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This article explain shows the layout of partitions in-system program image file, ISPBOOOT.BIN, of SP7350 and explains each partition in the file.

Internal ROM code of SP7350 will search for the file named ISPBOOOT.BIN in root directory of SD card if “boot from SD card” is setup by boot-switch of SP7350, or in root directory of USB flash drive if “boot from USB flash drive” is setup by boot-switch of SP7350. Once found the file, it loads the first-stage boot loader, called x-boot, from it and store to SRAM. The x-boot image is at offset 0 of ISPBOOOT.BIN and its size is 192 KiB at maximum. Actual size is recorded in header of x-boot image. If checksum is verified pass, it then jumps to run x-boot.

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Partitions	Offset	Size	Descriptions
xboot0	0	192 kB	image of x-boot, including training firmware of DDR
uboot0	0x30000	1344 kB	image of U-Boot
file_header	0x180000	16 kB	header for the following partitions
xboot	0x184000	actual size	image of x-boot, including training firmware of DDR
uboot1		actual size	image of U-Boot
uboot2		actual size	image of U-Boot
fip		actual size	image of fip, including TF-A and OP-TEE
env		actual size	image of environment variable of U-Boot
env_redund		actual size	image of environment variable of U-Boot (redundant)
dtb		actual size	image of device-tree blob (not used)
kernel		actual size	image of Linux kernel with U-Boot header
rootfs		actual size	image of root file-system
isp_script_nand		actual size	script of U-Boot for NAND in-system program
isp_script_emmc		actual size	script of U-Boot for eMMC in-system program
isp_script_nor		actual size	script of U-Boot for SPI-NOR in-system program

Refer to code below for definition of partition_info in the file_header.

Code Block

#define SIZE_FILE_NAME      (32)
struct partition_info_s {
	u08 file_name[SIZE_FILE_NAME];  // file name of source (basename only)
	u08 md5sum[36];
	u32 file_offset;                // offset in output file
	u64 file_size;                  // file size of the partition
	u32 partition_start_addr;       // partition's start address in NAND, there will be an offset added in U-Boot script ($isp_nand_addr_1st_part), less than 4GB is expected.
	u64 partition_size;             // reserved size for this partition, less than 4GB is expected.
	u32 flags;
	u32 emmc_partition_start;       // Unit: block
	u32 reserved[7];                // let size of this structure == SIZE_PARTITION_INFO_S
} __attribute__((packed));

Refer to code below for definition of file_header.

Code Block

#define SIZE_PARTITION_INFO_S           (128)
#define SIZE_INIT_SCRIPT                (2048)
#define NUM_OF_PARTITION                (111)
struct file_header_s {
	u08 signature[32];
	u08 init_script[SIZE_INIT_SCRIPT];
	u32 flags;
	u08 reserved[SIZE_PARTITION_INFO_S - 36];

	struct partition_info_s partition_info[NUM_OF_PARTITION];
} __attribute__((packed));          // sizeof(this structure) == 16384

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