question: Is the prebuilt build support rv32IMAC ISA extension or just rv32imc?

[Saqlinahamad]

No description provided.

[stnolting]

Do you mean the prebuilt gcc toolchain from https://github.com/stnolting/riscv-gcc-prebuilt or the "prebuilt" FPGA processor setups from https://github.com/stnolting/neorv32/actions/workflows/Implementation.yml?

1. The prebuilt gcc toolchain supports all ISA extensions that were officially ratified in the specific GCC / binutils version. For example, https://github.com/stnolting/riscv-gcc-prebuilt/releases/tag/rv32i-2.0.0 supports all the ISA extensions in you have mentioned (i, m, a, c).
2. The prebuilt FPGA setups use different configuration options of the processor/CPU. The example setups that are used in the "implementation" GitHub workflow instantiate processor wrappers from rtl/templates/processor. Check out the according wrapper VHDL file there to see which CPU ISA extensions are enabled and which are not.

[Saqlinahamad]

I meant prebuilt gcc toolchain

[Saqlinahamad]

Thanks.