Jerry Ferrara -- Don't Blame Me Mark Wahlberg ... I'll Do 'Entourage' Movie for Free

1:00 PM PT -- Adrian Grenier shed some light on the "Entourage" feud ... saying, "It has, & never will be about the money for me. I promise."

However on his Instagram, AG added ... the issue really is about money ... but for the entire cast -- "I will sign any deal that gives ALL the boys an opportunity to share in the upside of success EQUALLY." Translation: Someone on the cast is getting paid way more than everyone else, and Adrian's pissed.

The mystery of the "Entourage" movie just got a little deeper -- Turtle, aka Jerry Ferrara tells us he doesn't care how much he gets paid ... and it's not his fault the project's on hold.

TMZ broke the story ... "Entourage" executive producer Mark Wahlberg said the long anticipated film version of the HBO show would start shooting when the "guys stop being so greedy."

Today at LAX, Jerry claimed Mark wasn't pointing the finger at him because, "I'd do it for free."