How to simulate riscv32 on gem5?

When you look at https://github.com/gem5/gem5/blob/master/src/arch/riscv/types.hh,you can find out some riscv32 definitions. However, I use the gem5 default RISCV configuration and build a basic simulation with config/example/se.py. It only supports those binaries which build by riscv64-unknown-elf-gcc. Is gem5 support riscv32 (gem5 architecture support page is outdated link)? How to simulate riscv32 on gem5?