From 4900ebb6938a7f1720bc5f765c1e7f31ffd35407 Mon Sep 17 00:00:00 2001 From: Austin Seipp Date: Fri, 11 Jan 2019 14:54:29 -0600 Subject: [PATCH] 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 --- scripts/icestorm/Makefile | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/scripts/icestorm/Makefile b/scripts/icestorm/Makefile index ea4efff..e2771b1 100644 --- a/scripts/icestorm/Makefile +++ b/scripts/icestorm/Makefile @@ -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 $@