#!/usr/bin/env python3 # This variable defines all the external programs that this module # relies on. lxbuildenv reads this variable in order to ensure # the build will finish without exiting due to missing third-party # programs. LX_DEPENDENCIES = ["riscv", "icestorm", "yosys"] # Import lxbuildenv to integrate the deps/ directory import lxbuildenv # Disable pylint's E1101, which breaks completely on migen #pylint:disable=E1101 #from migen import * from migen import Module, Signal, Instance, ClockDomain, If from migen.genlib.resetsync import AsyncResetSynchronizer from migen.fhdl.specials import TSTriple from migen.fhdl.structure import ClockSignal, ResetSignal, Replicate, Cat from litex.build.lattice.platform import LatticePlatform from litex.build.generic_platform import Pins, IOStandard, Misc, Subsignal from litex.soc.integration import SoCCore from litex.soc.integration.builder import Builder from litex.soc.integration.soc_core import csr_map_update from litex.soc.interconnect import wishbone from litex.soc.interconnect.csr import AutoCSR, CSRStatus, CSRStorage from valentyusb import usbcore from valentyusb.usbcore import io as usbio from valentyusb.usbcore.cpu import epmem, unififo, epfifo from valentyusb.usbcore.endpoint import EndpointType from lxsocsupport import up5kspram, spi_flash import argparse import os _io_evt = [ ("serial", 0, Subsignal("rx", Pins("21")), Subsignal("tx", Pins("13"), Misc("PULLUP")), IOStandard("LVCMOS33") ), ("usb", 0, Subsignal("d_p", Pins("34")), Subsignal("d_n", Pins("37")), Subsignal("pullup", Pins("35")), IOStandard("LVCMOS33") ), ("pmoda", 0, Subsignal("p1", Pins("28"), IOStandard("LVCMOS33")), Subsignal("p2", Pins("27"), IOStandard("LVCMOS33")), Subsignal("p3", Pins("26"), IOStandard("LVCMOS33")), Subsignal("p4", Pins("23"), IOStandard("LVCMOS33")), ), ("pmodb", 0, Subsignal("p1", Pins("48"), IOStandard("LVCMOS33")), Subsignal("p2", Pins("47"), IOStandard("LVCMOS33")), Subsignal("p3", Pins("46"), IOStandard("LVCMOS33")), Subsignal("p4", Pins("45"), IOStandard("LVCMOS33")), ), ("led", 0, Subsignal("rgb0", Pins("39"), IOStandard("LVCMOS33")), Subsignal("rgb1", Pins("40"), IOStandard("LVCMOS33")), Subsignal("rgb2", Pins("41"), IOStandard("LVCMOS33")), ), ("spiflash", 0, Subsignal("cs_n", Pins("16"), IOStandard("LVCMOS33")), Subsignal("clk", Pins("15"), IOStandard("LVCMOS33")), Subsignal("miso", Pins("17"), IOStandard("LVCMOS33")), Subsignal("mosi", Pins("14"), IOStandard("LVCMOS33")), Subsignal("wp", Pins("18"), IOStandard("LVCMOS33")), Subsignal("hold", Pins("19"), IOStandard("LVCMOS33")), ), ("spiflash4x", 0, Subsignal("cs_n", Pins("16"), IOStandard("LVCMOS33")), Subsignal("clk", Pins("15"), IOStandard("LVCMOS33")), Subsignal("dq", Pins("14 17 19 18"), IOStandard("LVCMOS33")), ), ("clk48", 0, Pins("44"), IOStandard("LVCMOS33")) ] _io_dvt = [ ("serial", 0, Subsignal("rx", Pins("C3")), Subsignal("tx", Pins("B3"), Misc("PULLUP")), IOStandard("LVCMOS33") ), ("usb", 0, Subsignal("d_p", Pins("A1")), Subsignal("d_n", Pins("A2")), Subsignal("pullup", Pins("A4")), IOStandard("LVCMOS33") ), ("led", 