mpc83xx: add the README.mpc8360emds

add doc/README.mpc8360emds to accompany the new board support

doc/README.mpc8360emds

+Freescale MPC8360EMDS Board
+-----------------------------------------
+1.	Board Switches and Jumpers
+1.0 	There are four Dual-In-Line Packages(DIP) Switches on MPC8360EMDS board
+	For some reason, the HW designers describe the switch settings
+	in terms of 0 and 1, and then map that to physical switches where
+	the label "On" refers to logic 0 and "Off" is logic 1.
+
+	Switch bits are numbered 1 through, like, 4 6 8 or 10, but the
+	bits may contribute to signals that are numbered based at 0,
+	and some of those signals may be high-bit-number-0 too.  Heed
+	well the names and labels and do not get confused.
+
+		"Off" == 1
+		"On"  == 0
+
+	SW18 is switch 18 as silk-screened onto the board.
+	SW4[8] is the bit labled 8 on Switch 4.
+	SW2[1:6] refers to bits labeled 1 through 6 in order on switch 2.
+	SW3[7:1] refers to bits labeled 7 through 1 in order on switch 3.
+	SW3[1:8]= 0000_0001 refers to bits labeled 1 through 6 is set as "On"
+		and bits labeled 8 is set as "Off".
+
+1.1	For the MPC8360E PB PROTO Board
+
+	First, make sure the board default setting is consistent with the
+	document shipped with your board. Then apply the following setting:
+	SW3[1-8]= 0000_0100  (HRCW setting value is performed on local bus)
+	SW4[1-8]= 0011_0000  (Flash boot on local bus)
+	SW9[1-8]= 0110_0110  (PCI Mode enabled. HRCW is read from FLASH)
+	SW10[1-8]= 0000_1000  (core PLL setting)
+	SW11[1-8]= 0000_0100 (SW11 is on the another side of the board)
+	JP6 1-2
+	on board Oscillator: 66M
+
+
+2.	Memory Map
+
+2.1.	The memory map should look pretty much like this:
+
+	0x0000_0000	0x7fff_ffff	DDR			2G
+	0x8000_0000	0x8fff_ffff	PCI MEM prefetch	256M
+	0x9000_0000	0x9fff_ffff	PCI MEM non-prefetch	256M
+	0xc000_0000	0xdfff_ffff	Empty			512M
+	0xe000_0000	0xe01f_ffff	Int Mem Reg Space	2M
+	0xe020_0000	0xe02f_ffff	Empty			1M
+	0xe030_0000	0xe03f_ffff	PCI IO			1M
+	0xe040_0000	0xefff_ffff	Empty			252M
+	0xf000_0000	0xf3ff_ffff	Local Bus SDRAM		64M
+	0xf400_0000	0xf7ff_ffff	Empty			64M
+	0xf800_0000	0xf800_7fff	BCSR on CS1		32K
+	0xf800_8000	0xf800_ffff	PIB CS4			32K
+	0xf801_0000	0xf801_7fff	PIB CS5			32K
+	0xfe00_0000	0xfeff_ffff	FLASH on CS0		16M
+
+
+3. Definitions
+
+3.1 Explanation of NEW definitions in:
+
+	include/configs/MPC8360EMDS.h
+
+    CONFIG_MPC83XX	    MPC83xx family for both MPC8349 and MPC8360
+    CONFIG_MPC8360	    MPC8360 specific
+    CONFIG_MPC8360EMDS	    MPC8360EMDS board specific
+
+4. Compilation
+
+	Assuming you're using BASH shell:
+
+		export CROSS_COMPILE=your-cross-compile-prefix
+		cd u-boot
+		make distclean
+		make MPC8360EMDS_config
+		make
+
+	MPC8360 support PCI in host and slave mode.
+
+	To make u-boot support PCI host 66M :
+	1) DIP SW support PCI mode as described in Section 1.1.
+	2) Make MPC8360EMDS_HOST_66_config
+
+	To make u-boot support PCI host 33M :
+	1) DIP SW setting is similar as Section 1.1, except for SW3[4] is 1
+	2) Make MPC8360EMDS_HOST_33_config
+
+	To make u-boot support PCI slave 66M :
+	1) DIP SW setting is similar as Section 1.1, except for SW9[3] is 1
+	2) Make MPC8360EMDS_SLAVE_config
+
+
+5. Downloading and Flashing Images
+
+5.0 Download over serial line using Kermit:
+
+	loadb
+	[Drop to kermit:
+	    ^\c
+	    send <u-boot-bin-image>
+	    c
+	]
+
+
+    Or via tftp:
+
+        tftp 10000 u-boot.bin
+
+5.1 Reflash U-boot Image using U-boot
+
+	tftp 20000 u-boot.bin
+	protect off fef00000 fef3ffff
+	erase fef00000 fef3ffff
+
+	cp.b 20000 fef00000 xxxx
+
+	or
+
+	cp.b 20000 fef00000 3ffff
+
+
+You have to supply the correct byte count with 'xxxx' from the TFTP result log.
+Maybe 3ffff will work too, that corresponds to the erased sectors.
+
+
+6. Notes
+	1) The console baudrate for MPC8360EMDS is 115200bps.