Linux On Vega

Linux for VEGA is maintained at VEGA Software Repository /operating-systems/linux-on-vega. Only THEJAS64 supports Linux.

Install VEGA Linux Toolchain

VEGA Linux Toolchain contains necessary RISC-V Toolchains to compile C/C++ programs for Linux. To Install VEGA Linux Toolchain :

git clone https://gitlab.com/cdac-vega/operating-systems/linux-on-vega/linux-toolchains.git

Also add the toolchain path to .bashrc file.

Download Precompiled Linux Image

Precompiled Linux for VEGA is available at VEGA Software Repository. To download precompiled Linux,

git clone https://gitlab.com/cdac-vega/operating-systems/precompiled-images.git

Inside the precompiled-images directory, Linux directory contains precompiled linux image (bbl.bin) and device tree file (riscv.dts).

Uploading Linux image to board

• Reset Board and wait 3 seconds till board is ready for Ethernet mode.

• Copy bbl.bin and riscv.dts to vega-tools/utils/eth_transfer directory.

• Edit env.txt for sending two files. Refer sample env.txt :

  #
  # CBL environment file 
  # 
   
  #Number of files to send
  files=2
  
  #Addresses of corresponding files
  address1=0x80000000
  address2=0x8fff0000
  
  #Entrypoint of program to jump after download
  entrypoint=0x80000000
  
  #Device tree binary address
  dtbaddress=0x8fff0000
  
  #MAC address of board to set
  mac=aa:bb:cc:dd:ee:ff
  

• Now generate binary device tree file (riscv.dts) by,

  dtc -O dtb -o riscv.dtb riscv.dts
  

• Now upload Linux image to target board using send.sh script. To upload use

  ./send.sh bbl.bin riscv.dtb
  

Compiling Applications for Linux

To compile programs for Linux, use the VEGA Linux Toolchain. For example, to compile a C file sample.c,

riscv64-buildroot-linux-gnu-gcc sample.c -o smaple.out

To run this you have to send executable smaple.out to Linux running on board using scp.

Note

Before doing scp to Linux running on board, board should get a vaild IP, either dynamic IP using udhcpc command or static IP using ifconfig command.