U-Boot image CPU ARM

Title : How to write bootloader from scratch.

Re-studying the boot loader ....

#define IH_OS_LINUX  5 /* Linux */

#define IH_CPU_ARM  2 /* ARM  */

LA LA LA HA HA HA HA : Magic number : 

#define IH_MAGIC 0x27051956 /* Image Magic Number  */

Lol looks like a birthday date : 27th May 1956. 

Abooo U-boot header : 

typedef struct uboot_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  */
} uboot_image_header_t;