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I have some custom boards with an ARM processor (marvell78100, armv5 compliant), some SDRAM and some Flash. I'm trying to investigate timings problem with the SDRAM, since it seems the layout was not done correctly, which causes program crashes on some boards, every couple of hours.

Unfortunately, it's a typical situation of heisenbug, where observing the bug makes it disappear: when I run the program on gdb with a peedi JTAG debugger, the amount of errors seems to be extremely reduced.

What is the speed of a program running in a JTAG debugger compared to the normal speed?

I think I could find this information in the specifications for the ARM JTAG debug cells, but I didn't manage to find those specs.

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Is this single-step, using software breakpoints, or hardware debug only? The first two will definitely slow it down. Does simply having the JTAG attached fix the bug? – pjc50 Apr 22 at 9:02
I use "continue" with gdb, no breakpoints or single stepping. Running the program this way "fixes" the bug as it apparently changes timings. – Étienne Apr 22 at 9:27

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