Hi @Aravinthkumar,
I hope you are doing well
One can make a partition in emmc by the following method using yocto:
One can modify the below file and create a partition in the final 'wic' image.
The size for the partition can be set using the --size parameter, specified in MB.
Other parameters like filesystem and labels can also be set here.
i.e part /boot --source bootimg-partition --ondisk mmcblk --fstype=vfat --label boot --active --align 8192 --size 64
here, --size 64 refers to the size of the partition and
--fstype=vfat refers to the type of partition.
--label boot suggests the label of partition.
Thanks & Regards,
Sanket Parekh