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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>
This commit is contained in:
Austin Seipp 2019-01-11 14:54:29 -06:00
parent fc71cadda4
commit 4900ebb693
1 changed files with 1 additions and 1 deletions
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scripts/icestorm/Makefile
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@ -4,7 +4,7 @@ TOOLCHAIN_PREFIX = riscv32-unknown-elf-
all: example.bin
firmware.elf: firmware.S firmware.c firmware.lds
$(TOOLCHAIN_PREFIX)gcc -Os -ffreestanding -nostdlib -o $@ firmware.S firmware.c \
$(TOOLCHAIN_PREFIX)gcc -march=rv32i -Os -ffreestanding -nostdlib -o $@ firmware.S firmware.c \
--std=gnu99 -Wl,-Bstatic,-T,firmware.lds,-Map,firmware.map,--strip-debug -lgcc
chmod -x $@