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SiFive Freedom Unleashed SDK

This builds a complete RISC-V cross-compile toolchain for the SiFive Freedom Unleashed U500 SoC. It also builds a bbl image for booting the Freedom Unleashed development board.

Tested Configurations

Ubuntu 16.04 x86_64 host

  • Status: Working
  • Build dependencies: build-essential git autotools texinfo bison flex libgmp-dev libmpfr-dev libmpc-dev gawk libz-dev libssl-dev python unzip libncurses5-dev
  • Additional build deps for QEMU: libglib2.0-dev libpixman-1-dev
  • Additional build deps for Spike: device-tree-compiler

Arch Linux x86_64 Host

  • Status: Not working (Broken Python development environment)

Build Instructions

Checkout this repository. Then you will need to checkout all of the linked submodules using:

$ git clone https://github.com/sifive/freedom-u-sdk.git
$ cd freedom-u-sdk
$ git submodule update --recursive --init

This will take some time and require around 7GB of disk space. Some modules may fail because certain dependencies don't have the best git hosting. The only solution is to wait and try again later (or ask someone for a copy of that source repository).

Once the submodules are initialized, run make and the complete toolchain and bbl image will be built. The completed build tree will consume about 14G of disk space.

Upgrading the BBL for booting the Freedom Unleashed dev board

Once the build of the SDK is complete, there will be a new bbl image under work/bbl.bin. This can be copied to the first partition of the MicroSD card using the dd tool.

Booting Linux on a simulator

You can boot linux on qemu by running make qemu.

You can boot linux on spike by running make sim. This requires a patch to enable the old serial driver, because the new one which works best on the Freedom Unleashed hardware unfortunately does not work on spike.

diff --git a/conf/linux_defconfig b/conf/linux_defconfig
index cd87340..87b480f 100644
--- a/conf/linux_defconfig
+++ b/conf/linux_defconfig
@@ -53,7 +53,7 @@ CONFIG_SERIAL_8250_CONSOLE=y
 CONFIG_SERIAL_OF_PLATFORM=y
 CONFIG_SERIAL_SIFIVE=y
 CONFIG_SERIAL_SIFIVE_CONSOLE=y
-# CONFIG_HVC_RISCV_SBI is not set
+CONFIG_HVC_RISCV_SBI=y
 CONFIG_VIRTIO_CONSOLE=y
 # CONFIG_HW_RANDOM is not set
 CONFIG_I2C=y