diff options
| author | Shaohui Xie | 2014-04-22 15:10:44 +0800 |
|---|---|---|
| committer | York Sun | 2014-04-22 17:58:53 -0700 |
| commit | b6036993ebf12d360692a7df227537277afe3a1f (patch) | |
| tree | b063445f4cd8225d787bb5a3baa45d36243ada1f /doc | |
| parent | cb753850e8af5a224d7c08b4fd1d258082d3bbd5 (diff) | |
powerpc/T4QDS: add two stage boot of nand/sd
Add support of 2 stage NAND/SD boot loader using SPL framework.
PBL initialise the internal SRAM and copy SPL, this further
initialise DDR using SPD and environment and copy u-boot from
NAND/SD to DDR, finally SPL transfer control to u-boot.
NOR uses CS1 instead of CS2 when NAND boot, fix it.
Signed-off-by: Shaohui Xie <Shaohui.Xie@freescale.com>
Reviewed-by: York Sun <yorksun@freescale.com>
Diffstat (limited to 'doc')
| -rw-r--r-- | doc/README.t4240qds | 53 |
1 files changed, 53 insertions, 0 deletions
diff --git a/doc/README.t4240qds b/doc/README.t4240qds index a9841fb5f74..ef8c75f3b2c 100644 --- 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 |