[Macchiato] JTAG debugging a Macchiato

[Frederik Lotter]

On Tue, Mar 20, 2018 at 8:03 PM, Matt Sealey <neko at bakuhatsu.net> wrote:

> Hello all,
>
> Anyone got *any* kind of JTAG debugger working with a Macchiato yet?
>
> I was unpleasantly surprised that the EspressoBIN works out of the box,
> but my McBIN seems to present me only with a single TAP with a strange (not
> Marvell?) JEP106 vendor and the product ID 0x8040 - that’s no Coresight DAP
> I’ve ever seen...
>
> Is there some lockout that should not have been placed or something the PM
> firmware running on the M3 could do to give us actual debug access (or
> could I short a test pad, flip a switch or just forget it and use the damn
> thing as a doorstop?)
>
> Marvell are being their usual selves regarding any information and
> documentation, so I’m putting it out here.
>
> Ta,
> Matt
>

I've asked the same question before.

ARM (DS-5) did not have debug support. I did not check any further.

The JTAG device you see is some proprietary TAP router device that needs
special sequences to wire/route in the Coresight DAP. Unfortunately these
codes are not publicly available as far as I know.


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