Maximum RAM configured in kernel

["Evan Clarke" <evan@proc.to>]

Hello

I am running Etch on a G4 Cube with 1.5GB of RAM in it - however, no
matter what DIMMs I use, in what order (always 3x512MB) I cannot get
it to recognise more than 1.25GB.  According to Wikipedia the maximum
amount of RAM for a G4 cube is 1.5GB.

I was wondering if there was a limit compiled into the kernel or via
an adjustable sysctl?

Thanks.