Lane reversal detection and bifurcation system

An information handling system (IHS), comprising:

• an interface that includes a plurality of lanes;
• a processing subsystem coupled to the interface;
• and
• a memory subsystem that is coupled to the processing subsystem and that includes instructions that, when executed by the processing subsystem, causes the processing subsystem to provide a Basic Input/Output System (BIOS) that is configured to:
• bifurcate the interface into a first root port and a second root port, wherein the first root port is coupled to a first subset of the plurality of lanes, and where the second root port is coupled to a second subset of the plurality of lanes;
• initialize an endpoint device that includes an endpoint interface that is coupled to the interface to establish a link between the endpoint device and the interface;
• detect an endpoint presence and a non-functional link at the first root port;
• detect an endpoint presence and a functional link at the second root port;
• and
• determine, in response to the detecting the endpoint presence and the non-functional link at the first root port and the detecting the endpoint presence and the functional link at the second root port, that the first subset of the plurality of lanes coupled to the endpoint device are subject to a lane reversal.

A method of detecting a lane reversal, comprising:

• bifurcating, by a Basic Input/Output System (BIOS), an interface having a plurality of lanes into a first root port and a second root port, wherein the first root port is coupled to a first subset of the plurality of lanes, and where the second root port is coupled to a second subset of the plurality of lanes;
• initializing, by the BIOS, an endpoint device that includes an endpoint interface that is coupled to the interface to establish a link between the endpoint device and the interface;
• detecting, by the BIOS, an endpoint presence and a non-functional link at the first root port;
• detecting, by the BIOS, an endpoint presence and a functional link at the second root port;
• and
• determining, by the BIOS and in response to the detecting the endpoint presence and the non-functional link at the first root port and the detecting the endpoint presence and the functional link at the second root port, that the first subset of the plurality of lanes coupled to the endpoint device are subject to a lane reversal.