Doesn't seem to work, I haven't exhaustively confirmed on all BSP based kernels but Ayufan's xenial image based of the BSP kernel doesn't seem to detect it.
Mainline Arch seems to see it, but then hangs at boot.
The same eMMC card works fine on the baseboard.
Edit: So the hang a boot was a misdirection
This is what I see in the logs about what I think is the eMMC:
[ 4.591099] mmc2: unrecognised CSD structure version 0
[ 4.596307] mmc2: error -22 whilst initialising MMC card
Mainline Arch seems to see it, but then hangs at boot.
The same eMMC card works fine on the baseboard.
Edit: So the hang a boot was a misdirection
This is what I see in the logs about what I think is the eMMC:
[ 4.591099] mmc2: unrecognised CSD structure version 0
[ 4.596307] mmc2: error -22 whilst initialising MMC card