No DSDT patch for Asus M4A785TD-V EVO motherboard #DSDT

After failing to find any DSDTs for my motherboard (Asus M4A785TD-V EVO) on this site, Google or any other sites with DSDT databases, I looked at how to create your own DSDT.

I have looked at a list of DSDT patches here and could not find one for my motherboard. I also cannot find any online.

How do you go about creating your own DSDT patch? Is there an automatic way of doing it, or do you have to do it by hand?