Physical memory allocation to L4linux

Hi all, I start l4linux by specifying 64M on memory in its configuration file. I would like this memory to be a fixed range of physical memory and I was wondering if there is a way to do it. I understand from my earlier posts that the image of l4linux is in the same location everytime because the boot loader puts it there. I am not referring to this memory. I am concerned with the 64M that will potentially get allocated to l4linux. Thanks in advance, ramya