UEFI NVRAM - OSDev Wiki
Aug 10, 2017 · UEFI solves this problem. UEFI provides an extensible, standardised interface to access NVRAM variables - infact, it is one of the few runtime services that UEFI provides, indicating that the variables are not otherwise accessible to the OS. This means that at any point during the OS's execution, it can both get and set these variables.
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