Hello,
I am a master student working on a program-tracing project on the
PandaBoard ES. I'm using the FlySwatter2 as an adapter. I'm now working on
implementing ETM/PTM support for OMAP4460 in OpenOCD.
I analyzed the *etm.c* file. After getting some knowledge about it, I tried
to figure out if there were differences between that implementation and the
PTM/PFT specification.
So far, I spotted the following differences:
- registers are quite similar (same addresses and names), however ETM
register have different sizes and PTM registers have a constant size of 32
bits. In practice they are still similar because, for instance,
*ETMTRIGGER* register which has 17 bits on ETM is a 32 bits register on
PTM with 15 bits reserved.
- PTM registers have different access permissions (e.g. read only, read
and write, write only).
- Type of access to ETM registers (scan chain 6 [
http://infocenter.arm.com/help/index.jsp?topic=/com.arm.doc.ddi0211k/Cacbjhfg.html])
is different from the way PTM access its registers (ADI version 5.0 as
recommended from ARM [
http://infocenter.arm.com/help/index.jsp?topic=/com.arm.doc.ihi0035b/BEIJDIJD.html
])
Giving this scenario, IMHO, it looks like I need to implement a *ptm.c* file
based on *etm.c*. Do you agree? Do you have any suggestion?
Since I've been struggling with the PandaBoard ES for quite a while, are
there any other recommended Android/Linux-friendly boards with better ETM
support already implemented in OpenOCD?
Best regards,
Rodrigo Santos
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