HDL_workflow/microwatt.mdwn

   1 # Build instructions for Microwatt
   2
   3 WIP integrate from <https://libre-soc.org/irclog/%23libre-soc.2022-01-26.log.html>
   4
   5 * install verilator: <https://git.libre-soc.org/?p=dev-env-setup.git;a=blob;f=verilator-install;hb=HEAD>
   6 * install yosys <https://git.libre-soc.org/?p=dev-env-setup.git;a=blob;f=hdl-tools-yosys;hb=HEAD>
   7 * install ghdl-yosys-plugin
   8
   9 After installing ghdl-yosys-plugin use schroot to switch environment
  10
  11     schroot -c bullseye_ghdl
  12     git clone https://git.libre-soc.org/git/microwatt.git
  13     git checkout -b verilator_trace
  14     export FPGA_TARGET=verilator
  15     make microwatt-verilator
  16
  17 Then run the resulting binary
  18
  19     time ./microwatt-verilator
  20
  21 If everything works correcly it will print out an light bulb in ascii art
  22 with the message Microwatt, it works. On my ASUS KGPE D16 this takes
  23
  24      real       1m4.986s
  25      user       1m4.373s
  26      sys        0m0.013s
  27
  28 ## Building the kernel
  29 On a POWER9 there is no need to install gcc-powerpc64le-linux-gnu,
  30 you can omit CROSS_COMPILE and ARCH in this case
  31
  32         apt install gcc-powerpc64le-linux-gnu
  33         apt install flex bison lz4
  34         git clone -b microwatt-5.7 https://git.kernel.org/pub/scm/linux/kernel/git/joel/microwatt.git
  35         cd microwatt
  36         wget https://ftp.libre-soc.org/microwatt-linux-5.7.patch
  37         patch -p1 < microwatt-linux-5.7.patch
  38         wget http://ftp.libre-soc.org/rootfs.cpio
  39         CROSS_COMPILE="ccache powerpc64le-linux-gnu-" ARCH=powerpc make -j8 O=microwatt microwatt_defconfig
  40         CROSS_COMPILE="ccache powerpc64le-linux-gnu-" ARCH=powerpc make -j8 O=microwatt
  41
  42 This will produce a file
  43         microwatt/arch/powerpc/boot/dtbImage.microwatt
  44
  45 ## Building sdram_init.bin
  46 This needs gcc-powerpc64le-linux-gnu if cross compilation is used.
  47
  48         cd microwatt
  49         cd litedram/gen-src/sdram_init/
  50         make
  51
  52 ## Building microwatt-verilator using the libre-soc core
  53         cd /path/to/soc
  54         make microwatt_external_core
  55         cp external_core_top.v /path/to/microwatt
  56         cd /path/to/microwatt
  57         export FPGA_TARGET=verilator
  58         export GHDLSYNTH=ghdl
  59         make microwatt-verilator
  60
  61 ## Running the simulation
  62         cp microwatt/arch/powerpc/boot/dtbImage.microwatt
  63         ./microwatt-verilator sdram_init.bin dtbImage.microwatt
  64
  65 ## TODO: buildroot
  66
  67 * https://github.com/shenki/buildroot/commits/microwatt
  68 * https://codeconstruct.com.au/docs/microwatt-orangecrab/