Tested with:
./colorlight_5a_75b.py --cpu-type=picorv32 --uart-name=crossover --with-etherbone --csr-csv=csr.csv

Load with following script:
#!/usr/bin/env python3

# Load ---------------------------------------------------------------------------------------------

def load():
    import os
    f = open("openocd.cfg", "w")
    f.write(
"""
interface ftdi
ftdi_vid_pid 0x0403 0x6011
ftdi_channel 0
ftdi_layout_init 0x0098 0x008b
reset_config none
adapter_khz 25000
jtag newtap ecp5 tap -irlen 8 -expected-id 0x41111043
""")
    f.close()
    os.system("openocd -f openocd.cfg -c \"transport select jtag; init; svf soc_etherbonesoc_colorlight_5a_75b/gateware/top.svf; exit\"")
    exit()

if __name__ == "__main__":
    load()


Then start lxserver:
lxserver --udp

And run following script:

#!/usr/bin/env python3

import sys

from litex import RemoteClient

wb = RemoteClient()
wb.open()

# # #

while True:
    if wb.regs.uart_xover_rxempty.read() == 0:
        print(chr(wb.regs.uart_xover_rxtx.read()), end="")
        sys.stdout.flush()

# # #

wb.close()

Add Mimas A7 board support

aller/tagus/nereid: use crossover UART, rename SoC to PCIe SoC and pass soc_sdram_argdict to PCIeSoC

ADD: KX2 and DDR3 support

targets/de10lite: use external clock for sys directly

At the start output of the pll is not stabilized, which
caused malfunctions when used for sys clock domain.
Use AsyncResetSynchronizer to start clock domains
on pll locked signal.