Hello, @Abhiram_m_s
Thanks for the questions.
ROS is a set of software libs and tools which could be relatively easily deployed on Ubuntu, From the BSP UM, the release include the support for s32g399ardb3ubuntu, then the fsl-image-ubuntu-ros is supported.
The following commands may be useful to execute from your Yocto path to build the image:
. ./nxp-setup-alb.sh -m s32g399ardb3ubuntu
cd s32g399ardb3ubuntu
add the following to conf/local.conf:
UBUNTU_TARGET_VERSION = "20.04.1"
bitbake fsl-image-ubuntu-ros
Best Regards
Chenyin