Haven't tried it but here is a pretty neat how-to (seems easy too):
http://www.bydavy.com/2012/01/compiling-linux-kernel-modules-for-synology-devices/
cheers
vic
AX88179 - USB3.0 to 10/100/1000M Gigabit Ethernet Controller
SiI3114 - Silicon Image PCI SATA 4 CHANNEL (2 EXT + 4 INT PORTS ) RAID CARD
A 10$ PayPal donation from my side for including these 2 devices