Supported Board: Main Readme Update

* Supported boards Main readme updated for new contents.
* build-open-harmony modified to include cross-reference syntax
* Signed-off-by: Arul Kumaran <arulkumaran.devarajan@huawei.com>

documentation/source/quick-start/build-open-harmony.rst

@@ -112,6 +112,8 @@ You can use the following syntax to build the OHOS flavour of your choice.
 
      $ MACHINE=<target_machine> bitbake <image-name>
 
+.. _linux_flavour:
+
 OHOS Linux flavour
 ====================
 
@@ -192,6 +194,8 @@ or close qemu using key combination:
 
 **Ctrl-A** followed by 'x'
 
+.. _zephyr_flavour:
+
 OHOS Zephyr flavour
 ====================
 
@@ -247,6 +251,8 @@ To exit qemu, use key combination:
 
 **Ctrl-A** followed by 'x'
 
+.. _freertos_flavour:
+
 OHOS FreeRTOS flavour
 ======================
 

documentation/source/supported-boards/Readme.rst

@@ -5,7 +5,7 @@
 Supported Boards
 ################
 
-|main_project_name| supports the following boards:
+|main_project_name| project developers are continually adding board-specific support. Currently, you can build an |main_project_name| image using your preferred OS flavour using the supported boards. Currently, |main_project_name| supports the following boards:
 
 .. toctree::
    :maxdepth: 1
@@ -14,5 +14,17 @@ Supported Boards
    96b-nitrogen
    seco-intel-b68
    seco-imx8mm-c61
-   
-   
+
+|main_project_name| is a distributed OS that is designed to run on top of a variety of OS kernels ranging from Linux to RTOSs. |main_project_name| uses notion of kernel specific flavours with predefined IMAGES and MACHINES:
+
+* :ref:`linux_flavour`
+* :ref:`zephyr_flavour`
+* :ref:`freertos_flavour`
+
+For more detailed information of kernel specific flavours, see `Getting Started <https://git.ostc-eu.org/OSTC/OHOS/docs/developer-guide/-/blob/master/documentation/source/quick-start/build-open-harmony.rst>`_.
+
+.. note:: 
+
+   A single board can be included in more than one flavour only when it has **well-maintained support** in targeted kernels.
+
+