System and method for changing a particular system setting during a pre-extensible firmware interface initialization (PEI) phase based on a command from a PEI module (PEIM)

An information handling system, comprising:

• a processor to execute a GetVariable routine;
• a system setting store contained in firmware;
• a plurality of handoff blocks (HOBs) associated with a cache;
• an update request repository that includes entries containing a specification of a system setting and a value, the value included in one of the HOBs;
• and
• a Variable Services facility operable during a pre-extensible firmware interface initialization (PEI) phase of a boot flow, wherein the Variable Services facility includes the GetVariable routine configured to retrieve a value of a system setting from the update request repository during the PEI phase by:
• receiving a specification of a system setting;
• searching the update request repository for an entry with a specification of the system setting;
• when the search finds an entry with a specification of the system setting, returning a system setting value of the entry;
• and
• when the search does not find an entry with a specification of the system setting, returning a system setting value from the system setting store.

A non-transitory computer-readable medium including processor-readable instructions that are executable by a processor to perform a method, the method comprising:

• during a pre-extensible firmware interface initialization (PEI) phase of a boot flow at an information handling system:
• providing an update request repository that includes a plurality of entries, wherein each of the plurality of entries corresponds to a particular system setting and wherein a system setting value associated with each entry is included in a handoff block (HOB) of a plurality of HOBs associated with a cache;
• receiving a command from a PEI module (PEIM) indicating that a system setting value corresponding to a particular system setting is to be deleted;
• searching the update request repository for an entry that corresponds to the particular system setting based on the command;
• and
• when the update request repository does not include an entry that corresponds to the particular system setting:
• creating the entry for the particular system setting;
• and
• associating a delete flag with the entry.