"If software clears the PS (page size) bit in a present PDE (page directory
entry), that will cause linear addresses mapped through this PDE to use
4-KByte pages instead of using a large page after old TLB entries are
invalidated. Due to this erratum, if a code fetch uses this PDE before the
TLB entry for the large page is invalidated then it may fetch from a different
physical address than specified by either the old large page translation or
the new 4-KByte page translation. This erratum may also cause speculative code
fetches from incorrect addresses."