Aaeon UP Xtreme i11 Getting Started Manual page 36

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Note that Intel PT directs instruction trace data to system memory. Although highly

compact and efficient, we are not streaming over DCI to the host in this case; we buffer

the code execution data until the platform is halted, at which point SourcePoint uses

JTAG over DCI to collect the trace data out of system memory, reconstruct and display

it. JTAG operates at fairly low speeds, and for large buffer sizes the transfer of all that

data can be slow. It starts to become noticeable beyond a buffer size of 64kB. If you try

to collect 1GB of data from system memory over JTAG, you can enjoy a cup of coffee

and cake (or perhaps a full meal) while this is in process. SourcePoint will display as

Not Responding, and you'll get the "grey screen" if you're too persistent. SourcePoint

will eventually recover, but in the interest of time and frustration, it's probably best not to

try to save huge collections of instruction trace. Focus your debug efforts in the vicinity

of the bug.

SourcePoint Getting Started Guide – UP Xtreme i11

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