PCI memory map for 5475

Hi,
I am using Linux on logicPd 5475 eval board. In  linux BSP,
the PCI window
register is set to 0xd0000000 with size 0x8000000; which is
about 128meg. I
wanted to open up the PCI window to 256M+ . How do I know
all the memory map
of all devices? I dont want to overlap with other devices. 
I have tried two things.
1. Move the PCI windows base to 0xc0000000. (My kernel
crashes during PCI
initialization .
2. I changed the window size ..

Why would the kernel crash when I move the PCI window base.
Even if I choose
0xb0000000 it crashes. This is as if the system would not
work if I have PCI
windows at 0xd0000000 .


My new code ./arch/m68k/coldfire/pci.c . This doesnt seem to
work either.
#define HOST_MEM_BASE    	0xD0000000	/* ColdFire Memory
window base 	*/
#define PCI_MEM_BASE    	0xD0000000	/* PCI Memory window
base	*/
#define PCI_MEM_SIZE    	0x0f000000	/* Memory window size
(128M)	*/
#define HOST_IO_BASE     	0xDf000000	/* ColdFire I/O window
base 	*/
#define PCI_IO_BASE_ADDR     	0x00000000	/* PCI I/O window
base 		*/
#define PCI_IO_SIZE     	0x00010000	/* I/O window size (64K)
	*/
#define HOST_CFG_BASE    	0xDf000000	/* ColdFire config
window base 	*/
#define PCI_DMA_BASE 		0xC0000000	/* PCI-DMA window base
		*/  


I really need help. What I am doing wrong. This should be
very simple.
                 Thanks 
                   Cold_newbie
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