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.
- 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
- Status: Not working (Broken Python development environment)
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 --initThis 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.
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.
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