hardware smbus problems. Which is good. I've still got that p2b so I'll test and see if I get the same results as you.
I pulled out my old p2b board and manged to find all the stuff to make it boot. Then ran the current V2 p2b target build.
Indeed it dumps the SPD out just fine. So yah! Thats good news. My V1 stuff must have had some other issue that kept the RAM from getting detected properly.