doc: add initial doc for gd32vf103c_dlink board

Signed-off-by: Huaqi Fang <[email protected]>

doc/source/design/board/gd32vf103c_dlink.rst

@@ -0,0 +1,60 @@
+.. _design_board_gd32vf103c_dlink:
+
+GD32VF103C DLink Debugger
+=========================
+
+.. _design_board_gd32vf103c_dlink_overview:
+
+Overview
+--------
+
+This GD32VF103C DLink Debugger is used to debug Nuclei RISC-V CPU from Nuclei
+using **GD32VF103CVBT6** as main MCU.
+
+.. _figure_design_board_gd32vf103c_dlink_1:
+
+.. figure:: /asserts/images/gd32vf103c_dlink_board.jpg
+    :width: 80 %
+    :align: center
+    :alt: GD32VF103C DLink Debugger Board
+
+    GD32VF103C DLink Debugger Board
+
+Click https://github.com/nuclei-Software/nuclei-dlink to learn more about
+Nuclei DLink project.
+
+.. _design_board_gd32vf103c_dlink_setup:
+
+Setup
+-----
+
+
+.. _design_board_gd32vf103c_dlink_usage:
+
+How to use
+----------
+
+For **GD32VF103C DLink Debugger** board, the **DOWNLOAD** and **CORE** variables
+are fixed to ``flashxip`` and ``n205``.
+
+* You can find its linker script in ``SoC/gd32vf103/Board/gd32vf103c_dlink/Source/GCC/``
+
+  - ``gcc_gd32vf103_flashxip.ld``: Linker script file for ``DOWNLOAD=flashxip``
+
+* If you want to specify your own modified linker script, you can follow steps described in :ref:`develop_appdev_linkscript`
+* You can find its openocd configuration file in ``SoC/gd32vf103/Board/gd32vf103c_dlink/openocd_gd32vf103.cfg``
+
+To run this application in GD32VF103C DLink Debugger board in Nuclei SDK,
+you just need to use this **SOC** and **BOARD** variables.
+
+.. code-block:: shell
+
+    # Clean the application
+    make SOC=gd32vf103 BOARD=gd32vf103c_dlink clean
+    # Build the application
+    make SOC=gd32vf103 BOARD=gd32vf103c_dlink all
+    # Upload the application using openocd and gdb
+    make SOC=gd32vf103 BOARD=gd32vf103c_dlink upload
+    # Debug the application using openocd and gdb
+    make SOC=gd32vf103 BOARD=gd32vf103c_dlink debug
+

doc/source/design/board/index.rst

@@ -10,4 +10,5 @@ Board
    gd32vf103v_rvstar.rst
    gd32vf103v_eval.rst
    gd32vf103c_longan_nano.rst
+   gd32vf103c_dlink.rst
    gd32vf103c_t_display.rst

doc/source/develop/buildsystem.rst

@@ -513,6 +513,8 @@ Currently we support the following SoCs.
      - Reference
    * - gd32vf103v_rvstar
      - :ref:`design_board_gd32vf103v_rvstar`
+   * - gd32vf103c_dlink
+     - :ref:`design_board_gd32vf103c_dlink`
    * - gd32vf103v_eval
      - :ref:`design_board_gd32vf103v_eval`
    * - gd32vf103c_longan_nano