Hi there Victor, welcome to planDisney!
It sounds like you’ve managed to snag some early reservations to have breakfast around
Disney’s BoardWalk, which is always a great idea to do before a big day at the theme parks! You've probably got reservations to
Trattoria al Forno (which is currently the only location on Disney's BoardWalk where you can make book a breakfast seating) and I sometimes find myself dreaming of
their Sunrise Breakfast Pizza or their Caprese Omelet on the menu.
On the bright side, by showing your reservation at the gate you'll be permitted entry to park at
Disney's BoardWalk Inn, which has become stricter about preventing anyone without a room or dining reservation to enter in the morning (as a measure to avoid folks just attempting to leave their vehicles for the day to enter the theme parks and using spaces designated for guests actually staying at this
Disney Resort Hotel).
As far as
EPCOT and
Disney's Hollywood Studios, since Disney's BoardWalk is still located
outside of either theme park your breakfast reservation there doesn't quite automatically grant you the ability to enter a bit earlier in the way that you can by dining at
The Crystal Palace or
Cinderella's Royal Table in Magic Kingdom Park. On the bright side, you'll be just a short jaunt away from EPCOT and perhaps a boat ride away from Disney's Hollywood Studios which are both
scheduled to open at 9:00 A.M. to all guests on both of the mornings you've indicated.
If however you're staying at a Disney Resort Hotel for this trip, you can take advantage of
Early Theme Park Entry that begins thirty minutes earlier and by being quite efficient with your breakfast you can make your way over to the nearby International Gateway entrance for a bit of a head start into EPCOT World Showcase! I hope this helps, Victor; feel free to come back again to planDisney and let us know where you'll be staying as well as where you have your breakfast booked for more specific strategies on those mornings, as well as any other answers or advice you may be seeking out!
Here's to getting a great early morning start on all your Disney adventures!
Prince