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authorPrabhakar Kushwaha <prabhakar@freescale.com>2014-04-08 19:13:44 +0530
committerYork Sun <yorksun@freescale.com>2014-04-22 17:58:51 -0700
commitc5dfe6ec58e0b504cba5b429200f6a5d217d5bd9 (patch)
treeb769cf573080fcd60892b9bb49e3abaab76bc436 /doc
parent89ad7be8e713f33ec677cf4576e0c9b0ed83f7c6 (diff)
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board/b4qds:Add support of 2 stage NAND boot-loader
Add support of 2 stage NAND 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>
Diffstat (limited to 'doc')
-rw-r--r--doc/README.b4860qds36
1 files changed, 36 insertions, 0 deletions
diff --git a/doc/README.b4860qds b/doc/README.b4860qds
index 3da77d9..eada0c7 100644
--- a/doc/README.b4860qds
+++ b/doc/README.b4860qds
@@ -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