I am trying to select a bootloader for my s32k344 board. And, I need to customize this bootloader. Can you please suggest which bootloader is best for s32k344?
The Unified bootloader previously mentioned (no HSE is used), and there is support in HSE firmware. You can download HSE FW and HSE demo app, HSE OTADEMO for A/B Swap from S32K3 Standard Software -> S32K3 Reference Software packages.