This page is to list kernel boot arguments related to the DRM KMS.


Table of Contents


Overview

Some kernel boot arguments can be used to change settings / behavior of the Xilinx DRM KMS drivers. This page is to capture and describe available parameters.

ZynqMP DisplayPort driver arguments

From 2018.1, the Xilinx DRM has switched to new driver architecture. This section is specific to ZynqMP DisplayPort driver based on the new driver architecture.


Xilinx DRM KMS boot arguments

The Xilinx DRM KMS drivers have some specific module parameters.

Other kernel boot arguments

The descriptions of generic kernel parameters can be found in Documentation/kernel-parameters.txt of the kernel source tree (kernel-parameters.txt) . The below captures some descriptions.



Usage
The arguments / parameters can be given in the kernel bootargs.
bootargs "drm.debug=0x2f drm_kms_helper.fbdev_emulation=false"
Those are available in sysfs as module parameters. Each will have different access permission. Ones with write permission can change.
cat /sys/module/drm/parameters/debug
echo 0x2f > /sys/module/drm/parameters/debug

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