for S32G multicore (A53 and M7) boot demos, some published resources listed here:
1. GoldVIP - Boot and Partitioning (Automotive Software package manager- S32G2 - bundles and use cases - GoldVIP, once installed, refer to User Manuel chapter 4.2 deploy goldvip images and chapter 6. boot flow; and Developer's guide chapter 2.1 & 2.2), when you read the documentation, you can also refer to the video clips on GoldVIP traing academy - GoldVIP Get started
2. NXP reference software - Integration reference examples (Automotive Software package manager- S32G2 - bundles and use cases - Integration reference examples, once installed refer to documentation->release note and user manuals)
3. S32G2 traning academy - S32G2 boot overview
4. "Enabling Multicore application on S32G2 using S32G2 platform software integration - application note" : AN17350 (also provided associated AN13750SW)
5. "Automotive premium engineering service" : https://www.nxp.com/support/support/nxp-engineering-services/automotive-premium-services:AP-PREMIUM-..., you could find professional automotive engineering services/training offering from here.
6. contact your NXP local sales to seek further help.
hope that helps.
Albert