lab004 makefile error: unrecognized emulation mode

[marrrk]

hello, i've been working through the labs and i've encountered an error on lab004 that i'm not quite sure how to fix. when running the commands in step 2, i get the following error:

$ make all
 CC       main.o
 LD       firmware.elf
riscv64-unknown-elf-ld: unrecognised emulation mode: abi=ilp32
Supported emulations: elf64lriscv elf32lriscv
make: *** [Makefile:18: firmware.elf] Error 1

i've ensured that i'm using the compiler installed in litex_setup.py by running it with the argument --gcc=riscv and adding that bin folder produced to my path.

any help is greatly appreciated!

[Esteves4]

Hello,

me, @alexandrekj and @MCassidy2411 were having the same problem. We solved by changing a few things in the firmware/Makefile file.

Begining in line 17:

• we changed LD to CC
• the crt0.o is in the bios directory
• The Libc is also needed by the c-code
• The Libbase changed its name from -lbase-nofloat to -lbase

firmware.elf: $(OBJECTS)
    $(CC) $(LDFLAGS) \
        -T linker.ld \
        -N -o $@ \
         $(BUILD_DIR)/software/bios/crt0.o \
        $(OBJECTS) \
        -L$(BUILD_DIR)/software/libbase \
        -L$(BUILD_DIR)/software/libcompiler_rt \
        -L$(BUILD_DIR)/software/libc \
        -lbase -lcompiler_rt -lc
    chmod -x $@

[marrrk]

Hi, thanks for commenting! I too noticed a few of these things but was unable to fix it 100%. One solution I was exploring was compiling the crt0.S found in $(CPU_DIRECTORY) and using directly but that led to a different error. I am yet to deduce whether it is caused by the change or something else wrong with the toolchain.

Trying your fix, I discovered something. For some reason my copy of litex deletes the crt0.o file in the bios directory and so I get a file not found error. I tried building the SoC again and noticed the following output during the build process:

make: Entering directory '/home/markn/riscv/code/fpga_101-master/lab004/build/software/bios'
 CC       boot.o
 CC       cmd_bios.o
 CC       cmd_mem.o
 CC       cmd_boot.o
 CC       cmd_i2c.o
 CC       cmd_spiflash.o
 CC       cmd_litedram.o
 CC       cmd_liteeth.o
 CC       cmd_litesdcard.o
 CC       cmd_litesata.o
 CC       sim_debug.o
 CC       main.o
 CC       crt0.o
 CC       bios.elf
chmod -x bios.elf
 OBJCOPY  bios.bin
chmod -x bios.bin
python3 -m litex.soc.software.mkmscimg bios.bin --little
python3 -m litex.soc.software.memusage bios.elf /home/markn/riscv/code/fpga_101-master/lab004/build/software/bios/../include/generated/regions.ld riscv64-unknown-elf

ROM usage: 21.07KiB     (65.83%)
RAM usage: 1.60KiB  (20.02%)

rm crt0.o

Updating Litex doesn't change this. Currently, I'm looking for where to find/fix that.