Am 29.09.2017 um 01:12 schrieb Antony Pavlov:
> Signed-off-by: Antony Pavlov <antonynpavlov@gmail.com>
> ---
>  Documentation/boards/riscv.rst | 110 +++++++++++++++++++++++++++++++++++++++++
>  1 file changed, 110 insertions(+)
> 
> diff --git a/Documentation/boards/riscv.rst b/Documentation/boards/riscv.rst
> new file mode 100644
> index 000000000..912f16786
> --- /dev/null
> +++ b/Documentation/boards/riscv.rst
> @@ -0,0 +1,110 @@
> +RISC-V
> +======
> +
> +At the moment only qemu emulator is supported (see https://github.com/riscv/riscv-isa-sim
> +for details).
> +
> +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 20170824.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
> +
> +  nmon> q
> +  
> +  copy loop done
> +  restarting...
> +  
> +  nmon> q
> +  Switch to console [cs0]
> +  
> +  
> +  barebox 2017.08.0-00102-g212af75153 #1 Mon Sep 4 20:54:31 MSK 2017
> +  
> +  
> +  Board: generic Erizo SoC board
> +  m25p80 m25p128@00: unrecognized JEDEC id bytes: 00,  0,  0
> +  m25p80 m25p128@00: probe failed: error 2
> +  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/ttyUSB1 115200
> +
> +Wait several munutes for 'nmon> ' prompt.
> +
> +Next, start barebox from DRAM:
> +
> +  nmon> g 80000000
> +
> +You should see one more 'nmon> ' prompt (this nmon runs from DRAM).
> +Exit nmon with 'q' command:
> +
> +  nmon> q
> +  Switch to console [cs0]
> +  
> +  
> +  barebox 2017.08.0-00102-g212af75153 #1 Mon Sep 4 20:54:31 MSK 2017
> +  
> +  
> +  Board: generic Erizo SoC board
> +  m25p80 m25p128@00: unrecognized JEDEC id bytes: 00,  0,  0
> +  m25p80 m25p128@00: probe failed: error 2

hmmm... not working example?

> +  malloc space: 0x80100000 -> 0x801fffff (size 1 MiB)
> +  running /env/bin/init...
> +  /env/bin/init not found
> +  barebox:/ 

some parts are missing in defconfig. Barebox shell can display hostname
and so on ;)
-- 
Regards,
Oleksij