How to combine downlinks on c7000 BL480 with 1:10GB?

[Paul Dudson]

Customer has 2x BL480 without ethernet mez cards ( using the guilt ethernet.
C7000 has two 1:10Gb ethernet in slots 1 & 2
Running VMware on the BL480, with a virtual ethernet switch.
For the first BL480
Wants to combine the four ports (1&2 ,9&10) as a single trunk.
What magic do we have to do on the two 1:10GB to make it look like one switch, to allow the full 4x 1gb dowmlink?
( the combinations we tried with LACP and trunking all only seemd to allow 2x 1GB downlinks)
Regards Paul