board/t104xrdb: Add support of NAND, SD, SPI boot for T104xRDB

Add support of 2 stage NAND, SD, SPI boot loader using SPL framework.
here, PBL initialise the internal SRAM and copy SPL(160KB). This further
initialise DDR using SPD and environment and copy u-boot(768 KB) from NAND to DDR.
Finally SPL transer control to u-boot.

Initialise/create followings required for SPL framework
      - Add spl.c which defines board_init_f, board_init_r
      - update tlb and ddr accordingly

Signed-off-by: Prabhakar Kushwaha <prabhakar@freescale.com>
Reviewed-by: York Sun <yorksun@freescale.com>

1 files changed, 73 insertions, 0 deletions

diff --git a/board/freescale/t104xrdb/README b/board/freescale/t104xrdb/README
index 1da52bb..cdbe1fa 100644
--- a/board/freescale/t104xrdb/README
+++ b/board/freescale/t104xrdb/README
@@ -198,3 +198,76 @@ The below commands apply to the board
 
 	2.To change from vbank4 to vbank0
 		=> qixis reset (it will boot using vbank0)
+
+NAND boot with 2 Stage boot loader
+----------------------------------
+PBL initialise the internal SRAM and copy SPL(160KB) 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 during  boot :-
+ -----------------------------------------------
+ Area        | Address                         |
+-----------------------------------------------
+ Secure boot | 0xFFFC0000 (32KB)               |
+ headers     |                                 |
+ -----------------------------------------------
+ GD, BD      | 0xFFFC8000 (4KB)                |
+ -----------------------------------------------
+ ENV         | 0xFFFC9000 (8KB)                |
+ -----------------------------------------------
+ HEAP        | 0xFFFCB000 (30KB)               |
+ -----------------------------------------------
+ STACK       | 0xFFFD8000 (22KB)               |
+ -----------------------------------------------
+ U-boot SPL  | 0xFFFD8000 (160KB)              |
+ -----------------------------------------------
+
+NAND Flash memory Map on T104xRDB
+------------------------------------------
+ Start		 End		Definition			Size
+0x000000	0x0FFFFF	u-boot                          1MB
+0x180000	0x19FFFF	u-boot env                      128KB
+0x280000	0x29FFFF	FMAN Ucode                      128KB
+0x380000	0x39FFFF	QE Firmware                     128KB
+
+SD Card memory Map on T104xRDB
+------------------------------------------
+ Block		#blocks		Definition			Size
+0x008		2048		u-boot                          1MB
+0x800		0024		u-boot env                      8KB
+0x820		0256		FMAN Ucode                      128KB
+0x920		0256		QE Firmware                     128KB
+
+SPI Flash memory Map on T104xRDB
+------------------------------------------
+ Start		 End		Definition			Size
+0x000000	0x0FFFFF	u-boot                          1MB
+0x100000	0x101FFF	u-boot env                      8KB
+0x110000	0x12FFFF	FMAN Ucode                      128KB
+0x130000	0x14FFFF	QE Firmware                     128KB
+
+Please note QE Firmware is only valid for T1040RDB
+
+
+Switch Settings: (ON is 0, OFF is 1)
+===============
+NAND boot SW setting:
+SW1: 10001000
+SW2: 00111001
+SW3: 11110001
+
+SPI boot SW setting:
+SW1: 00100010
+SW2: 10111001
+SW3: 11100001
+
+SD boot SW setting:
+SW1: 00100000
+SW2: 00111001
+SW3: 11100001