[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 #83 from Luke Kenneth Casson Leighton <lkcl at lkcl.net> ---
first step completed: stlinkv2 recognised.
https://git.libre-soc.org/?p=libresoc-litex.git;a=commitdiff;h=65d71761c76d5894f5570402bce8d25a38610afa

second step is to work out what the equivalent "jtag newtap" command
is to send a tap IDCODE and set it up with the right IR length (4)

however that's where "actual interaction" takes place to the ECP5
in order to get responses back, and confirm whether this is working.

this command however confirms, through debug logs, that it is successfully
interacting with the stlinkv2 and that it is doing so in JTAG mode:

    openocd -d -f openocd_stlinkv2.cfg

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