0xAA88 bytes are copied from 0x2508 to 0x810484

IRAM usage:

800000:	everything from here to 81047C is zeroed out
800000: byte var, init to 0
800004: 1 written here
800008: var set to bottom of SVC stack
80000C: var set to top of SVC stack
800010: 16-bit checksum of copy-to-RAM block, before copy
800012: 16-bit checksum of copy-to-RAM block, after copy
810014:	16-bit var, init to 0
810016:	16-bit var, init to 0
810018: byte var, init to 0x00
810019: byte var, init to 0xBC
81001C: 32-bit var, init to 0
810020:	byte var, init to 0x00, apparently flag indicating that the array
	at 0x810024 has been initialized
810021:	byte var, init to 0x00
810024: 32-bit var, init to 0
810024: array of 3 structs, 24 (0x18) bytes each, one for each flash region
	init by routine at 0xb3a8
	offset 00: ptr to start of flash region
	offset 04: 32-bit init to 0, appears to be a state in the [0,2] range:
		0: initial
		1: checked and found to contain an image
		2: result of calling 0xb0c2 in mode 2
	offset 08: byte init to 0, incremented each time 0xb0c2 in mode 1
			succeeds
	offset 09: byte init to 0
	offset 0C: init to 0x12345678
	offset 10: 32-bit init to 0
	offset 14: 16-bit init to 0
81006C:	table of 3 32-bit words, pointers to structures describing
	3 flash2 regions, init to {0081a4d0, 0081a768, 0081aa00}
810078: 32-bit var, init to 0
81047C:	bottom of init stack (0x400 bytes)
81047C: byte var, init to 0
810484: first byte used by copied code block
81AF0B: last byte ""
81AF60: initial SP for abort and undef
81AFF8:	bottom of SVC stack
81B454: initial SVC SP
81B4D4:	initial IRQ SP
81B6D4: initial FIQ SP