> The line you want to look at is under Reference Platforms where
> it mentions "P2020/P2010 P2020RDPC $595 QorIQ P2020/P2010
> Reference Design Board"
> If you look this up on Freescake's website you'll find the
> P2020DS-PA Development System.
> http://cache.freescale.com/files/netcomm/doc/fact_sheet/P2020DS.pdf?fsrch=1&sr=1

...which is not only larger (ATX instead of mITX) than the P2020RDB but also almost 6 times as expensive (P2020DS-PC just being a more recent revision of the P2020DS-PA).

> appears to be a larger, better expanded version of the older boards.
> http://www.freescale.com/webapp/sps/site/prod_summary.jsp?code=P2010RDB&fsrch=1&sr=1

It has nothing to do with "older" or "newer". Freescale basically offers two lines of boards for the P2020/P2010, one line being the reference boards at 595 USD called P2020RDB and the other line being the development boards at 3500 USD called P2020DS. Both lines exist in parallel, each having undergone several minor revisions so far ('PA' to 'PB' to 'PC').

> The processor (a P2020) is a dual core E5500 derivative

No, the P2020's cores are e500v2, not e5500. Where did you get that misinformation from?

> The boars has two PCIw slots, another slot referred to as an SGMI riser card slot
> (apparently related to networking), and what appears to be a PCI slot (which isn't
> mentioned in the documentation).

From the P2020DS block diagram I conclude the PCIe x2 slot and the SGMII slot to work mutually exclusive, as well as the PCIe x1/x2 slot and the M1575 (including Audio, (e)SATA and the PCI slot) to work mutually exclusive (in a sense that you could either operate the slot at x2 speed and have the M1575 turned off, or operate the M1575 and that slot at x1 speed each at the same time).

> So $595 [...] its cheaper than any board from Acube

No, 3500, which is multiple times the cost of the Sam460ex.

> This looks more powerful than the SAM460EX. [...] its E5500 cores
> should be more powerful than the SAM460EX

The P2020's e500v2 (not e5500) cores don't have a proper FPU, which the PPC460EX has:

https://morph.zone/modules/newbb_plus/viewtopic.php?topic_id=6196&forum=11&post_id=62074#62074

> I should have let Andreas post this for you guys

I wouldn't have posted this since on 'our market' I don't see the point in a CPU lacking proper FPU at all. Furthermore, I don't see the point in a 3500 USD board for our purposes.

> he's sure to post corrections to any errors I've made

You bet :-)

> what do you think?

I think you got everything confused that can possibly be confused ;-)