Hello meng_li
Premium security chip” means that this S32G2 device can support the Premium Software which includes Premium Security with expanded security capabilities and Premium Safety, which includes the S32 Safety Software Framework for functional safety implementations and Structural Core Self Test (SCST) for the Cortex-A53 cores. See following documents for more information:
https://www.nxp.com/docs/en/brochure/S32GSWBROCHURE.pdf
https://www.nxp.com/docs/en/product-brief/HSEPB.pdf
It is necessary to select a model with security function for secure boot and secure JTAG function realization.
https://www.nxp.com/docs/en/product-brief/HSEPB.pdf
You don't need the S32G2 Premium Software for secure boot and secure JTAG.
Please contact your local NXP representative for more information about the S32G2 Premium Software.
Regards