For future google-rs:
The Intel motherboard in question seems to have a Marvell ATA controller, to where the PATA drives are (can be) connected.
Vendor 11ABh Marvell Semiconductor (Was: Galileo Technology Ltd)
Device 6101h 614x SATA2 Controller
PCI Class Storage, type IDE
It seems that kernel 2.6.x "have problems" handling this.
There is an Alan Cox patch to support 88SE6101/88SE6145 but only for 2.6.19
More ideas on this at gentoo-wiki:
I've just built a 2.6.20-pre7 kernel, and it sees the LG DVD writer as sr0, also successfully burnt some DVD-s.