[U-Boot] [PATCH 0/7][v4] powerpc: Add support 2 stage boot loader for corenet platform

[Prabhakar Kushwaha]

Signed-off-by: Prabhakar Kushwaha <prabhakar at freescale.com>
---
Changes for v2: Updated Makefile
Changes for v3: 
 - Updated B4860QDS.h config file to support B4420QDS NAND boot
 - Fix B4860QDS_SPIFLASH B4420QDS_SPIFLASH build issue
Changes for v4: 
 - Updated Makefile with latest build format


Add support of 2 stage NAND boot loader in cornet platforms using SPL framework.

In current secenrio size of u-boot can become >=512KB. So This patch set will be 
helpful for those SoC which has less internal SRAM(512KB).

here, PBL initialise the internal SRAM and copy SPL(192K) in SRAM.
SPL further initialise DDR using SPD and environment variables and copy
u-boot(768 KB) from flash to DDR.
Finally SPL transer control to u-boot for futher booting.

SPL has following features:
 - Executes within 256K
 - No relocation required

 Run time view of SPL framework :-
 -----------------------------------------------
 Area        | Address                         |
 -----------------------------------------------
 GD, BD      | 0xFFFC0000                      |
 -----------------------------------------------
 ENV         | 0xFFFC1000                      |
 -----------------------------------------------
 HEAP        | 0xFFFC2800                      |
 -----------------------------------------------
 STACK       | 0xFFFD0000		       |
 -----------------------------------------------
 U-boot SPL  | 0xfffD0000 -  0xfffffffc (192K) |
 -----------------------------------------------

NAND Flash memory Map on B4860 and B4420QDS
------------------------------------------
 Start		 End		Definition			Size
0x000000	0x0FFFFF	u-boot                          1MB
0x140000	0x15FFFF	u-boot env                      128KB
0x160000	0x17FFFF	FMAN Ucode                      128KB
---
 This patch set contains:-

 [PATCH 1/7] powerpc/mpc85xx: Move LAW_EN define outside of config

 [PATCH 2/7] powerpc/mpc85xx: Avoid hardcoding in SPL linker script
 
 [PATCH 3/7] powerpc:Add support of SPL non-relocation
 
 [PATCH 4/7] powerpc/mpc8xxx:Allow Parsing of LAW table in both SPL & non SPL
 
 [PATCH 5/7] driver/ifc: define nand_spl_load_image() for SPL

 [PATCH 6/7] Makefile: Add support of RAMBOOT_SPLPBL

 [PATCH 7/7] B4860QDS: Add support of 2 stage NAND boot loader
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1.7.9.5