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sipeed_tang_nano_4k: Minor cleanup/add comments.

This commit is contained in:
Florent Kermarrec 2024-01-02 13:42:56 +01:00
parent e585d786e9
commit 55ade3b2df
1 changed files with 22 additions and 15 deletions
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37
litex_boards/targets/sipeed_tang_nano_4k.py
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@ -53,10 +53,10 @@ class _CRG(LiteXModule):
self.cd_hdmi5x = ClockDomain() self.cd_hdmi5x = ClockDomain()
video_pll.create_clkout(self.cd_hdmi5x, 125e6) video_pll.create_clkout(self.cd_hdmi5x, 125e6)
self.specials += Instance("CLKDIV", self.specials += Instance("CLKDIV",
p_DIV_MODE= "5", p_DIV_MODE = "5",
i_RESETN = rst_n, i_RESETN = rst_n,
i_HCLKIN = self.cd_hdmi5x.clk, i_HCLKIN = self.cd_hdmi5x.clk,
o_CLKOUT = self.cd_hdmi.clk o_CLKOUT = self.cd_hdmi.clk,
) )
# BaseSoC ------------------------------------------------------------------------------------------ # BaseSoC ------------------------------------------------------------------------------------------
@ -85,23 +85,30 @@ class BaseSoC(SoCCore):
if self.cpu_type == 'vexriscv': if self.cpu_type == 'vexriscv':
assert self.cpu_variant == 'minimal', 'use --cpu-variant=minimal to fit into number of BSRAMs' assert self.cpu_variant == 'minimal', 'use --cpu-variant=minimal to fit into number of BSRAMs'
# Gowin EMCU Integration ------------------------------------------------------------------- # Gowin EMCU -------------------------------------------------------------------------------
if self.cpu_type == "gowin_emcu": if self.cpu_type == "gowin_emcu":
# Use EMCU's UART.
self.cpu.connect_uart(platform.request("serial")) self.cpu.connect_uart(platform.request("serial"))
# Use EMCU's SRAM.
self.bus.add_region("sram", SoCRegion( self.bus.add_region("sram", SoCRegion(
origin=self.cpu.mem_map["sram"], origin = self.cpu.mem_map["sram"],
size=16 * kB) size = 16 * kB,
) ))
# Use ECMU's FLASH as ROM.
self.bus.add_region("rom", SoCRegion( self.bus.add_region("rom", SoCRegion(
origin=self.cpu.mem_map["rom"], origin = self.cpu.mem_map["rom"],
size=32 * kB, size = 32 * kB,
linker=True) linker = True,
) ))
# No Gowin EMCU ----------------------------------------------------------------------------
else: else:
# Use SPI-Flash as ROM.
# SPI Flash ---------------------------------------------------------------------------- # SPI Flash ----------------------------------------------------------------------------
from litespi.modules import W25Q32 from litespi.modules import W25Q32
from litespi.opcodes import SpiNorFlashOpCodes as Codes from litespi.opcodes import SpiNorFlashOpCodes as Codes
self.add_spi_flash(mode="1x", module=W25Q32(Codes.READ_1_1_1), with_master=False) self.add_spi_flash(mode="1x", module=W25Q32(Codes.READ_1_1_1), with_master=False)
# Add ROM linker region ---------------------------------------------------------------- # Add ROM linker region ----------------------------------------------------------------
self.bus.add_region("rom", SoCRegion( self.bus.add_region("rom", SoCRegion(
origin = self.bus.regions["spiflash"].origin, origin = self.bus.regions["spiflash"].origin,
@ -143,9 +150,9 @@ class BaseSoC(SoCCore):
def main(): def main():
from litex.build.parser import LiteXArgumentParser from litex.build.parser import LiteXArgumentParser
parser = LiteXArgumentParser(platform=sipeed_tang_nano_4k.Platform, description="LiteX SoC on Tang Nano 4K.") parser = LiteXArgumentParser(platform=sipeed_tang_nano_4k.Platform, description="LiteX SoC on Tang Nano 4K.")
parser.add_target_argument("--flash", action="store_true", help="Flash Bitstream.") parser.add_target_argument("--flash", action="store_true", help="Flash Bitstream and BIOS.")
parser.add_target_argument("--sys-clk-freq",default=27e6, type=float, help="System clock frequency.") parser.add_target_argument("--sys-clk-freq", default=27e6, type=float, help="System clock frequency.")
parser.add_target_argument("--with-video-terminal",action="store_true", help="System clock frequency.") parser.add_target_argument("--with-video-terminal", action="store_true", help="Enable Video Terminal (HDMI).")
args = parser.parse_args() args = parser.parse_args()
soc = BaseSoC( soc = BaseSoC(