$ wishbone-tool --serial /dev/cu.usbmodemE2C8A90C3 --server gdb --server wishbone --csr-csv csr.csv
INFO [wishbone_tool::bridge::uart] Re-opened serial device /dev/cu.usbmodemE2C8A90C3
INFO [wishbone_tool::server] accepting gdb connections on 127.0.0.1:3333
Error in Wishbone server: ConnectionClosed
ERROR [wishbone_tool::bridge::uart] serial port was closed: peek IoError(Custom { kind: TimedOut, error: "Operation timed out" }) @ 82003828
INFO [wishbone_tool::bridge::uart] Re-opened serial device /dev/cu.usbmodemE2C8A90C3
ERROR [wishbone_tool::bridge::uart] serial port was closed: peek IoError(Custom { kind: TimedOut, error: "Operation timed out" }) @ 82003828
INFO [wishbone_tool::bridge::uart] Re-opened serial device /dev/cu.usbmodemE2C8A90C3
Error in Wishbone server: ConnectionClosed