As mentioned, the Primavera 100 mile and 100k routes go UP the Wall. There's a rest stop after you start climbing Calaveras but about a mile before you climb the Wall.

Here's my recommendation: do NOT eat a lot at the rest stop. It does not work well for climbing the Wall -- your stomach will not appreciate it. (Well, at least mine didn't. )

Eat lightly at the rest stop, and take some of the goodies with you for after you climb the Wall.

I'm still debating whether to do the 100 mile or 100k at Primavera this year....

-- Melissa