Well, in case anyone is reading this thread, here is as much info on the HD 6370M as can be extracted from Aida64 under windows and from under OSX (DSDT and ioreg o/p)
This is from a works laptop Lenovo G570 which unfortunately seems to just have this graphics chip and does not have the HD3000 enabled (boo hoo....otherwise it would be perfect for OSX).
Anyway, I don't believe this chip will work but in case the info is valuable and someone does want to work on it here is the full graphics report section.
ReportDisplay.txt
and the output of radeon bios decode:
Bios decoded.zip
and the ioreg from the Lenovo G570 (yes, I did get OSX installed but am not interested in carrying on with a lappie that only has basic resolution).
IOreg G570.zip
Finally, here is my extracted DSDT.
dsdt.zip
Good luck to anyone with getting the 6370M working and I hope the info in these files helps someone.