Hi,
It seems that not all MCUs have CST enabled, RT1170 seems using CST, you can refer to the link (i.MX RT1170 | Crossover MCU Family with Arm Cortex-M7 and Cortex-M4 Cores | NXP Semiconductors) and secure boot https://www.nxp.com/webapp/Download?colCode=AN13250 for more details.
Regards
Harvey