.. _SD.Kernel.DisplayConfigurationAndBringUp:

.. include:: /content/swdocs.rsts

.. spelling::
   Acer
   downscaling
   fbcon
   fbconsole
   Flatron
   num
   nvimp
   Viewsonic
   HDMI
   dts
   html
   hdmi
   tegra
   dcb
   readme
   txt
   devicetree
   Fb

Orin specific Display Configuration
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Update DCB blob for Custom Carrier Boards
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Display Control Block (DCB) describes the display outputs and their configurations on a
platform.
Refer to https://download.nvidia.com/open-gpu-doc/DCB/2/DCB-4.x-Specification.html for more
information about DCB.

The DCB blob is stored in platform specific dtsi files in the ``nvidia,dcb-image`` property under
the display node.
AGX Orin's DCB blob is in the tegra234-dcb-p3701-0000-a02-p3737-0000-a01.dtsi file.

dcb_tool:
#########
 
DCB blob is made up of hex values, which makes it difficult to decode/edit manually.
``dcb_tool`` helps parse DCB blob in dtsi file and also helps modify the values
of the fields in the DCB blob.
The ``dcb_tool`` is packaged in the ``<top>/Linux_for_Tegra/tools/dcb_tool/`` directory.


Refer to the ``<top>/Linux_for_Tegra/tools/dcb_tool/readme.txt`` file for more information about
the ``dcb_tool`` commands and their usage.

.. note::
   To update the DCB blob, users need to reflash the Orin platform.


Display Device Tree Parameters
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Refer to the ``<kernel-source-path>/nvidia/Documentation/devicetree/bindings/video/nvidia,tegra234-display.txt``
file from the source code for information about these parameters.

Known Limitations
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- **Seamless display**: This feature will be supported in future releases for DP and HDMI.
- **Fb Console**: Kernel frame buffer console is not supported currently. It will be supported along with the **Seamless display** feature.