Intel 64 and IA-32 Architectures Software Developers Manual Volume 3A, System Programming Guide, Part 1

Vol. 3A 9-55
PROCESSOR MANAGEMENT AND INITIALIZATION
}
If (INVALID_REVISION) returned
{
Display Message: More recent update already loaded in NVRAM for
this stepping
continue
}
If any other error returned
{
Display Diagnostic
exit
}
//
// Verify the update was loaded correctly
//
Issue the ReadUpdate function
If an error occurred
{
Display Diagnostic
exit
}
//
// Compare the Update read to that written
//
If (Update read != Update written)
{
Display Diagnostic
exit
}
I ← I + (size of microcode update / 2048)
}
//
// Enable Update Loading, and inform user
//
Issue the Update Control function with Task = Enable.