# riscv-linux

**Repository Path**: cnrv-lowRISC/riscv-linux

## Basic Information

- **Project Name**: riscv-linux
- **Description**: No description available
- **Primary Language**: Unknown
- **License**: Not specified
- **Default Branch**: coredump
- **Homepage**: None
- **GVP Project**: No

## Statistics

- **Stars**: 0
- **Forks**: 0
- **Created**: 2017-05-19
- **Last Updated**: 2020-12-19

## Categories & Tags

**Categories**: Uncategorized

**Tags**: None

## README

Linux/RISC-V
================================================================================

This is a port of Linux kernel for the [RISC-V](http://riscv.org/)
instruction set architecture.
Development is currently based on the [3.14 longterm branch](
https://git.kernel.org/cgit/linux/kernel/git/stable/linux-stable.git/log/?h=linux-3.14.y).

Building the kernel image
--------------------------------------------------------------------------------

1. Fetch upstream sources and overlay the `riscv` architecture-specific
   subtree:

        $ curl https://www.kernel.org/pub/linux/kernel/v3.x/linux-3.14.15.tar.xz | tar -xJ
        $ cd linux-3.14.15
        $ git init
        $ git remote add origin git@github.com:ucb-bar/riscv-linux.git
        $ git fetch
        $ git checkout -f -t origin/master

1. Populate `./.config` with the default symbol values:

        $ make ARCH=riscv defconfig

1. Optionally edit the configuration via an ncurses interface:

        $ make ARCH=riscv menuconfig

1. Build the uncompressed kernel image:

        $ make ARCH=riscv -j vmlinux

1. Boot the kernel in the functional simulator, optionally specifying a
   raw disk image for the root filesystem:

        $ spike +disk=path/to/root.img vmlinux

Exporting kernel headers
--------------------------------------------------------------------------------

The `riscv-gcc` repository includes a copy of the kernel header files.
If the userspace API has changed, export the updated headers to the
`riscv-gcc` source directory:

    $ make ARCH=riscv headers_check
    $ make ARCH=riscv INSTALL_HDR_PATH=path/to/riscv-gcc/linux-headers headers_install

Rebuild `riscv-gcc` with the `linux` target:

    $ make INSTALL_DIR=path/to/install linux