This RFC patchseries adds initial LiteX RISC-V SoC support for barebox.
You can obtain this patchseries from github:
$ git clone -b 20190602.litex https://github.com/frantony/barebox
LiteX is a Migen-based System on Chip [1], supporting softcore VexRiscv CPU,
a 32-bits Linux Capable RISC-V CPU [2].
All the components used to create the LiteX SoC are open-source and
the flexibility of Spinal HDL/Migen allow targeting easily very various
FPGA devices/boards: Lattice, Altera, Xilinx, Microsemi FPGAs
with SDRAM/DDR/DDR2/DDR3/DDR4 RAMs, RMII/MII/RGMII/1000BASE-X Ethernet PHYs.
The LiteX SoC with VexRiscv CPU can be deployed on e.g. Digilent ARTY board [3]
or Terasic DE0-Nano board [4].
You can boot barebox from serial port using flterm [5]:, e.g.:
flterm --port /dev/ttyUSB0 --kernel <path_to_barebox.bin> --kernel-adr 0x40000000
TODO
====
* add pbl support for riscv barebox;
* add liteeth Ethernet core support [6] (tip: use ARTY board);
* fix issues (see the WIP commit);
* use barebox to start linux [2] and zephyr [7].
REFERENCES
==========
[1] https://github.com/enjoy-digital/litex
[2] https://github.com/enjoy-digital/linux-on-litex-vexriscv
[3] https://store.digilentinc.com/arty-a7-artix-7-fpga-development-board-for-makers-and-hobbyists/
[4] http://www.terasic.com.tw/cgi-bin/page/archive.pl?Language=English&No=593
[5] https://github.com/timvideos/flterm
[6] https://github.com/enjoy-digital/liteeth
[7] https://github.com/zephyrproject-rtos/zephyr/tree/master/boards/riscv32/litex_vexriscv
Antony Pavlov (4):
riscv: add initial LiteX SoC support
serial: add litex UART driver
WIP: make it work on litex
riscv: add litex_defconfig
arch/riscv/Kconfig | 6 +
arch/riscv/Makefile | 1 +
arch/riscv/boot/start.S | 2 -
arch/riscv/configs/litex_defconfig | 45 +++++++
arch/riscv/dts/litex-generic.dts | 17 +++
arch/riscv/dts/litex.dtsi | 36 +++++
arch/riscv/mach-litex/Kconfig | 11 ++
arch/riscv/mach-litex/Makefile | 3 +
arch/riscv/mach-litex/include/mach/debug_ll.h | 124 ++++++++++++++++++
common/bootm.c | 2 +
drivers/serial/Makefile | 1 +
drivers/serial/serial_litex.c | 99 ++++++++++++++
12 files changed, 345 insertions(+), 2 deletions(-)
create mode 100644 arch/riscv/configs/litex_defconfig
create mode 100644 arch/riscv/dts/litex-generic.dts
create mode 100644 arch/riscv/dts/litex.dtsi
create mode 100644 arch/riscv/mach-litex/Kconfig
create mode 100644 arch/riscv/mach-litex/Makefile
create mode 100644 arch/riscv/mach-litex/include/mach/debug_ll.h
create mode 100644 drivers/serial/serial_litex.c
--
2.20.1
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