I am currently implementing the Texas Instruments XDS110 debug probe in
OpenOCD. The firmware of this probe includes APIs to read and write memory via
the target's DAP for ARM Cortex based devices. The OpenOCD software stack does
not appear to support this and only can execute DAP register transactions via
the probe.
Any ideas on how best to implement this feature from within OpenOCD? The
performance gains are huge for this probe. We see almost 40x improvement
between the CMSIS-DAP interface vs using our built-in memory calls on the
XDS110.
The memory calls within the ARM Cortex architecture code would need to check if
the probe supports direct memory calls then route the call to be handled
entirely by the probe firmware. Otherwise, it could continue on to do the
memory transaction via DAP register calls.
Edward Fewell
Texas Instruments, Inc
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