Error: unrecognized opcode `fence.i'

[srsorry]

Hello.
When I build the rocket-tools prj by ./build, it return error with unrecognized opcode fence.i' on rocket.pk. The error information below： Removing existing riscv-pk/build directory Configuring project riscv-pk Building project riscv-pk ../dummy_payload/dummy_entry.S: Assembler messages: ../dummy_payload/dummy_entry.S:23: Warning: unterminated string; newline inserted ../dummy_payload/dummy_entry.S:24: Warning: unterminated string; newline inserted ../dummy_payload/dummy_entry.S:25: Warning: unterminated string; newline inserted ../dummy_payload/dummy_entry.S:26: Warning: unterminated string; newline inserted ../dummy_payload/dummy_entry.S:27: Warning: unterminated string; newline inserted ../dummy_payload/dummy_entry.S:28: Warning: unterminated string; newline inserted ../dummy_payload/dummy_entry.S:29: Warning: unterminated string; newline inserted ../machine/mentry.S: Assembler messages: ../machine/mentry.S:93: Error: unrecognized opcode fence.i'
gmake: *** [mentry.o] Error 1
gmake: *** Waiting for unfinished jobs....
../machine/flush_icache.c: Assembler messages:
../machine/flush_icache.c:4: Error: unrecognized opcode `fence.i'
gmake: *** [flush_icache.o] Error 1

[aswaterman]

Try configuring with --with-arch=rv64gc_zifencei (or whatever is appropriate for your target). More recent assemblers require the zifencei extension to be explicitly listed for the fence.i instruction to be available.

[srsorry]

THX
I use CC= CXX= build_project riscv-pk --prefix=$RISCV --host=riscv64-unknown-elf --with-arch=rv64gc_zifencei now.
But it seems not work.
The new error shows below:
cc1: error: -march=rv64gc_zifencei: unsupported ISA substring '_zifencei'

The full error :
Configuring project riscv-pk
Building project riscv-pk
cc1: error: -march=rv64gc_zifencei: unsupported ISA substring '_zifencei'
cc1: error: -march=rv64gc_zifencei: unsupported ISA substring '_zifencei'
cc1: error: -march=rv64gc_zifencei: unsupported ISA substring '_zifencei'
cc1: error: -march=rv64gc_zifencei: unsupported ISA substring '_zifencei'
cc1: error: -march=rv64gc_zifencei: unsupported ISA substring '_zifencei'
cc1: error: -march=rv64gc_zifencei: unsupported ISA substring '_zifencei'
cc1: error: -march=rv64gc_zifencei: unsupported ISA substring '_zifencei'
cc1: error: -march=rv64gc_zifencei: unsupported ISA substring '_zifencei'
cc1: error: -march=rv64gc_zifencei: unsupported ISA substring '_zifencei'
cc1: error: -march=rv64gc_zifencei: unsupported ISA substring '_zifencei'
gmake: *** [file.o] Error 1
gmake: *** Waiting for unfinished jobs....
gmake: *** [handlers.o] Error 1
gmake: *** [console.o] Error 1
cc1: error: -march=rv64gc_zifencei: unsupported ISA substring '_zifencei'
gmake: *** [elf.o] Error 1
gmake: *** [logo.o] Error 1
gmake: *** [dummy_payload.o] Error 1
gmake: *** [entry.o] Error 1
cc1: error: -march=rv64gc_zifencei: unsupported ISA substring '_zifencei'
cc1: error: -march=rv64gc_zifencei: unsupported ISA substring '_zifencei'
cc1: error: -march=rv64gc_zifencei: unsupported ISA substring '_zifencei'
cc1: error: -march=rv64gc_zifencei: unsupported ISA substring '_zifencei'
cc1: error: -march=rv64gc_zifencei: unsupported ISA substring '_zifencei'
cc1: error: -march=rv64gc_zifencei: unsupported ISA substring '_zifencei'
cc1: error: -march=rv64gc_zifencei: unsupported ISA substring '_zifencei'
cc1: error: -march=rv64gc_zifencei: unsupported ISA substring '_zifencei'
gmake: *** [syscall.o] Error 1
gmake: *** [frontend.o] Error 1
gmake: *** [usermem.o] Error 1
gmake: *** [mmap.o] Error 1
gmake: *** [f32_lt.o] Error 1
gmake: *** [f32_add.o] Error 1
gmake: *** [f32_eq.o] Error 1
gmake: *** [f32_div.o] Error 1
gmake: *** [f32_mul.o] Error 1
gmake: *** [dummy_entry.o] Error 1
gmake: *** [f32_lt_quiet.o] Error 1
gmake: *** [f32_sqrt.o] Error 1

[srsorry]

Maybe I need use other ISA.

[aswaterman]

It seems you are having some problems with your compiler. I’d help if I could, but since I can’t replicate your environment, it’s not practIcal for me to help.

While I understand your frustration, suggesting you’ll use another ISA isn’t going to get you better support. I encourage you to use whatever ISA best suits your needs.

[srsorry]

After I re-downloaded the whole project of rocket-tools and recompiled, the problem went away. So I'm also not sure where the problem is.
Anyway, thanks a lot for your help.

[gustad]

I just cloned ca6dc52 and did a ./build.sh which resulted in

../machine/flush_icache.c: Assembler messages:
../machine/flush_icache.c:4: Error: unrecognized opcode `fence.i', extension `zifencei' required
gmake: *** [Makefile:336: flush_icache.o] Error 1

[Shreesh-Kulkarni]

Try configuring with --with-arch=rv64gc_zifencei (or whatever is appropriate for your target). More recent assemblers require the zifencei extension to be explicitly listed for the fence.i instruction to be available.

This again leads to another error regarding the stubs-lp64.h file from the GNU compiler not being detected. This happens only when specific architectures configurations are used such as the --with arch as you said.
However, this issue is already solved, (although seems like a informal one) here : Issue:125. Just putting it out there for people who get this error.

[TT430]

Recompiling the riscv-gnu-toolchain with the flag "--with-arch=rv64gc_zfencei" may help. This issue appears to be caused by your assembler lacking support for the 'fence.i' instruction.