- [x] Implement `startup_mimxrt1064.S`, linker script with IVT/FCB sections, and `tx_initialize_low_level.S`. - [x] Bring up LPUART1 serial output and verify ThreadX task switching (threads + timer) in Renode.
startup_mimxrt1064.S, linker script with IVT/FCB sections, andtx_initialize_low_level.S.