0, Subsignal("rgb0", Pins("A5"), IOStandard("LVCMOS33")), Subsignal("rgb1", Pins("B5"), IOStandard("LVCMOS33")), Subsignal("rgb2", Pins("C5"), IOStandard("LVCMOS33")), ), ("spiflash", 0, Subsignal("cs_n", Pins("C1"), IOStandard("LVCMOS33")), Subsignal("clk", Pins("D1"), IOStandard("LVCMOS33")), Subsignal("miso", Pins("E1"), IOStandard("LVCMOS33")), Subsignal("mosi", Pins("F1"), IOStandard("LVCMOS33")), Subsignal("wp", Pins("F2"), IOStandard("LVCMOS33")), Subsignal("hold", Pins("B1"), IOStandard("LVCMOS33")), ), ("spiflash4x", 0, Subsignal("cs_n", Pins("C1"), IOStandard("LVCMOS33")), Subsignal("clk", Pins("D1"), IOStandard("LVCMOS33")), Subsignal("dq", Pins("E1 F1 F2 B1"), IOStandard("LVCMOS33")), ), ("clk48", 0, Pins("F4"), IOStandard("LVCMOS33")) ] _io_hacker = [ ("serial", 0, Subsignal("rx", Pins("C3")), Subsignal("tx", Pins("B3"), Misc("PULLUP")), IOStandard("LVCMOS33") ), ("usb", 0, Subsignal("d_p", Pins("A4")), Subsignal("d_n", Pins("A2")), Subsignal("pullup", Pins("D5")), IOStandard("LVCMOS33") ), ("led", 0, Subsignal("rgb0", Pins("A5"), IOStandard("LVCMOS33")), Subsignal("rgb1", Pins("B5"), IOStandard("LVCMOS33")), Subsignal("rgb2", Pins("C5"), IOStandard("LVCMOS33")), ), ("spiflash", 0, Subsignal("cs_n", Pins("C1"), IOStandard("LVCMOS33")), Subsignal("clk", Pins("D1"), IOStandard("LVCMOS33")), Subsignal("miso", Pins("E1"), IOStandard("LVCMOS33")), Subsignal("mosi", Pins("F1"), IOStandard("LVCMOS33")), Subsignal("wp", Pins("F2"), IOStandard("LVCMOS33")), Subsignal("hold", Pins("B1"), IOStandard("LVCMOS33")), ), ("spiflash4x", 0, Subsignal("cs_n", Pins("C1"), IOStandard("LVCMOS33")), Subsignal("clk", Pins("D1"), IOStandard("LVCMOS33")), Subsignal("dq", Pins("E1 F1 F2 B1"), IOStandard("LVCMOS33")), ), ("clk48", 0, Pins("F4"), IOStandard("LVCMOS33")) ] _connectors = [] class _CRG(Module): def __init__(self, platform, use_pll): if use_pll: clk48_raw = platform.request("clk48") clk12_raw = Signal() clk48 = Signal() clk12 = Signal() # Divide clk48 down to clk12, to ensure they're synchronized. # By doing this, we avoid needing clock-domain crossing. clk12_counter = Signal(2) self.clock_domains.cd_sys = ClockDomain() self.clock_domains.cd_usb_12 = ClockDomain() self.clock_domains.cd_usb_48 = ClockDomain() self.clock_domains.cd_usb_48_raw = ClockDomain() platform.add_period_constraint(self.cd_usb_48.clk, 1e9/48e6) platform.add_period_constraint(self.cd_usb_48_raw.clk, 1e9/48e6) platform.add_period_constraint(self.cd_sys.clk, 1e9/12e6) platform.add_period_constraint(self.cd_usb_12.clk, 1e9/12e6) platform.add_period_constraint(clk48, 1e9/48e6) platform.add_period_constraint(clk48_raw, 1e9/48e6) self.reset = Signal() # POR reset logic- POR generated from sys clk, POR logic feeds sys clk # reset. self.clock_domains.cd_por = ClockDomain() reset_delay = Signal(14, reset=4095) self.comb += [ self.cd_por.clk.eq(self.cd_sys.clk), self.cd_sys.rst.eq(reset_delay != 0), self.cd_usb_12.rst.eq(reset_delay != 0), self.cd_usb_48.rst.eq(reset_delay != 0), # self.cd_usb_48_raw.rst.eq(reset_delay != 0), ] self.comb += self.cd_usb_48_raw.clk.eq(clk48_raw) self.comb += self.cd_usb_48.clk.eq(clk48) self.sync.usb_48_raw += clk12_counter.eq(clk12_counter + 1) self.comb += clk12_raw.eq(clk12_counter[1]) self.specials += Instance( "SB_GB", i_USER_SIGNAL_TO_GLOBAL_BUFFER=clk12_raw, o_GLOBAL_BUFFER_OUTPUT=clk12, ) platform.add_period_constraint(clk12_raw, 1e9/12e6) self.specials += Instance( "SB_PLL40_CORE", # Parameters p_DIVR = 0, p_DIVF = 3, p_DIVQ = 2, p_FILTER_RANGE = 1, p_FEEDBACK_PATH = "PHASE_AND_DELAY", p_DELAY_ADJUSTMENT_MODE_FEEDBACK = "FIXED", p_FDA_FEEDBACK = 15, p_DELAY_ADJUSTMENT_MODE_RELATIVE = "FIXED", p_FDA_RELATIVE = 0, p_SHIFTREG_DIV_MODE = 1, p_PLLOUT_SELECT = "SHIFTREG_0deg", p_ENABLE_ICEGATE = 0, # IO i_REFERENCECLK = clk12, # o_PLLOUTCORE = clk12, o_PLLOUTGLOBAL = clk48, #i_EXTFEEDBACK, #i_DYNAMICDELAY, #o_LOCK, i_BYPASS = 0, i_RESETB = 1, #i_LATCHINPUTVALUE, #o_SDO, #i_SDI, ) else: clk48_raw = platform.request("clk48") clk12_raw = Signal() clk48 = Signal() clk12 = Signal() self.clock_domains.cd_sys = ClockDomain() self.clock_domains.cd_usb_12 = ClockDomain() self.clock_domains.cd_usb_48 = ClockDomain() platform.add_period_constraint(self.cd_usb_48.clk, 1e9/48e6) platform.add_period_constraint(self.cd_sys.clk, 1e9/12e6) platform.add_period_constraint(self.cd_usb_12.clk, 1e9/12e6) platform.add_period_constraint(clk48, 1e9/48e6) self.reset = Signal() # POR reset logic- POR generated from sys clk, POR logic feeds sys clk # reset. self.clock_domains.cd_por = ClockDomain() reset_delay = Signal(13, reset=4095) self.comb += [ self.cd_por.clk.eq(self.cd_sys.clk), self.cd_sys.rst.eq(reset_delay != 0), self.cd_usb_12.rst.eq(reset_delay != 0), # self.cd_usb_48.rst.eq(reset_delay != 0), ] self.specials += Instance( "SB_GB", i_USER_SIGNAL_TO_GLOBAL_BUFFER=clk48_raw, o_GLOBAL_BUFFER_OUTPUT=clk48, ) self.comb += self.cd_usb_48.clk.eq(clk48) clk12_counter = Signal(2) self.sync.usb_48 += clk12_counter.eq(clk12_counter + 1) self.comb += clk12_raw.eq(clk12_counter[1]) platform.add_period_constraint(clk12_raw, 1e9/12e6) self.specials += Instance( "SB_GB", i_USER_SIGNAL_TO_GLOBAL_BUFFER=clk12_raw, o_GLOBAL_BUFFER_OUTPUT=clk12, ) self.comb += self.cd_sys.clk.eq(clk12) self.comb += self.cd_usb_12.clk.eq(clk12) self.sync.por += \ If(reset_delay != 0, reset_delay.eq(reset_delay - 1) ) self.specials += AsyncResetSynchronizer(self.cd_por, self.reset) class RandomFirmwareROM(wishbone.SRAM): """ Seed the random data with a fixed number, so different bitstreams can all share firmware. """ def __init__(self, size, seed=2373): def xorshift32(x): x = x ^ (x << 13) & 0xffffffff x = x ^ (x >> 17) & 0xffffffff x = x ^ (x << 5) & 0xffffffff return x & 0xffffffff def get_rand(x): out = 0 for i in range(32): x = xorshift32(x) if (x & 1) == 1: out = out | (1 << i) return out & 0xffffffff data = [] seed = 1 for d in range(int(size / 4)): seed = get_rand(seed) data.append(seed) wishbone.SRAM.__init__(self, size, read_only=True, init=data) class FirmwareROM(wishbone.SRAM): def __init__(self, size, filename): data = [] with open(filename, 'rb') as inp: data = inp.read() wishbone.SRAM.