Attic firewall question

If I have an attic pull down door to access the attic in the garage, can I get by with getting a
fire rated attic door, or do I need an fire wall all the way to the roof. If I install a firewall to separate the attic space above the garage and house, how do I gain access to the rest of the attic. I can’t put another pull down attic door in hallway because the cold air return duct is above the hallway.

yes

It could be a scuttle, doesn’t have to be pulled down stairs.

If he doesn’t have a rated fold down stair in the garage already, there is no reason he can’t add a fire rated door in the separation between the garage attic and the house attic. It would have to be gasket-ed, and self-closing. You can buy a rated short height door for that purpose between separations.
That would be a scenario if you can’t find a place in the home for a scuttle opening.