Snow Leopard 64 bits mode (EFI64 Firmware)

Snow Leopard 64 bits mode (EFI64 Firmware) How do I get the EFI64 firmware on my iMac 20" (late 2006) with Intel Core 2 Duo?
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Guest [Entry]

"As there is no EFI64 firmware update, the only option left to know if you have a 64 bits EFI is to run the following command:

ioreg -l -p IODeviceTree | grep firmware-abi

If the result is ""firmware-abi"" = <""EFI64"">, then you have a 64 bits comptabible EFI.
If the result is ""firmware-abi"" = <""EFI32"">, then you don't have a 64 bits compatible EFI.

This parameter only affects the kernel load by Snow Leopard. You can still run 64 bits applications, bu the kernel will run as 32 bits."