__init__(self, size, read_only=True, init=data) class Platform(LatticePlatform): default_clk_name = "clk48" default_clk_period = 20.833 gateware_size = 0x20000 def __init__(self, revision=None, toolchain="icestorm"): if revision == "evt": LatticePlatform.__init__(self, "ice40-up5k-sg48", _io_evt, _connectors, toolchain="icestorm") elif revision == "dvt": LatticePlatform.__init__(self, "ice40-up5k-uwg30", _io_dvt, _connectors, toolchain="icestorm") elif revision == "hacker": LatticePlatform.__init__(self, "ice40-up5k-uwg30", _io_hacker, _connectors, toolchain="icestorm") else: raise ValueError("Unrecognized reivsion: {}. Known values: evt, dvt".format(revision)) def create_programmer(self): raise ValueError("programming is not supported") class SBLED(Module, AutoCSR): def __init__(self, pads): rgba_pwm = Signal(3) self.dat = CSRStorage(8) self.addr = CSRStorage(4) self.ctrl = CSRStorage(4) self.specials += Instance("SB_RGBA_DRV", i_CURREN = self.ctrl.storage[1], i_RGBLEDEN = self.ctrl.storage[2], i_RGB0PWM = rgba_pwm[0], i_RGB1PWM = rgba_pwm[1], i_RGB2PWM = rgba_pwm[2], o_RGB0 = pads.rgb0, o_RGB1 = pads.rgb1, o_RGB2 = pads.rgb2, p_CURRENT_MODE = "0b1", p_RGB0_CURRENT = "0b000011", p_RGB1_CURRENT = "0b000001", p_RGB2_CURRENT = "0b000011", ) self.specials += Instance("SB_LEDDA_IP", i_LEDDCS = self.dat.re, i_LEDDCLK = ClockSignal(), i_LEDDDAT7 = self.dat.storage[7], i_LEDDDAT6 = self.dat.storage[6], i_LEDDDAT5 = self.dat.storage[5], i_LEDDDAT4 = self.dat.storage[4], i_LEDDDAT3 = self.dat.storage[3], i_LEDDDAT2 = self.dat.storage[2], i_LEDDDAT1 = self.dat.storage[1], i_LEDDDAT0 = self.dat.storage[0], i_LEDDADDR3 = self.addr.storage[3], i_LEDDADDR2 = self.addr.storage[2], i_LEDDADDR1 = self.addr.storage[1], i_LEDDADDR0 = self.addr.storage[0], i_LEDDDEN = self.dat.re, i_LEDDEXE = self.ctrl.storage[0], # o_LEDDON = led_is_on, # Indicates whether LED is on or not # i_LEDDRST = ResetSignal(), # This port doesn't actually exist o_PWMOUT0 = rgba_pwm[0], o_PWMOUT1 = rgba_pwm[1], o_PWMOUT2 = rgba_pwm[2], o_LEDDON = Signal(), ) class SBWarmBoot(Module, AutoCSR): def __init__(self): self.ctrl = CSRStorage(size=8) do_reset = Signal() self.comb += [ # "Reset Key" is 0xac (0b101011xx) do_reset.eq(self.ctrl.storage[2] & self.ctrl.storage[3] & ~self.ctrl.storage[4] & self.ctrl.storage[5] & ~self.ctrl.storage[6] & self.ctrl.storage[7]) ] self.specials += Instance("SB_WARMBOOT", i_S0 = self.ctrl.storage[0], i_S1 = self.ctrl.storage[1], i_BOOT = do_reset, ) class BBSpi(Module, AutoCSR): def __init__(self, platform, pads): self.reset = Signal() # self.rdata = Signal(32) # self.addr = Signal(24) # self.ready = Signal() # self.valid = Signal() # self.flash_csb = Signal() # self.flash_clk = Signal() # cfgreg_we = Signal(4) # cfgreg_di = Signal(32) # cfgreg_do = Signal(32) mosi_pad = TSTriple() miso_pad = TSTriple() cs_n_pad = TSTriple() clk_pad = TSTriple() wp_pad = TSTriple() hold_pad = TSTriple() self.do = CSRStorage(size=6) self.oe = CSRStorage(size=6) self.di = CSRStatus(size=6) # self.cfg = CSRStorage(size=8) # cfg_remapped = Cat(self.cfg.storage[0:7], Signal(7), self.cfg.storage[7]) # self.comb += self.reset.eq(0) # self.comb += [ # cfgreg_di.eq(Cat(self.do.storage, Replicate(2, 0), # Attach "DO" to lower 6 bits # self.oe.storage, Replicate(4, 0), # Attach "OE" to bits 8-11 # cfg_remapped)), # cfgreg_we.eq(Cat(self.do.re, self.oe.re, self.cfg.re, self.cfg.re)), # self.di.status.eq(cfgreg_do), # clk_pad.oe.eq(~self.reset), # cs_n_pad.oe.eq(~self.reset), # ] self.specials += mosi_pad.get_tristate(pads.mosi) self.specials += miso_pad.get_tristate(pads.miso) self.specials += cs_n_pad.get_tristate(pads.cs_n) self.specials += clk_pad.get_tristate(pads.clk) self.specials += wp_pad.get_tristate(pads.wp) self.specials += hold_pad.get_tristate(pads.hold) self.comb += [ mosi_pad.oe.eq(self.oe.storage[0]), miso_pad.oe.eq(self.oe.storage[1]), wp_pad.oe.eq(self.oe.storage[2]), hold_pad.oe.eq(self.oe.storage[3]), clk_pad.oe.eq(self.oe.storage[4]), cs_n_pad.oe.eq(self.oe.storage[5]), mosi_pad.o.eq(self.do.storage[0]), miso_pad.o.eq(self.do.storage[1]), wp_pad.o.eq(self.do.storage[2]), hold_pad.o.eq(self.do.storage[3]), clk_pad.o.eq(self.do.storage[4]), cs_n_pad.o.eq(self.do.storage[5]), self.di.status.eq(Cat(mosi_pad.i, miso_pad.i, wp_pad.i, hold_pad.i, clk_pad.i, cs_n_pad.i)), ] # self.specials += Instance("spimemio", # o_flash_io0_oe = mosi_pad.oe, # o_flash_io1_oe = miso_pad.oe, # o_flash_io2_oe = wp_pad.oe, # o_flash_io3_oe = hold_pad.oe, # o_flash_io0_do = mosi_pad.o, # o_flash_io1_do = miso_pad.o, # o_flash_io2_do = wp_pad.o, # o_flash_io3_do = hold_pad.o, # i_flash_io0_di = mosi_pad.i, # i_flash_io1_di = miso_pad.i, # i_flash_io2_di = wp_pad.i, # i_flash_io3_di = hold_pad.i, # i_resetn = ResetSignal() | self.reset, # i_clk = ClockSignal(), # i_valid = self.valid, # o_ready = self.ready, # i_addr = self.addr, # o_rdata = self.rdata, # i_cfgreg_we = cfgreg_we, # i_cfgreg_di = cfgreg_di, # o_cfgreg_do = cfgreg_do, # o_flash_csb = self.flash_csb, # o_flash_clk = self.flash_clk, # ) # platform.add_source("spimemio.v") class BaseSoC(SoCCore): csr_peripherals = [ "cpu_or_bridge", "usb", "bbspi", "reboot", "rgb", ] csr_map_update(SoCCore.csr_map, csr_peripherals) mem_map = { "spiflash": 0x20000000, # (default shadow @0xa0000000) } mem_map.update(SoCCore.mem_map) interrupt_map = { "usb": 3, } interrupt_map.update(SoCCore.interrupt_map) def __init__(self, platform, boot_source="rand", debug=False, bios_file=None, use_pll=True, **kwargs): # Disable integrated RAM as we'll add it later self.integrated_sram_size = 0 clk_freq = int(12e6) self.submodules.crg = _CRG(platform, use_pll=use_pll) SoCCore.__init__(self, platform, clk_freq, integrated_sram_size=0, with_uart=False, **kwargs) if debug: self.cpu.use_external_variant("2-stage-1024-cache-debug.v") from litex.soc.cores.uart import UARTWishboneBridge self.register_mem("vexriscv_debug", 0xf00f0000, self.cpu.debug_bus, 0x10) self.submodules.uart_bridge = UARTWishboneBridge(platform.request("serial"), clk_freq, baudrate=115200) self.add_wb_master(self.uart_bridge.wishbone) else: self.cpu.use_external_variant("2-stage-1024-cache.v") # SPRAM- UP5K has single port RAM, might as well use