Yeah, that was the case.

I changed the toolchain to aarch64-linux-gnu, everything works fine.

My mistake was downloading a toolchain for the Cortex-RM processors.

Guess It’s solved now.

I'm unable to compile using arm-none-eabi-gcc toolchain. The error I get is: boot.S: Assembler messages: boot.S:7: Error: ARM register expected -- `mrs x0,mpidr_el1' boot.S:8: Error: ARM register expected -- `and x0,x0,#0xFF' boot.S:9: Error: selected processor does not support `cbz x0,master' in AR...