RM0319 datasheet(39/368 Pages) STMICROELECTRONICS

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RM0319

BootROM

Doc ID 022640 Rev 3

39/368

5.5.4

X-Loader and U-Boot header

typedef struct image_header

{

uint32_t ih_magic; /* Image Header Magic Number */

uint32_t ih_hcrc; /* Image Header CRC Checksum */

uint32_t ih_time; /* Image Creation Timestamp */

uint32_t ih_size; /* Image Data Size */

uint32_t ih_load; /* Data Load Address */

uint32_t ih_ep; /* Entry Point Address */

uint32_t ih_dcrc; /* Image Data CRC Checksum */

uint8_t ih_os; /* Operating System */

uint8_t ih_arch; /* CPU architecture */

uint8_t ih_type; /* Image Type */

uint8_t ih_comp; /* Compression Type */

uint8_t ih_name[IH_NMLEN]; /* Image Name */

} image_header_t;

5.5.5

X-Loader and U-Boot authentication

At the next phase, X-Loader and U-Boot authentication is done by:

●

Comparing the value of the Boot_Strap_Reg (address 0xB3000000) to select the boot

mode

●

Comparing the magic number in received header with 0x27051956.

●

Checking the CRC of the image header and image received with the CRCs present in

the header.

5.6

Boot flows

A diagrammatic representation of the boot flow is given below. A detailed explanation of

each boot flow is explained in further sections:

●

Serial NOR Flash

●

UART0

●

BootROM Bypass

●

Parallel NAND Flash

●

USB upgrade

●

Parallel NOR Flash

●

Ethernet

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