Ah yes, I managed to miss the other blog with the freescale hint
Originally Posted by GeneralAntilles
No, OMAP3 chips can use a wide variety of RAM sizes, but because of price, availability and power consumption (I'm not sure if there are 512MB PoPs available in any real quantity yet) 256MB is the sweet spot for the moment.
Depending of the device size/layout, they might not even go for (only) PoP memory. The 3440 based ECS T800 is supposed to have 512MB, but true enough, some MX515 devices have been announced with 512MB already.