27 lines
985 B
Python
27 lines
985 B
Python
from migen.fhdl.std import *
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from misoclib import gpio, spiflash
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from misoclib.gensoc import GenSoC, IntegratedBIOS
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class SimpleSoC(GenSoC, IntegratedBIOS):
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def __init__(self, platform):
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GenSoC.__init__(self, platform,
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clk_freq=32*1000000,
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cpu_reset_address=0)
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IntegratedBIOS.__init__(self)
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# We can't use reset_less as LM32 does require a reset signal
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self.clock_domains.cd_sys = ClockDomain()
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self.comb += self.cd_sys.clk.eq(platform.request("clk32"))
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self.specials += Instance("FD", p_INIT=1, i_D=0, o_Q=self.cd_sys.rst, i_C=ClockSignal())
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self.submodules.leds = gpio.GPIOOut(platform.request("user_led"))
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# Map the SPI flash at 0xb0000000 for demo purposes. Later, we'll want to store the BIOS there.
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self.submodules.spiflash = spiflash.SpiFlash(platform.request("spiflash2x"),
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cmd=0xefef, cmd_width=16, addr_width=24, dummy=4)
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self.add_wb_slave(lambda a: a[26:29] == 3, self.spiflash.bus)
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def get_default_subtarget(platform):
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return SimpleSoC
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