$ pdm run ../Tests/test_pcie_serdes_x4.py run
Traceback (most recent call last):
  File "C:/msys2/home/yanla/ECP5-PCIe/Tests/test_pcie_serdes_x4.py", line 99, in <module>
    FPGA.VersaECP55GPlatform(toolchain="Trellis").build(SERDESTestbench(), do_program=True)
  File "C:/msys2/home/yanla/ECP5-PCIe/Gateware/.venv/lib/python3.11/site-packages/amaranth/build/plat.py", line 100, in build
    plan = self.prepare(elaboratable, name, **kwargs)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "C:/msys2/home/yanla/ECP5-PCIe/Gateware/.venv/lib/python3.11/site-packages/amaranth/build/plat.py", line 141, in prepare
    fragment = Fragment.get(elaboratable, self)
               ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "C:/msys2/home/yanla/ECP5-PCIe/Gateware/.venv/lib/python3.11/site-packages/amaranth/hdl/ir.py", line 37, in get
    new_obj = obj.elaborate(platform)
              ^^^^^^^^^^^^^^^^^^^^^^^
  File "C:/msys2/home/yanla/ECP5-PCIe/Tests/test_pcie_serdes_x4.py", line 31, in elaborate
    m.domains.rx = ClockDomain()
                   ^^^^^^^^^^^^^
  File "C:/msys2/home/yanla/ECP5-PCIe/Gateware/.venv/lib/python3.11/site-packages/amaranth/hdl/cd.py", line 57, in __init__
    if name.startswith("cd_"):
       ^^^^^^^^^^^^^^^
AttributeError: 'NoneType' object has no attribute 'startswith'