers.
Quoted 7 lines
The question is now, how can debug the processor? How do I stop it, do I have to send any certain instructions to it? How can I set a breakpoint (which I understand is a quite crucial point)? Can I use GDB with my software to help debug the processor and how do I do that?
Thank you in advance! /Kristofer Krus
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Quoted 10 lines · TriKri
I have an embedded system, a box, with a MIPS processor on it, which I need to debug (stop and start the processor, tell what instructions it has previously executed, etc.). I also have an EJTAG probe, which I have connected between the computer's usb and the box, and written software for it. The software can communicate with the probe, which in its own turn can communicate with the box through the tap (test access port), by giving the tap certain instructions. It can also, through the tap, feed the MIPS processor with instructions, and read/write data from processor registers.
Quoted 4 lines
The question is now, how can debug the processor? How do I stop it, do I have to send any certain instructions to it? How can I set a breakpoint (which I understand is a quite crucial point)? Can I use GDB with my software to help debug the processor and how do I do that?
I looked for Open Source EJTAG software a while ago and found two projects which may be of interest to you:
http://svn.berlios.de/svnroot/repos/openocd/branches/mips/
http://www.totalembedded.com/open_source/jtag/mips32_ejtag/
But I didn't try to use any of it so far.
Johannes