45c45
< test_sys.iobridge = Bridge(delay='50ns', ranges = [AddrRange(0, '8GB')])
---
> test_sys.iobridge = Bridge(delay='50ns', ranges = test_sys.mem_ranges)
56c56
< drive_sys.iobridge = Bridge(delay='50ns', ranges = [AddrRange(0, '8GB')])
---
> drive_sys.iobridge = Bridge(delay='50ns', ranges = drive_sys.mem_ranges)