TinyEMU RISC-V Buildroot

News

• 2018-10-20: added musl support for RISC-V 32 and 64 bits (from here)

Introduction

• RISC-V 32 bit and 64 bit support.
• Built-in RISC-V toolchain:
  • gcc 7.3.0
  • glibc 2.27 (riscv64), glibc 2.26 (riscv32) or musl
  • Linux 4.15 kernel headers
• Support to compile the toolchain for the target (RISC-V or x86). This feature was removed from the mainstream buildroot.
• Configuration examples with X Window and Mesa 3D support.
• Used to build the JSLinux RISC-V and x86 images.
• Originally based on the Sifive buildroot fork, branch sifive, 2016-07-09 00:12:09, commit 0fd471394450a4dfde0f21a7f7abe51be5800a3f.

Note: The development version of Buildroot now supports RISC-V 64, but it lacks 32 bit support and several other features from this buildroot port.

Download

Installation

1. Untar the buildroot-riscv-xxxx-yy-zz.tar.gz archive.
2. Copy the default RISC-V 64 or RISC-V 32 configuration:

         cp configs/riscv64_defconfig .config
       

   or

         cp configs/riscv32_defconfig .config
       

   (The X Window configurations used for JSLinux are available in riscv64_xwin_defconfig and riscv32_xwin_defconfig. More packages are enabled so the compilation is longer)
3. Edit the configuration and save it (you can change nothing as a first try):

         make menuconfig
       

4. Generate the image (it takes a few minutes with the default configuration):

         make
       

5. If you want to run the generated image with TinyEMU:
   • Download and compile TinyEMU.
   • Download and untar the diskimage-linux-riscv archive to get the BIOS, Linux kernels and TinyEMU example configurations.
   • In diskimage-linux-riscv, edit buildroot-riscv64.cfg (resp. buildroot-riscv32.cfg) to ensure that the generated Buildroot image path (rootfs.ext2) is correct.
   • Run TinyEMU:

               temu buildroot-riscv64.cfg
             

     or

               temu buildroot-riscv32.cfg
             

   • Log in as root with an empty password.