Here’s a bit more from chapter 8 of Augustine’s Exposition on Psalm 99:
“O magnify the Lord our God” (ver. 5). Magnify Him truly, magnify Him well. Let us praise Him, let us magnify Him who hath wrought the very righteousness which we have; who wrought it in us, Himself. For who but He who justified us, wrought righteousness in us? For of Christ it is said, “who justifieth the ungodly.” . . . “And fall down before His footstool: for He is holy.” What are we to fall down before? His footstool. What is under the feet is called a footstool, in Greek upopodion, in Latin Scabellum or Suppedaneum. But consider, brethren, what he commandeth us to fall down before. In another passage of the Scriptures it is said, “The heaven is My throne, and the earth is My footstool.” Doth he then bid us worship the earth, since in another passage it is said, that it is God’s footstool? How then shall we worship the earth, when the Scripture saith openly, “Thou shalt worship the Lord thy God”? Yet here it saith, “fall down before His footstool:” and, explaining to us what His footstool is, it saith, “The earth is My footstool.” I am in doubt; I fear to worship the earth, lest He who made the heaven and the earth condemn me; again, I fear not to worship the footstool of my Lord, because the Psalm biddeth me, “fall down before His footstool.” I ask, what is His footstool? and the Scripture telleth me, “the earth is My footstool.” In hesitation I turn unto Christ, since I am herein seeking Himself: and I discover how the earth may be worshipped without impiety, how His footstool may be worshipped without impiety. For He took upon Him earth from earth; because flesh is from earth, and He received flesh from the flesh of Mary. And because He walked here in very flesh, and gave that very flesh to us to eat for our salvation; and no one eateth that flesh, unless he hath first worshipped: we have found out in what sense such a footstool of our Lord’s may be worshipped, and not only that we sin not in worshipping it, but that we sin in not worshipping.
Could this passage be written by someone who has Calvin’s understanding of the Real Presence? It seems to me that Augustine is here talking of Eucharistic Adoration. How could he possibly speak of Adoring the Eucharist, if the Eucharist is not literally our Lord?