[Libre-soc-bugs] [Bug 517] Define JTAG pins and set up with litex for ulx3s85f

[bugzilla-daemon at libre-soc.org]

https://bugs.libre-soc.org/show_bug.cgi?id=517

--- Comment #74 from Cole Poirier <colepoirier at gmail.com> ---
(In reply to Luke Kenneth Casson Leighton from comment #72)
> https://github.com/arduino/OpenOCD/blob/master/tcl/interface/stlink-v2.cfg
> 
> that's how to tell openocd to use an stlinkv2.  trying to use this file:
> https://git.libre-soc.org/?p=libresoc-litex.git;a=blob;f=openocd.cfg;hb=HEAD
> 
> clearly isn't going to work, because, obviously, right at the start, it
> says, "connect to jtagremote" not "connect to stlinkv2".

It seems like the stlink-v2 only works with stm8 and stm32 microcontrollers. 

Apparently there is a way to setup jtag over gpio pins but I do not know what
JTAG adapter supports this. 

Do you know of a jtag usb adapter that supports softcore targets?

Can you comment as to what your progress on JTAG is?

Is your jtag boundary scan work related to this? 

I've banged my head against this for weeks and I think I've finally figured out
that there's a lot more involved here than setting up the pins (as we did on
the wiki) plugging it all in and running the *buspirate (debug adapter)
specific* demo from staf's retrouc gitlab repository. Any insight you can
provide here would be most helpful.

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