Well I guess you are running that modified PC_EFI 9.x version avaible on the installer you had been using. (Can't confirm that it was avaible, just think to remind that...) With that you cannot upgrade your bootlaoder just by replacing the boot file.
Get the Chameleon v2 RC1 installer Package from here:
http://chameleon.osx86.hu/static/som...0-r431.pkg.zip
and install it to your Snow Partition. (Be aware: RC1 is not Snowy capable, so do not reboot yet!) Then use "sudo rm -f /boot" to remove the old booter. Download PC_EFI 10.5 booter from here:
http://netkas.org/?p=271 and extract it to the root (/) your Snow Leopard Partition.
The DSDT is one of the ACPI tables your BIOS/Chipset provides to the software and is written in ASL language. Our bootloaders support the feature to inject a modified DSDT to the OS.
There are varios ways to pick it out. You can use
this GUI or the text based one by fassl - select 0 Darwin as OS and it will also do some optimisations. To fix the Device RTC you need to disassemble it for that purpose you need iasl - get the ziped one from my attachment enter "open /usr/bin" on Terminal and drag it into that folder.
Next type "iasl -d" on Terminal and drag the DSDT.aml the Patcher created into the Terminal window and press enter - you should now have an DSDT.dsl which you can edit also. Once you made the modifications, you need to reassamble it - write "iasl -ta" on Terminal and drag the DSDT.dsl into the Terminal window again, the afterwards returned DSDT.aml file can be placed into /Extra folder, to be used by PC_EFI.