[ARM] mm: switch SA1100 to use sparsemem

config ARCH_SA1100

	bool "SA1100-based"

	select ISA

	select ARCH_DISCONTIGMEM_ENABLE

	select ARCH_SPARSEMEM_ENABLE

	select ARCH_SELECT_MEMORY_MODEL

	select ARCH_MTD_XIP

	select GENERIC_GPIO

	select GENERIC_TIME

/*

 * Because of the wide memory address space between physical RAM banks on the

 * SA1100, it's much convenient to use Linux's NUMA support to implement our 

 * memory map representation.  Assuming all memory nodes have equal access 

 * SA1100, it's much convenient to use Linux's SparseMEM support to implement

 * our memory map representation.  Assuming all memory nodes have equal access

 * characteristics, we then have generic discontiguous memory support.

 *

 * Of course, all this isn't mandatory for SA1100 implementations with only

 * one used memory bank.  For those, simply undefine CONFIG_DISCONTIGMEM.

 *

 * The nodes are matched with the physical memory bank addresses which are 

 * incidentally the same as virtual addresses.

 * The sparsemem banks are matched with the physical memory bank addresses

 * which are incidentally the same as virtual addresses.

 * 

 * 	node 0:  0xc0000000 - 0xc7ffffff

 * 	node 1:  0xc8000000 - 0xcfffffff

 * 	node 2:  0xd0000000 - 0xd7ffffff

 * 	node 3:  0xd8000000 - 0xdfffffff

 */

#define NODE_MEM_SIZE_BITS	27

#define MAX_PHYSMEM_BITS	32

#define SECTION_SIZE_BITS	27

/*

 * Cache flushing area - SA1100 zero bank