2570P doesn't support mSATA. Hacking in support is quite a challenge.
I looked at the mSATA slot and noticed there are tracks that lead to the SATA pins (23, 25, 31, 33) but they aren't attached. Bridging those tracks would give an electrical link. Though that's not the end of the problem. The greater issue is getting a BIOS that has enabled the SATA controller that attaches to those electrical lines AND can make use of it. AFAIK only the 8470W/8570W has a mSATA friendly BIOS but doesn't provide boot support. Rather, mSATA on those systems acts as cache to an auxilery HDD.
Unfortunately the 2570P bios is RSA protected. Flashing a modified BIOS that say disables the WWAN whitelist results in system failing to boot. Nobody has successfully created a modified bios.
Fuente.