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RISC-V
======
Running RISC-V barebox on qemu
------------------------------
Obtain RISC-V GCC/Newlib Toolchain,
see https://github.com/riscv/riscv-tools/blob/master/README.md
for details. The ``build.sh`` script from ``riscv-tools`` should
create toolchain.
Next compile qemu emulator::
$ git clone -b 20180409.erizo https://github.com/miet-riscv-workgroup/riscv-qemu
$ cd riscv-qemu
$ cap="no" ./configure \
--extra-cflags="-Wno-maybe-uninitialized" \
--audio-drv-list="" \
--disable-attr \
--disable-blobs \
--disable-bluez \
--disable-brlapi \
--disable-curl \
--disable-curses \
--disable-docs \
--disable-kvm \
--disable-spice \
--disable-sdl \
--disable-vde \
--disable-vnc-sasl \
--disable-werror \
--enable-trace-backend=simple \
--disable-stack-protector \
--target-list=riscv32-softmmu,riscv64-softmmu
$ make
Next compile barebox::
$ make erizo_generic_defconfig ARCH=riscv
...
$ make ARCH=riscv CROSS_COMPILE=<path to your riscv toolchain>/riscv32-unknown-elf-
Run barebox::
$ <path to riscv-qemu source>/riscv32-softmmu/qemu-system-riscv32 \
-nographic -M erizo -bios <path to barebox sources >/barebox.bin \
-serial stdio -monitor none -trace file=/dev/null
Switch to console [cs0]
barebox 2018.12.0-00148-g60e49c4e16 #1 Tue Dec 18 01:12:29 MSK 2018
Board: generic Erizo SoC board
malloc space: 0x80100000 -> 0x801fffff (size 1 MiB)
running /env/bin/init...
/env/bin/init not found
barebox:/
Running RISC-V barebox on DE0-Nano FPGA board
---------------------------------------------
See https://github.com/open-design/riscv-soc-cores/ for instructions
on DE0-Nano bitstream generation and loading.
Connect to board's UART with your favorite serial communication software
(e.g. minicom) and check 'nmon> ' prompt (nmon runs from onchip ROM).
Next close your communication software and use ./scripts/nmon-loader
to load barebox image into board's DRAM, e.g.
# ./scripts/nmon-loader barebox.erizo.nmon /dev/ttyUSB0 115200
Wait several munutes for 'nmon> ' prompt.
Next, start barebox from DRAM:
nmon> g 80000000
Switch to console [cs0]
barebox 2018.12.0-00148-g60e49c4e16 #1 Tue Dec 18 01:12:29 MSK 2018
Board: generic Erizo SoC board
malloc space: 0x80100000 -> 0x801fffff (size 1 MiB)
running /env/bin/init...
/env/bin/init not found
barebox:/
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