SANTA CLARA, Calif. -- It's only the second day of tight end Vernon Davis' and tackle Alex Boone's holdout, yet San Francisco 49ers coach Jim Harbaugh appeared to be tiring of talking about the subject."To answer the three, four, five follow-up questions, it gets to be badgering," Harbaugh said. "It gets old. I covered it thoroughly yesterday. I don't feel like there is anything more to say about it at this time."Here are some other observations from Day 2 of minicamp:Rookies, running back Carlos Hyde and receiver Bruce Ellington, continued to shine in practice Wednesday.