Syntacore RISC-V first stage bootloader

About

This package contains the Syntacore first stage bootloader (SCBL) for SCR SDK platforms.

Prerequisites

RISC-V GCC toolchain is required to compile the software. You can use pre-built binaries or build the toolchain from scratch.

Using pre-built binary tools

Pre-built RISC-V GCC toolchain and OpenOCD binaries are available to download from http://syntacore.com/page/products/sw-tools. Download the archive (.tar.gz for Linux, .zip for Windows) for your platform, extract the archive to your preferred directory and update the PATH environment variable as described in Set environment variables section.

Building tools from source

You can build the RISC-V toolchain from sources.

Build procedure is verified at the Ubuntu 14.04 LTS and Ubuntu 16.04 LTS distributions.

sudo apt-get install autoconf automake libmpc-dev libmpfr-dev libgmp-dev gawk bison flex texinfo libtool make g++ pkg-config libexpat1-dev zlib1g-dev
git clone https://github.com/riscv/riscv-gnu-toolchain.git
cd riscv-gnu-toolchain
git checkout a71fc539850f8dacf232fc580743b946c376014b
git submodule update --init --recursive
./configure --prefix=<YOUR_INSTALL_PATH> --enable-multilib
make

More detailed instructions on how to prepare and build the toolchain can be found in https://github.com/riscv/riscv-tools/blob/master/README.md.

Set environment variables

Add the <YOUR_INSTALL_PATH>/bin folder to the PATH environment variable:

export PATH=$PATH:<YOUR_INSTALL_PATH>/bin

Supported target platforms

Target name	Description	Clock, MHz	TCM	RAM
arty_scr1	Digilent Arty A7	25	64K	-
c10lp_refkit_scr1	Trenz C10LP Refkit	20	64K	32M
de10lite_scr1	Terasic DE10-lite	20	64K	64M
a5_scr1	Intel Arria V GX FPGA Starter Kit	30	128K	256M
nexys4ddr_scr1	Digilent Nexys 4 DDR	30	64K	128M

Build SCBL

We assume that the directory bin, where the riscv-gnu-toolchain compiler binary has been installed, is a part of the PATH environment variable.

To build SCBL execute:

$ make CROSS_COMPILE=riscv64-unknown-elf- PLATFORM=<target_platform>

After the build process complets the target SCBL's files are created in the top level source directory, named build.<target_platform>.