Hi,
i work on project with Omega2S+and 8GB eMMC storage.
I confirme, successfull work and tested with this eMMC (THGBMHG6C1LBAIL), link text

root@Omega-41C4:~# lsblk
NAME MAJ:MIN RM SIZE RO TYPE MOUNTPOINT
mtdblock0 31:0 0 192K 1 disk
mtdblock1 31:1 0 64K 1 disk
mtdblock2 31:2 0 64K 0 disk
mtdblock3 31:3 0 31.7M 0 disk
mtdblock4 31:4 0 1.3M 1 disk
mtdblock5 31:5 0 30.4M 1 disk /rom
mtdblock6 31:6 0 24.4M 0 disk /overlay
mmcblk0 179:0 0 7.3G 0 disk
└─mmcblk0p1 179:1 0 7.3G 0 part
root@Omega-41C4:~#