it as SRAM to # free up scarce block RAM. spram_size = 128*1024 self.submodules.spram = up5kspram.Up5kSPRAM(size=spram_size) self.register_mem("sram", 0x10000000, self.spram.bus, spram_size) if boot_source == "rand": kwargs['cpu_reset_address']=0 bios_size = 0x2000 self.submodules.random_rom = RandomFirmwareROM(bios_size) self.add_constant("ROM_DISABLE", 1) self.register_rom(self.random_rom.bus, bios_size) elif boot_source == "bios": kwargs['cpu_reset_address']=0 if bios_file is None: bios_size = 0x2000 self.add_memory_region("rom", kwargs['cpu_reset_address'], bios_size) else: bios_size = 0x2000 self.submodules.firmware_rom = FirmwareROM(bios_size, bios_file) self.add_constant("ROM_DISABLE", 1) self.register_rom(self.firmware_rom.bus, bios_size) elif boot_source == "spi": bios_size = 0x8000 kwargs['cpu_reset_address']=self.mem_map["spiflash"]+platform.gateware_size self.add_memory_region("rom", kwargs['cpu_reset_address'], bios_size) self.add_constant("ROM_DISABLE", 1) self.flash_boot_address = self.mem_map["spiflash"]+platform.gateware_size+bios_size self.add_memory_region("user_flash", self.flash_boot_address, # Leave a grace area- possible one-by-off bug in add_memory_region? # Possible fix: addr < origin + length - 1 platform.spiflash_total_size - (self.flash_boot_address - self.mem_map["spiflash"]) - 0x100) else: raise ValueError("unrecognized boot_source: {}".format(boot_source)) # Add a simple bit-banged SPI Flash module spi_pads = platform.request("spiflash") self.submodules.bbspi = BBSpi(platform, spi_pads) self.submodules.reboot = SBWarmBoot() self.submodules.rgb = SBLED(platform.request("led")) # Add USB pads usb_pads = platform.request("usb") usb_iobuf = usbio.IoBuf(usb_pads.d_p, usb_pads.d_n, usb_pads.pullup) self.submodules.usb = epfifo.PerEndpointFifoInterface(usb_iobuf, endpoints=[EndpointType.BIDIR]) # self.submodules.usb = epmem.MemInterface(usb_iobuf) # self.submodules.usb = unififo.UsbUniFifo(usb_iobuf) # Add "-relut -dffe_min_ce_use 4" to the synth_ice40 command. # The "-reult" adds an additional LUT pass to pack more stuff in, # and the "-dffe_min_ce_use 4" flag prevents Yosys from generating a # Clock Enable signal for a LUT that has fewer than 4 flip-flops. # This increases density, and lets us use the FPGA more efficiently. platform.toolchain.nextpnr_yosys_template[2] += " -dsp -relut -dffe_min_ce_use 5" # Disable final deep-sleep power down so firmware words are loaded # onto softcore's address bus. platform.toolchain.build_template[3] = "icepack -s {build_name}.txt {build_name}.bin" platform.toolchain.nextpnr_build_template[2] = "icepack -s {build_name}.txt {build_name}.bin" # # Add a "Multiboot" variant # platform.toolchain.nextpnr_build_template[3] = "icepack -s {build_name}.txt {build_name}-multi.bin" def make_multiboot_header(filename, boot_offsets=[160]): """ ICE40 allows you to program the SB_WARMBOOT state machine by adding the following values to the bitstream, before any given image: [7e aa 99 7e] Sync Header [92 00 k0] Boot mode (k = 1 for cold boot, 0 for warmboot) [44 03 o1 o2 o3] Boot address [82 00 00] Bank offset [01 08] Reboot [...] Padding (up to 32 bytes) Note that in ICE40, the second nybble indicates the number of remaining bytes (with the exception of the sync header). The above construct is repeated five times: INITIAL_BOOT The image loaded at first boot BOOT_S00 The first image for SB_WARMBOOT BOOT_S01 The second image for SB_WARMBOOT BOOT_S10 The third image for SB_WARMBOOT BOOT_S11 The fourth image for SB_WARMBOOT """ while len(boot_offsets) < 5: boot_offsets.append(boot_offsets[0]) with open(filename, 'wb') as output: for offset in boot_offsets: # Sync Header output.write(bytes([0x7e, 0xaa, 0x99, 0x7e])) # Boot mode output.write(bytes([0x92, 0x00, 0x00])) # Boot address output.write(bytes([0x44, 0x03, (offset >> 16) & 0xff, (offset >> 8) & 0xff, (offset >> 0) & 0xff])) # Bank offset output.write(bytes([0x82, 0x00, 0x00])) # Reboot command output.write(bytes([0x01, 0x08])) for x in range(17, 32): output.write(bytes([0])) def main(): make_multiboot_header("build/gateware/multiboot.bin", [160, 262144]) parser = argparse.ArgumentParser( description="Build Fomu Main Gateware") parser.add_argument( "--boot-source", choices=["spi", "rand", "bios"], default="rand", help="where to have the CPU obtain its executable code from" ) parser.add_argument( "--revision", choices=["dvt", "evt", "hacker"], required=True, help="build foboot for a particular hardware revision" ) parser.add_argument( "--bios", help="use specified file as a BIOS, rather than building one" ) parser.add_argument( "--with-debug", help="enable debug support", action="store_true" ) parser.add_argument( "--no-pll", help="disable pll (possibly improving timing)", action="store_false" ) parser.add_argument( "--export-random-rom-file", help="Generate a random ROM file and save it to a file" ) args = parser.parse_args() if args.export_random_rom_file is not None: size = 0x2000 def xorshift32(x): x = x ^ (x << 13) & 0xffffffff x = x ^ (x >> 17) & 0xffffffff x = x ^ (x << 5) & 0xffffffff return x & 0xffffffff def get_rand(x): out = 0 for i in range(32): x = xorshift32(x) if (x & 1) == 1: out = out | (1 << i) return out & 0xffffffff seed = 1 with open(args.export_random_rom_file, "w", newline="\n") as output: for d in range(int(size / 4)): seed = get_rand(seed) print("{:08x}".format(seed), file=output) return 0 compile_software = False if args.boot_source == "bios" and args.bios is None: compile_software = True cpu_variant = "min" debug = False if args.with_debug: cpu_variant = "debug" debug = True os.environ["LITEX"] = "1" # Give our Makefile something to look for platform = Platform(revision=args.revision) soc = BaseSoC(platform, cpu_type="vexriscv", cpu_variant=cpu_variant, debug=debug, boot_source=args.boot_source, bios_file=args.bios, use_pll=args.no_pll) builder = Builder(soc, output_dir="build", csr_csv="test/csr.csv", compile_software=compile_software) if compile_software: builder.software_packages = [ ("bios", os.path.abspath(os.path.join(os.path.dirname(__file__), "..", "sw"))) ] vns = builder.build() soc.do_exit(vns) if __name__ == "__main__": main()