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Get raw ETM data from uLink pro?

Hiya,

I have a uLink pro and can successfully see the instruction trace (derived from the ETM data) of a target in uVision in the Trace Data window. However, I'm interested in seeing the raw ETM data extracted from the target chip (i.e., A-sync and I-sync packets as defined in chapter 7 of infocenter.arm.com/.../IHI0014Q_etm_architecture_spec.pdf).

Is there any way to expose this information or infer it without error? If so, how?

Thanks so much!

Top replies

Westonsupermare Pier over 6 years ago in reply to Lovely Sidhu +1 suggested

There probably is a way to get to it. There seem to be a number of academic types who seem to be interested in it in recent months. You might need to find some more practically minded types. Segger has...

Parents

0 Andy Neil over 6 years ago

Googling "cmsis dap etm trace" found this:

https://github.com/TheShed/OpenOCD-CMSIS-DAP/blob/master/src/target/etm.c

/*
 * ARM "Embedded Trace Macrocell" (ETM) support -- direct JTAG access.
 *
 * ETM modules collect instruction and/or data trace information, compress
 * it, and transfer it to a debugging host through either a (buffered) trace
 * port (often a 38-pin Mictor connector) or an Embedded Trace Buffer (ETB).
 *
 * There are several generations of these modules.  Original versions have
 * JTAG access through a dedicated scan chain.  Recent versions have added
 * access via coprocessor instructions, memory addressing, and the ARM Debug
 * Interface v5 (ADIv5); and phased out direct JTAG access.
 *
 * This code supports up to the ETMv1.3 architecture, as seen in ETM9 and
 * most common ARM9 systems.  Note: "CoreSight ETM9" implements ETMv3.2,
 * implying non-JTAG connectivity options.
 *
 * Relevant documentation includes:
 *  ARM DDI 0157G ... ETM9 (r2p2) Technical Reference Manual
 *  ARM DDI 0315B ... CoreSight ETM9 (r0p1) Technical Reference Manual
 *  ARM IHI 0014O ... Embedded Trace Macrocell, Architecture Specification
 */

So maybe that's worth a look ... ?

Reply

0 Andy Neil over 6 years ago

Googling "cmsis dap etm trace" found this:

https://github.com/TheShed/OpenOCD-CMSIS-DAP/blob/master/src/target/etm.c

/*
 * ARM "Embedded Trace Macrocell" (ETM) support -- direct JTAG access.
 *
 * ETM modules collect instruction and/or data trace information, compress
 * it, and transfer it to a debugging host through either a (buffered) trace
 * port (often a 38-pin Mictor connector) or an Embedded Trace Buffer (ETB).
 *
 * There are several generations of these modules.  Original versions have
 * JTAG access through a dedicated scan chain.  Recent versions have added
 * access via coprocessor instructions, memory addressing, and the ARM Debug
 * Interface v5 (ADIv5); and phased out direct JTAG access.
 *
 * This code supports up to the ETMv1.3 architecture, as seen in ETM9 and
 * most common ARM9 systems.  Note: "CoreSight ETM9" implements ETMv3.2,
 * implying non-JTAG connectivity options.
 *
 * Relevant documentation includes:
 *  ARM DDI 0157G ... ETM9 (r2p2) Technical Reference Manual
 *  ARM DDI 0315B ... CoreSight ETM9 (r0p1) Technical Reference Manual
 *  ARM IHI 0014O ... Embedded Trace Macrocell, Architecture Specification
 */

So maybe that's worth a look ... ?

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