#define  BOOT_ROM_COPY_DATA_LEN 0x1000  /×4 K bytes */
#define  IVT_OFFSET  0x400
typedefstruct{uint8_t tag;uint16_t length;uint8_t version;
}ivt_header_t;
typedefstruct{ivt_header_t header;uint32_tentry;uint32_treserved1;uint32_tdcd_ptr;uint32_tboot_data_ptr;uint32_tself;uint32_tcsf;uint32_treserved2;
} ivt_t;
typedefstruct{uint32_tstart;uint32_tsize;uint32_tplugin;
}boot_data_t;uint32_t *ocram_load_ptr;
ivt_header_t*ivt_h;
ivt_t  *ivt;
boot_data_t   *boot_data_ptr;
ocram_load_ptr=malloc(OCRAM,BOOT_ROM_COPY_DATA_LEN);
copy_to_ocram(spi_flash_addr0,BOOT_ROM_COPY_DATA_LEN, ocram_load_ptr);
ivt_h  =(ivt_header_t *)(ocram_load_ptr+ IVT_OFFSET);
ivt   =(ivt_t*)(ocram_load_ptr+ IVT_OFFSET);
if(ivt_h->tag!=0xD1){trace"invalid ivt head tag";return-1;
}/*DCD有效性检查*/
......
/*调用DCD中的命令，对DDR、时钟等进行配置*/
......
/*DDR已可用*/boot_data_ptr =(boot_data_t *)(ocram_load_ptr +(ivt->dcd_ptr-ivt->self));
copy_to_ddr(boot_data_ptr->start,boot_data_ptr->size,spi_flash_addr0);
jump_to ivt->entry;

ivt_header: .word 0x402000D1 /* Tag=0xD1, Len=0x0020, Ver=0x40 */
app_code_jump_v: .word _start
reserv1: .word 0x0
dcd_ptr: .word dcd_hdr
boot_data_ptr: .word boot_data
self_ptr: .word ivt_header
#ifdef CONFIG_SECURE_BOOT
app_code_csf: .word __hab_data
#else
app_code_csf: .word 0x0
#endif
reserv2: .word 0x0boot_data: .word TEXT_BASE
#ifdef CONFIG_SECURE_BOOT
image_len: .word __hab_data_end - TEXT_BASE + CONFIG_FLASH_HEADER_OFFSET
#else
image_len: .word _end_of_copy - TEXT_BASE + CONFIG_FLASH_HEADER_OFFSET
#endif
plugin: .word 0x0dcd_hdr: .word 0x40E001D2 /* DDR cfg Tag=0xD2, Len=59*8 + 4 + 4, Ver=0x40 */write_dcd_cmd: .word 0x048402CC /* Tag=0xCC, Len=80*8 + 4, Param=0x04 */
/* DCD *//* DDR3 initialization based on the MX6Solo Auto Reference Design (ARD) */
/* DDR IO TYPE */
MXC_DCD_ITEM(1, IOMUXC_BASE_ADDR + 0x774, 0x000c0000)
MXC_DCD_ITEM(2, IOMUXC_BASE_ADDR + 0x754, 0x00000000)/* CLOCK */
MXC_DCD_ITEM(3, IOMUXC_BASE_ADDR + 0x4ac, 0x00000030)
MXC_DCD_ITEM(4, IOMUXC_BASE_ADDR + 0x4b0, 0x00000030)
......

/* image version */
IMAGE_VERSION 2/** Boot Device : one of* spi, sd (the board has no nand neither onenand)*/
BOOT_FROM      spi#define __ASSEMBLY__
#include <config.h>
#include "asm/arch/mx6-ddr.h"
#include "asm/arch/iomux.h"
#include "asm/arch/crm_regs.h"#include "ddr-setup.cfg"
#include "1066mhz_4x128mx16.cfg"
#include "clocks.cfg"

DATA 4, MX6_IOM_DRAM_SDQS0, 0x00000030
DATA 4, MX6_IOM_DRAM_SDQS1, 0x00000030
DATA 4, MX6_IOM_DRAM_SDQS2, 0x00000030
DATA 4, MX6_IOM_DRAM_SDQS3, 0x00000030

IMAGE_VERSION 2
BOOT_FROM spi
DATA4,0x020e05a8,0x00000030
DATA4,0x020e05b0,0x00000030
DATA4,0x020e0524,0x00000030
DATA4,0x020e051c,0x00000030

statictable_entry_t imximage_boot_offset[]={{FLASH_OFFSET_ONENAND,  "onenand",  "OneNAND Flash",},{FLASH_OFFSET_NAND, "nand",     "NAND Flash",   },{FLASH_OFFSET_NOR,  "nor",      "NOR Flash",    },{FLASH_OFFSET_SATA, "sata",     "SATA Disk",    },{FLASH_OFFSET_SD,   "sd",       "SD Card",  },{FLASH_OFFSET_SPI,  "spi",      "SPI Flash",    },{FLASH_OFFSET_QSPI, "qspi",     "QSPI NOR Flash",},{-1,            "",     "Invalid",  },
};staticvoidparse_cfg_cmd(structimx_header*imxhdr,int32_t cmd,char*token,char*name,intlineno,intfld,intdcd_len)
{intvalue;staticintcmd_ver_first=~0;switch(cmd){caseCMD_IMAGE_VERSION:imximage_version=get_cfg_value(token,name,lineno);......set_hdr_func();break;caseCMD_BOOT_FROM:imximage_ivt_offset=get_table_entry_id(imximage_boot_offset,......break;caseCMD_BOOT_OFFSET:imximage_ivt_offset=get_cfg_value(token,name,lineno);......break;......}
}

    printf("\n--------------------------------------\n");printf("tag:        0x%04x\n", (uint8_t)fhdr_v2->header.tag);printf("length:     0x%04x\n", (uint16_t)fhdr_v2->header.length);printf("version:    0x%04x\n", (uint8_t)fhdr_v2->header.version);printf("\n");printf("entry:         0x%08x\n", (uint32_t)fhdr_v2->entry);printf("reserved1:     0x%08x\n", (uint32_t)fhdr_v2->reserved1);printf("dcd_ptr:       0x%08x\n", (uint32_t)fhdr_v2->dcd_ptr);printf("boot_data_ptr: 0x%08x\n", (uint32_t)fhdr_v2->boot_data_ptr);printf("self:          0x%08x\n", (uint32_t)fhdr_v2->self);printf("csf:           0x%08x\n", (uint32_t)fhdr_v2->csf);printf("reserved2:     0x%08x\n", (uint32_t)fhdr_v2->reserved2);printf("\n");printf("db start:      0x%08x\n", (uint32_t)db->start);printf("db size:       0x%08x\n", (uint32_t)db->size);printf("db plugin:     0x%08x\n", (uint32_t)db->plugin);printf("--------------------------------------\n\n");