Added build instructions for RV32I toolchain

This commit is contained in:
Clifford Wolf 2015-06-26 13:48:16 +02:00
parent f87d81287c
commit c06286423b
1 changed files with 30 additions and 0 deletions

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