mirror of https://github.com/YosysHQ/picorv32.git
Added build instructions for RV32I toolchain
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README.md
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README.md
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@ -268,6 +268,36 @@ Example assembler code using the `custom0` mnemonic:
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| timer x1, x2 | custom0 1, 2, 0, 5 |
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Building a pure RV32I Toolchain:
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--------------------------------
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The default settings in the [riscv-tools](https://github.com/riscv/riscv-tools) build
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scripts will build a compiler, assembler and linker that can target any RISC-V ISA,
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but the libraries are built for RV32G and RV64G targets. Follow the instructions
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below to build a complete toolchain (including libraries) that target a pure RV32I
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CPU.
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The following commands will build the RISC-V gnu toolchain and libraries for a
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pure RV32I target, and install it in `/opt/riscv32i`:
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sudo mkdir /opt/riscv32i
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sudo chown $USER /opt/riscv32i
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git clone https://github.com/riscv/riscv-gnu-toolchain riscv-gnu-toolchain-rv32i
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cd riscv-gnu-toolchain-rv32i
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sed -i 's|--enable-languages|--with-arch=RV32I &|' Makefile.in
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sed -i 's|asm volatile|value = 0; // &|' newlib/newlib/libc/machine/riscv/ieeefp.c
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mkdir build; cd build
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../configure --with-xlen=32 --prefix=/opt/riscv32i
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make -j$(nproc)
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The commands will all be named using the prefix `riscv32-unknown-elf-`, which
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makes it easy to install them side-by-side with the regular riscv-tools, which
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are using the name prefix `riscv64-unknown-elf-` by default.
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Todos:
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------
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