Can't enable 64bit kernel mode on my MBP

Question

I typed the command "system_profiler SPHardwareDataType | grep "Model Identifier" | cut -d: -f2" and it shown that my mbp is MacBookPro3,1 and then I typed "ioreg -l -p IODeviceTree | grep firmware-abi", the terminal said that is " | | "firmware-abi" = <"NO". and I checked the Extensions, there are also many NOs on that list, What is that problem? I know that EFI-64 could enable 64bit Snow Leopard but how come my mbp can't?
Please help me, thank you!

Answer 1

A 64-bit chip and 64-bit EFI do not guarantee running the 64-bit kernel. In fact very few Macs can run the kernel. My four month old Mac mini cannot boot into 64-bit. Apple to date has disabled the 64-bit kernel for all MacBooks and the Mac mini.
This is the rule
A 32-bit processor can only run 32-bit stuff.
A 64-bit processor can run 32-bit and 64-bit stuff.
(stuff can be system, kernel, applications, drivers, etc)
So you need a 64-bit processor to run 64-bit anything
On a 64-bit processor:
A 32-bit Kernel can run both 32 and 64 bit applications.
A 64-bit Kernel can run both 32 and 64 bit applications.
A 32-bit Kernel can load only 32-bit kexts (kernel extensions).
A 64-bit Kernel can load only 64-bit kexts (kernel extensions).
Marcus Winter
Here is the list.
Dah•veed