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Diffstat (limited to 'doc/README.b4860qds')
| -rw-r--r-- | doc/README.b4860qds | 36 |
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 |