increase flash memory mpc8569

I am a total newbie to embedded linux and I am in a serious trouble.
I have with me a board with MPC8569E and 256Mb Flash Memory. I need to increase the flash memory to 512 Mb.

The memory map of earlier flash is 0xf000_0000 to 0xffff_ffff
The base address of flash as I can see in Uboot file include/configs/MPC8569MDS.h
#define CONFIG_SYS_FLASH_BASE 0xF0000000

I am not aware of what all changes I should do in Uboot to implement this change. I know I have to do something with Local bus LAWBARs and LAWARs and a lot of other registers. Can somebody help me out.

Could be handy, could be a major issue. You need an identical chip, and an extra address line in hardware. Have you got it? You also need the 512mb of unallocated space. Have you got that?

Originally Posted by business_kid Could be handy, could be a major issue. You need an identical chip, and an extra address line in hardware. Have you got it? You also need the 512mb of unallocated space. Have you got that?

An Identical chip, yes I have got, have got the extra address line too and yeah the unallocated space, 512Mb, I have it. What next. What is that I should change in the file include/configs/MPC8569MDS.h? I am unable to find any reference on how the file is designed or what MACROS mean what. I have a vague Idea from their name though.
The concept of LAWs and MMUs also confuses me now. Damn I am doomed. I am working on it. Any help is appreciated.

If you have everything, put it in place, and boot up. There is a basic routine checking of "what sort of box is this?" done as the kernel boots and it will figure out the memory. Write a random digit to several places, and read it. Where there is memory, you will find your random digit; where not, you read back 0xFF.

There may also be space for configuration information in the kernel. There _used_ to be a spot for options for small systems.