Dual in-line memory module map-out in an information handling system

A method, comprising:

• beginning, by a basic input/output system (BIOS), a system boot of an information handling system;
• performing, by the BIOS, a first memory reference code training;
• based on the first memory reference code training, discovering a bad dual in-line memory module (DIMM) of a plurality of DIMMs;
• storing information associated with the bad DIMM;
• rebooting the information handling system;
• during the reboot, retrieving the information associated with the bad DIMM;
• disabling a slot associated with the bad DIMM;
• in response to the slot being disabled, performing a second memory reference code training;
• and
• based on the second memory reference code training, downgrading a memory system to a closest possible DIMM population.

An information handling system, comprising:

• a plurality of dual in-line memory modules (DIMMs) forming a memory system of the information handling system;
• a multiple core processor to communicate with each of the DIMMs;
• a plurality of memory channels, wherein first and second ones of the DIMMs are configured to communicate with the multiple core processor via a first memory channel of the memory channels;
• and
• a basic input/output system (BIOS) to communicate with the DIMMs, the BIOS to:
• begin a system boot of the information handling system;
• perform a first memory reference code training;
• based on the first memory reference code training, discover a bad DIMM of the DIMMs;
• store information associated with the bad DIMM;
• set a reboot flag;
• based on the reboot flag being set, reboot the information handling system;
• during the reboot, retrieve the information associated with the bad DIMM;
• disable a slot associated with the bad DIMM;
• in response to the slot being disabled, perform a second memory reference code training;
• and
• based on the second memory reference code training, downgrade the memory system to a closest possible DIMM population.