beta2 ongoing development

[IriDium]

I basically follow the instructions http://forum.xbian.org/thread-427-post-12999.html#pid12999

Which means I change:
change "LABEL=xbian-root-btrfs" to "root=/dev/sda1", remove "subvol=root/@," option from "/" in fstab.
and
change "LABEL=xbian-root-btrfs" to "root=/dev/sda1" remove "subvol=root/@" from cmdline.txt.

That works.

...but when I want to upgrade to Beta 1.2 it errors on

btrfs-auto-snapshot snapshot —name beta2 root with volume not found.

So what should I have in FSTAB and CMDLINE.TXT to use subvolumes but also load from /dev/sda1