X-Git-Url: https://git.karo-electronics.de/?a=blobdiff_plain;f=doc%2FREADME.b4860qds;h=eada0c7dd89b55d7be39bc500c241dd491e6eaa4;hb=ba644d5124fc4f105696de87962138a646ec0208;hp=48ece4b835d6330d6d695ec80e14abd7278dbc52;hpb=3765b3e7bd0f8e46914d417f29cbcb0c72b1acf7;p=karo-tx-uboot.git

diff --git a/doc/README.b4860qds b/doc/README.b4860qds
index 48ece4b835..eada0c7dd8 100644
--- a/doc/README.b4860qds
+++ b/doc/README.b4860qds
@@ -227,17 +227,17 @@ Start Address	End Address	Description	Size
 NOR Flash memory Map on B4860 and B4420QDS
 ------------------------------------------
  Start		 End		Definition			Size
-0xEFF80000	0xEFFFFFFF	u-boot (current bank)		512KB
-0xEFF60000	0xEFF7FFFF	u-boot env (current bank)	128KB
-0xEFF40000	0xEFF5FFFF	FMAN Ucode (current bank)	128KB
-0xEF300000	0xEFF3FFFF	rootfs (alternate bank)		12MB + 256KB
+0xEFF40000	0xEFFFFFFF	u-boot (current bank)		768KB
+0xEFF20000	0xEFF3FFFF	u-boot env (current bank)	128KB
+0xEFF00000	0xEFF1FFFF	FMAN Ucode (current bank)	128KB
+0xEF300000	0xEFEFFFFF	rootfs (alternate bank)		12MB
 0xEE800000	0xEE8FFFFF	device tree (alternate bank)	1MB
 0xEE020000	0xEE6FFFFF	Linux.uImage (alternate bank)	6MB+896KB
 0xEE000000	0xEE01FFFF	RCW (alternate bank)		128KB
-0xEDF80000	0xEDFFFFFF	u-boot (alternate bank)		512KB
-0xEDF60000	0xEDF7FFFF	u-boot env (alternate bank)	128KB
-0xEDF40000	0xEDF5FFFF	FMAN ucode (alternate bank)	128KB
-0xED300000	0xEDF3FFFF	rootfs (current bank)		12MB+256MB
+0xEDF40000	0xEDFFFFFF	u-boot (alternate bank)		768KB
+0xEDF20000	0xEDF3FFFF	u-boot env (alternate bank)	128KB
+0xEDF00000	0xEDF1FFFF	FMAN ucode (alternate bank)	128KB
+0xED300000	0xEDEFFFFF	rootfs (current bank)		12MB
 0xEC800000	0xEC8FFFFF	device tree (current bank)	1MB
 0xEC020000	0xEC6FFFFF	Linux.uImage (current bank)	6MB+896KB
 0xEC000000	0xEC01FFFF	RCW (current bank)		128KB
@@ -328,3 +328,39 @@ The below commands apply to both B4860QDS and B4420QDS.
    On Linux the interfaces are renamed as:
 	. eth2 -> fm1-gb2
 	. eth3 -> fm1-gb3
+
+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 B4860 and B4420QDS
+------------------------------------------
+ Start		 End		Definition			Size
+0x000000	0x0FFFFF	u-boot                          1MB
+0x140000	0x15FFFF	u-boot env                      128KB
+0x1A0000	0x1BFFFF	FMAN Ucode                      128KB