9.3. Hardware support for Context ID

A variable-length Context ID value is output whenever trace is enabled, and as part of the periodic synchronization packet. This enables the current Context ID value to be passed to the debugger. You can also filter out unwanted trace based on the current Context ID using programmable trigger resources.

To support tracing when only a partial binary image is available, the compression protocol maintains synchronization even as the ETM branches into unknown code regions. When the code jumps back into a region for which the code image is available trace is decompressable immediately.

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