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doc: Gowin: adding a note on howto recover the jtag when JTAGSSEL_N is used as GPIO

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Gwenhael Goavec-Merou 2022-07-26 08:18:44 +02:00
parent 18a3f941e1
commit a7279e1dd5
2 changed files with 12 additions and 0 deletions
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6
doc/guide/troubleshooting.rst
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@ -8,3 +8,9 @@ I installed openFPGALoader but it says `command not found` when I try to launch
The correct spelling of the program is *openFPGALoader* with FPGA and the "L" of "Loader" in uppercase.
Ensure the spelling of the program is correct.
Gowin device could not communicate since last bitstream flashed. (issue [#206](https://github.com/trabucayre/openFPGALoader/issues/206))
==============================================================
Gowin's FPGA may fails to be detected if **JTAGSEL_N** (pin 08 for *GW1N-4K*) is used as a GPIO.
To recover you have to pull down this pin (before power up) to recover JTAG interface (*UG292 - JTAGSELL_N section*).

6
doc/vendors/gowin.rst vendored
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@ -32,6 +32,7 @@ where ``BOARD_NAME`` is:
* ``tec0117``
* ``tangnano``
* ``tangnano4k``
* ``tangnano9k``
* ``runber``
Flash
@ -53,3 +54,8 @@ where ``BOARD_NAME`` is:
It's possible to flash external SPI Flash (connected to MSPI) in bscan mode by using ``--external-flash`` instead of
``-f``.
.. NOTE::
Gowin's FPGA may fails to be detected if **JTAGSEL_N** (pin 08 for *GW1N-4K*) is used as a GPIO.
To recover you have to pull down this pin (before power up) to recover JTAG interface (*UG292 - JTAGSELL_N section*).