Merge remote-tracking branch 'u-boot-samsung/master'

[karo-tx-uboot.git] / doc / README.t4240qds

diff --git a/doc/README.t4240qds b/doc/README.t4240qds
index a9841fb5f74c76f558141041cee35cb8c731d171..ef8c75f3b2c853e219649fb6acb42079a72b04cd 100644 (file)
--- a/doc/README.t4240qds
+++ b/doc/README.t4240qds
@@ -120,3 +120,56 @@ The override voltage takes effect when booting.
 Note: voltage adjustment needs to be done step by step. Changing voltage too
 rapidly may cause current surge. The voltage stepping is done by software.
 Users can set the final voltage directly.
+
+2-stage NAND/SD boot loader
+-------------------------------
+PBL initializes the internal SRAM and copy SPL(160K) in SRAM.
+SPL further initialise DDR using SPD and environment variables
+and copy u-boot(768 KB) from NAND/SD device to DDR.
+Finally SPL transers 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                       |
+-------------------------------------------------
+|SecureBoot header | 0xFFFC0000        (32KB)          |
+-------------------------------------------------
+|GD, BD                | 0xFFFC8000    (4KB)           |
+-------------------------------------------------
+|ENV           | 0xFFFC9000    (8KB)           |
+-------------------------------------------------
+|HEAP          | 0xFFFCB000    (50KB)          |
+-------------------------------------------------
+|STACK         | 0xFFFD8000    (22KB)          |
+-------------------------------------------------
+|U-boot SPL    | 0xFFFD8000    (160KB)         |
+-------------------------------------------------
+
+NAND Flash memory Map on T4QDS
+--------------------------------------------------------------
+Start          End             Definition      Size
+0x000000       0x0FFFFF        u-boot img      1MB
+0x140000       0x15FFFF        u-boot env      128KB
+0x160000       0x17FFFF        FMAN Ucode      128KB
+
+Micro SD Card memory Map on T4QDS
+----------------------------------------------------
+Block          #blocks         Definition      Size
+0x008          2048            u-boot img      1MB
+0x800          0016            u-boot env      8KB
+0x820          0128            FMAN ucode      64KB
+
+Switch Settings: (ON is 1, OFF is 0)
+===============
+NAND boot SW setting:
+SW1[1:8] = 10000010
+SW2[1.1] = 0
+SW6[1:4] = 1001
+
+SD boot SW setting:
+SW1[1:8] = 00100000
+SW2[1.1] = 0