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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. 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. 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`` * ``tec0117``
* ``tangnano`` * ``tangnano``
* ``tangnano4k`` * ``tangnano4k``
* ``tangnano9k``
* ``runber`` * ``runber``
Flash 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 It's possible to flash external SPI Flash (connected to MSPI) in bscan mode by using ``--external-flash`` instead of
``-f``. ``-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*).