I got that board before, it has ICH9R 6 SATA ports and JMicron's 2 SATA ports (different colors) and 1 IDE port.
So I think you need one of the kexts posted by mormegil for JMicron in 64 bits or use the vanilla JMicron from SL that is 32 bits only, if its missing some JMicron device ids you can use an injector or edit the JMicronATA plist to add them (worse).

My DVD is attached to the ATA (IDE) port. If I understand your post correctly, this port is also controlled by the JMicron controller. Is that right?

Thanks.

Solution
 

It works with the kext compiled for 64-bit that you can find here:

http://cid-8b65993ef55cf014.skydrive...=?sa=705164175

The only drawback is that this kext only works if I boot in 64-bit, but I think that's fine. Thanks everyone!

so, I can't use both JMicronATA and IOATAFamily?
I've put both in extensions folder and they're 64bit

sorry for such noobish questions.. :/

Now that you have both extensions, is it working? If it is, then you can :)

You need both extensions, IOATAFamily gives generic ATA protocol support (plus support for specific controllers like Intel ICH) and JMicronATA gives support for specific JMicron controller.
A kext can support only 32 bits, only 64 bits, or both 32 and 64 bits. Older Leo kexts are mostly 32 bits only, newer patched kexts like the patched JMicron could be 64 bits only. Most Apple's vanilla kexts support both 32 & 64 bits, like
IOATAFamily is 32/64, but there are reports it causes kernel panics on certain ICH chipsets when working in 64 bits. There is a patched IOATAFamily thats supposedly corrects that. Either the original one or the patched one should work in both 32 and 64 bits.

still haven't figure what to do with my dvd drive.. :C it just wont work.. not in 32bit or 64bit..
any suggestions witch kext to put?
jmicronata and ioatafamily wont work..

I had a similar problem with a Tsst Corp. DVD RW drive, I then replaced my DVD RW with a Pioneer SATA drive from Wally-world (Wal-Mart).

Then everything went Smoooothly........

I have a LiteOn DVDRW that works
perfect with the vanilla jmicronata in 32 bits, either your drive model has some incompatibility or you did something wrong with the kexts, maybe if you post more details someone can give you a hint. Also check the drive is connected correctly (cable, jumpers...).