Hi all, I'm trying to see if the FPU is working properly on my Rocket implementation. I have the simplest C code possible: *...* *float a=6; float b=2; printf("a/b = %f",a/b);* *...* When I try to run it in bare metal, it simply prints out "a/b = %f"! If I put %d instead of %f it writes 0 as a result of 6 divided by 2. That is a very strange behavior. I'm using this script to compile the C code: *riscv64-unknown-elf-gcc -static -Wa,-march=RVIMAFD -std=gnu99 -g -ffast-math -fno-common -fno-builtin-printf -I./driver -c ./driver/syscalls.c -o ./driver/syscalls.o* *riscv64-unknown-elf-gcc -static -Wa,-march=RVIMAFD -std=gnu99 -g -ffast-math -fno-common -fno-builtin-printf -I./driver -c ./driver/spi.c -o ./driver/spi.o* *riscv64-unknown-elf-gcc -static -Wa,-march=RVIMAFD -std=gnu99 -g -ffast-math -fno-common -fno-builtin-printf -I./driver -c ./driver/uart.c -o ./driver/uart.o* *riscv64-unknown-elf-gcc -static -Wa,-march=RVIMAFD -std=gnu99 -g -ffast-math -fno-common -fno-builtin-printf -I./driver -c ./driver/memory.c -o ./driver/memory.o* *riscv64-unknown-elf-gcc -static -Wa,-march=RVIMAFD -std=gnu99 -g -ffast-math -fno-common -fno-builtin-printf -I./driver -c ./driver/elf.c -o ./driver/elf.o* *riscv64-unknown-elf-gcc -static -Wa,-march=RVIMAFD -std=gnu99 -g -ffast-math -fno-common -fno-builtin-printf -I./driver -c ./driver/diskio.c -o ./driver/diskio.o* *riscv64-unknown-elf-gcc -static -Wa,-march=RVIMAFD -std=gnu99 -g -ffast-math -fno-common -fno-builtin-printf -I./driver -c ./driver/ff.c -o ./driver/ff.o* *riscv64-unknown-elf-gcc -static -Wa,-march=RVIMAFD -std=gnu99 -g -ffast-math -fno-common -fno-builtin-printf -I./driver -c ./driver/crt.S -o crt.o* *riscv64-unknown-elf-gcc -T ./driver/test.ld -static -Wa,-march=RVIMAFD -std=gnu99 -g -ffast-math -fno-common -fno-builtin-printf -I./driver -o hello.riscv hello.c ./driver/syscalls.o ./driver/spi.o ./driver/uart.o ./driver/memory.o ./driver/elf.o ./driver/diskio.o ./dri\* *ver/ff.o crt.o -nostdlib -nostartfiles -ffast-math -lc -lgcc* Is this correct? Thank you for your help, Francesco -- | Francesco Viggiano, Columbia University, Staff associate researcher at Computer Science Building | | Phone: +1 646-9829-535, Skype ID: francesco.vgg | | Department of Computer Science 1214 Amsterdam Avenue | | Columbia University Mail Code 0401 | New York, NY 10027-7003 |