Subj : Re: Raspberry Debug Probe query
To   : Single Stage to Orbit
From : Theo
Date : Sat Jun 22 2024 17:28:29

Single Stage to Orbit <alex.buell@munted.eu> wrote:
> Does anyone knows how to use the Raspberry Debug Probe with a Raspberry
> Pi 3B? I've googled but the articles I've found only explains how to
> use it with Raspberry Picos. I have a tricky issue to diagnose and it
> needs hardware level debugging to see what's going wrong with it.

What do you want to debug?  The regular Pis have JTAG to which you can hook
up a debug probe and run something like OpenOCD+gdb on another machine (you
can likely do that from another Pi using GPIO, or a USB JTAG widget).  But
you're debugging the whole OS including all the daemons and whatnot that are
running on it.  Unless your issue is with the kernel itself (eg a boot
failure) or with some code running bare-metal, I don't think JTAG is going
to help much.

The Pico's Debug Probe provides SWD, which is for microcontrollers but not
for application-cores on the big Pis.  It provides 2 signal wires where JTAG
needs 4, so I don't think you could repurpose it for JTAG even if you wanted
to.

Theo

--- SoupGate-Win32 v1.05
 * Origin: Agency HUB, Dunedin - New Zealand | Fido<>Usenet Gateway (3:770/3)

.