An apparatus includes physical layer circuitry with lanes to couple the apparatus to endpoint devices. a first input/output (I/O) controller to couple a first processor to the physical layer circuitry, and a second I/O controller to couple a second processor to the physical layer circuitry. The first and second I/O controllers are compatible with a Peripheral Component Interconnect Express (PCIe)-based protocol. The apparatus also includes a flexible input/output adapter (FIA) coupling the first and second I/O controllers to the lanes. The FIA selectively assigns access to each lane of the lanes by either the first or second I/O controller. The apparatus also includes a power management controller (PMC) communicably coupled to the FIA. The PMC causes the FIA to dynamically assign access to at least one of the lanes by the first or second I/O controller without a reboot cycle.