The upcoming Broadway revival of “Death of a Salesman” — much-discussed but not previously locked in — has at last pulled the trigger, setting a March opening at the Ethel Barrymore Theater.Philip Seymour Hoffman, Linda Emond and Andrew Garfield all remain on board the long-gestating project, to be helmed by Mike Nichols. Cast will also include Finn Wittrock (“All My Children”), Fran Kranz (“Dollhouse”), John Glover, Bill Camp, Glenn Fleshler and Stephanie Janssen. Set will recreate the original design by the late Jo Mielziner, with costumes by Ann Roth, lights by Brian MacDevitt and sound by Scott Lehrer. Roth and MacDevitt previously teamed on the design team of “The Book of Mormon.” Hoffman will play the titular salesman in Arthur Miller’s 1949 drama, with Emond cast as his wife and Garfield playing son Biff. Wittrock has been cast as Biff’s brother Happy. Nichols’ most recent Rialto credit was 2008 play “The Country Girl.” Perennial legit title “Death of a Salesman” was last seen on Broadway in a 1999 Brian Dennehy-toplined revival that scored four Tonys. Latest incarnation of “Salesman” begins previews Feb. 13 ahead of a March 15 opening. The venue’s current tenant, “An Evening With Patti LuPone and Mandy Patinkin,” wraps its limited run there Jan. 13.