75 lines
2.9 KiB
Python
Executable File
75 lines
2.9 KiB
Python
Executable File
#!/usr/bin/env python3
|
|
|
|
#
|
|
# This file is part of LiteX-Boards.
|
|
#
|
|
# Copyright (c) 2020 Florent Kermarrec <florent@enjoy-digital.fr>
|
|
# SPDX-License-Identifier: BSD-2-Clause
|
|
|
|
from migen import *
|
|
|
|
from litex.gen import *
|
|
|
|
from litex.build.io import CRG
|
|
|
|
from litex_boards.platforms import tinyfpga_bx
|
|
|
|
from litex.soc.integration.soc_core import *
|
|
from litex.soc.integration.soc import SoCRegion
|
|
from litex.soc.integration.builder import *
|
|
from litex.soc.cores.led import LedChaser
|
|
|
|
# BaseSoC ------------------------------------------------------------------------------------------
|
|
|
|
class BaseSoC(SoCCore):
|
|
def __init__(self, bios_flash_offset, sys_clk_freq=16e6, with_led_chaser=True, **kwargs):
|
|
platform = tinyfpga_bx.Platform()
|
|
|
|
# CRG --------------------------------------------------------------------------------------
|
|
self.crg = CRG(platform.request("clk16"))
|
|
|
|
# SoCCore ----------------------------------------------------------------------------------
|
|
# Disable Integrated ROM since too large for iCE40.
|
|
kwargs["integrated_rom_size"] = 0
|
|
SoCCore.__init__(self, platform, sys_clk_freq, ident="LiteX SoC on TinyFPGA BX", **kwargs)
|
|
|
|
# SPI Flash --------------------------------------------------------------------------------
|
|
from litespi.modules import AT25SF081
|
|
from litespi.opcodes import SpiNorFlashOpCodes as Codes
|
|
self.add_spi_flash(mode="1x", module=AT25SF081(Codes.READ_1_1_1), with_master=False)
|
|
|
|
# Add ROM linker region --------------------------------------------------------------------
|
|
self.bus.add_region("rom", SoCRegion(
|
|
origin = self.bus.regions["spiflash"].origin + bios_flash_offset,
|
|
size = 32 * KILOBYTE,
|
|
linker = True)
|
|
)
|
|
self.cpu.set_reset_address(self.bus.regions["rom"].origin)
|
|
|
|
# Leds -------------------------------------------------------------------------------------
|
|
if with_led_chaser:
|
|
self.leds = LedChaser(
|
|
pads = platform.request_all("user_led"),
|
|
sys_clk_freq = sys_clk_freq)
|
|
|
|
# Build --------------------------------------------------------------------------------------------
|
|
|
|
def main():
|
|
from litex.build.parser import LiteXArgumentParser
|
|
parser = LiteXArgumentParser(platform=tinyfpga_bx.Platform, description="LiteX SoC on TinyFPGA BX.")
|
|
parser.add_target_argument("--bios-flash-offset", default="0x50000", help="BIOS offset in SPI Flash.")
|
|
parser.add_target_argument("--sys-clk-freq", default=16e6, type=float, help="System clock frequency.")
|
|
args = parser.parse_args()
|
|
|
|
soc = BaseSoC(
|
|
bios_flash_offset = int(args.bios_flash_offset, 0),
|
|
sys_clk_freq = args.sys_clk_freq,
|
|
**parser.soc_argdict
|
|
)
|
|
builder = Builder(soc, **parser.builder_argdict)
|
|
if args.build:
|
|
builder.build(**parser.toolchain_argdict)
|
|
|
|
if __name__ == "__main__":
|
|
main()
|