From a7279e1dd5d271cce1f1bf687acb1c43906938c3 Mon Sep 17 00:00:00 2001 From: Gwenhael Goavec-Merou Date: Tue, 26 Jul 2022 08:18:44 +0200 Subject: [PATCH] doc: Gowin: adding a note on howto recover the jtag when JTAGSSEL_N is used as GPIO --- doc/guide/troubleshooting.rst | 6 ++++++ doc/vendors/gowin.rst | 6 ++++++ 2 files changed, 12 insertions(+) diff --git a/doc/guide/troubleshooting.rst b/doc/guide/troubleshooting.rst index 9e49558..6de9dc2 100644 --- a/doc/guide/troubleshooting.rst +++ b/doc/guide/troubleshooting.rst @@ -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*). diff --git a/doc/vendors/gowin.rst b/doc/vendors/gowin.rst index 7f88990..06794ff 100644 --- a/doc/vendors/gowin.rst +++ b/doc/vendors/gowin.rst @@ -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*).