DTG Settings Changes - 2021.1 English

The following changes were made to the DTG settings:

• Provide the extra device tree path in petalinux-config > DTG Settings > Extra dts/dtsi files menu with absolute/full path to build as part of the device-tree and deploy into /boot/devicetree.
• Earlier petalinux-config > DTG settings > Devicetree flags used the CONFIG_SUBSYSTEM_DEVICETREE_FLAGS="-@" configuration. The new configuration is CONFIG_SUBSYSTEM_DEVICETREE_COMPILER_FLAGS="-@".