mirror of https://github.com/YosysHQ/picorv32.git
scripts/icestorm: force -march=rv32i
The IceStorm example core doesn't include compressed instructions or the MULT extension; it is an rv32i core, not rv32i[m|c]. If the given riscv32 toolchain is not explicitly told to generate rv32i code for the firmware, it may generate invalid instructions which cause a trap during simulation or on the hardware itself (although CATCH_ILLINSN is set to zero in this case, too). Luckily, any rv32i* toolchain (rv32imc for example) can fit the bill here -- there's no use of libgcc or anything (which might introduce illegal instructions generated previously) so just forcing the compiler to generate the right code works nicely. Signed-off-by: Austin Seipp <aseipp@pobox.com>
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@ -4,7 +4,7 @@ TOOLCHAIN_PREFIX = riscv32-unknown-elf-
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all: example.bin
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firmware.elf: firmware.S firmware.c firmware.lds
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$(TOOLCHAIN_PREFIX)gcc -Os -ffreestanding -nostdlib -o $@ firmware.S firmware.c \
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$(TOOLCHAIN_PREFIX)gcc -march=rv32i -Os -ffreestanding -nostdlib -o $@ firmware.S firmware.c \
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--std=gnu99 -Wl,-Bstatic,-T,firmware.lds,-Map,firmware.map,--strip-debug -lgcc
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chmod -x $@
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