OK6410 uboot1.1.16/lib.arm的board.c相關函數分析（C語言執行的第一個函數start_armboot）

在分析該函數之前，首先貼兩個圖

貼上相關代碼

void start_armboot (void)
{
 init_fnc_t **init_fnc_ptr;
 char *s;
#ifndef CFG_NO_FLASH
 ulong size;
#endif

#if defined(CONFIG_VFD) || defined(CONFIG_LCD)
 unsigned long addr;
#endif

#if defined(CONFIG_BOOT_MOVINAND)
 uint *magic = (uint *) (PHYS_SDRAM_1);
#endif

 /* Pointer is writable since we allocated a register for it */
#ifdef CONFIG_MEMORY_UPPER_CODE /* by scsuh */
 ulong gd_base;

 gd_base = CFG_UBOOT_BASE + CFG_UBOOT_SIZE - CFG_MALLOC_LEN - CFG_STACK_SIZE - sizeof(gd_t);
#ifdef CONFIG_USE_IRQ
 gd_base -= (CONFIG_STACKSIZE_IRQ+CONFIG_STACKSIZE_FIQ);
#endif
 gd = (gd_t*)gd_base;
#else
 gd = (gd_t*)(_armboot_start - CFG_MALLOC_LEN - sizeof(gd_t));
#endif

 /* compiler optimization barrier needed for GCC >= 3.4 */
 __asm__ __volatile__("": : :"memory");

 memset ((void*)gd, 0, sizeof (gd_t));
 gd->bd = (bd_t*)((char*)gd - sizeof(bd_t));
 memset (gd->bd, 0, sizeof (bd_t));

 monitor_flash_len = _bss_start - _armboot_start;

 for (init_fnc_ptr = init_sequence; *init_fnc_ptr; ++init_fnc_ptr) {
  if ((*init_fnc_ptr)() != 0) {
   hang ();
  }
 }

#ifndef CFG_NO_FLASH
 /* configure available FLASH banks */
 size = flash_init ();
 display_flash_config (size);
#endif /* CFG_NO_FLASH */

#ifdef CONFIG_VFD
# ifndef PAGE_SIZE
#   define PAGE_SIZE 4096
# endif
 /*
  * reserve memory for VFD display (always full pages)
  */
 /* bss_end is defined in the board-specific linker script */
 addr = (_bss_end + (PAGE_SIZE - 1)) & ~(PAGE_SIZE - 1);
 size = vfd_setmem (addr);
 gd->fb_base = addr;
#endif /* CONFIG_VFD */

#ifdef CONFIG_LCD
# ifndef PAGE_SIZE
#   define PAGE_SIZE 4096
# endif
 /*
  * reserve memory for LCD display (always full pages)
  */
 /* bss_end is defined in the board-specific linker script */
 addr = (_bss_end + (PAGE_SIZE - 1)) & ~(PAGE_SIZE - 1);
 size = lcd_setmem (addr);
 gd->fb_base = addr;
#endif /* CONFIG_LCD */

 /* armboot_start is defined in the board-specific linker script */
#ifdef CONFIG_MEMORY_UPPER_CODE /* by scsuh */
 mem_malloc_init (CFG_UBOOT_BASE + CFG_UBOOT_SIZE - CFG_MALLOC_LEN - CFG_STACK_SIZE);
#else
 mem_malloc_init (_armboot_start - CFG_MALLOC_LEN);
#endif

#if defined(CONFIG_SMDK6400) || defined(CONFIG_SMDK6410) || defined(CONFIG_SMDK6430) || defined(CONFIG_SMDK2450) || defined(CONFIG_SMDK2416)

#if defined(CONFIG_NAND)
 puts ("NAND:    ");
 nand_init();  /* go init the NAND */
#endif

#if defined(CONFIG_ONENAND)
 puts ("OneNAND: ");
 onenand_init();  /* go init the One-NAND */
#endif

#if defined(CONFIG_BOOT_MOVINAND)
 puts ("SD/MMC:  ");

 if ((0x24564236 == magic[0]) && (0x20764316 == magic[1])) {
  printf("Boot up for burning/n");
 } else {
  movi_set_capacity();
  movi_set_ofs(MOVI_TOTAL_BLKCNT);
  movi_init();
 }
#endif

#else

#if (CONFIG_COMMANDS & CFG_CMD_NAND)
 puts ("NAND:    ");
 nand_init();  /* go init the NAND */
#endif

#endif

#ifdef CONFIG_HAS_DATAFLASH
 AT91F_DataflashInit();
 dataflash_print_info();
#endif

 /* initialize environment */
 env_relocate ();
 
#ifdef CONFIG_VFD
 /* must do this after the framebuffer is allocated */
 drv_vfd_init();
#endif /* CONFIG_VFD */

 /* IP Address */
 gd->bd->bi_ip_addr = getenv_IPaddr ("ipaddr");

 /* MAC Address */
 {
  int i;
  ulong reg;
  char *s, *e;
  char tmp[64];

  i = getenv_r ("ethaddr", tmp, sizeof (tmp));
  s = (i > 0) ? tmp : NULL;

  for (reg = 0; reg < 6; ++reg) {
   gd->bd->bi_enetaddr[reg] = s ? simple_strtoul (s, &e, 16) : 0;
   if (s)
    s = (*e) ? e + 1 : e;
  }

#ifdef CONFIG_HAS_ETH1
  i = getenv_r ("eth1addr", tmp, sizeof (tmp));
  s = (i > 0) ? tmp : NULL;

  for (reg = 0; reg < 6; ++reg) {
   gd->bd->bi_enet1addr[reg] = s ? simple_strtoul (s, &e, 16) : 0;
   if (s)
    s = (*e) ? e + 1 : e;
  }
#endif
 }

 devices_init (); /* get the devices list going. */

#ifdef CONFIG_CMC_PU2
 load_sernum_ethaddr ();
#endif /* CONFIG_CMC_PU2 */

 jumptable_init ();

 console_init_r (); /* fully init console as a device */

#if defined(CONFIG_MISC_INIT_R)
 /* miscellaneous platform dependent initialisations */
 misc_init_r ();
#endif

 /* enable exceptions */
 enable_interrupts ();

 /* Perform network card initialisation if necessary */
#ifdef CONFIG_DRIVER_CS8900
 //cs8900_get_enetaddr (gd->bd->bi_enetaddr);
#endif

#if defined(CONFIG_DRIVER_SMC91111) || defined (CONFIG_DRIVER_LAN91C96)
 if (getenv ("ethaddr")) {
  smc_set_mac_addr(gd->bd->bi_enetaddr);
 }
#endif /* CONFIG_DRIVER_SMC91111 || CONFIG_DRIVER_LAN91C96 */

 /* Initialize from environment */
 if ((s = getenv ("loadaddr")) != NULL) {
  load_addr = simple_strtoul (s, NULL, 16);
 }
#if (CONFIG_COMMANDS & CFG_CMD_NET)
 if ((s = getenv ("bootfile")) != NULL) {
  copy_filename (BootFile, s, sizeof (BootFile));
 }
#endif /* CFG_CMD_NET */

#ifdef BOARD_LATE_INIT
 board_late_init ();
#endif
#if (CONFIG_COMMANDS & CFG_CMD_NET)
#if defined(CONFIG_NET_MULTI)
 puts ("Net:     ");
#endif
 eth_initialize(gd->bd);
#endif
 /* main_loop() can return to retry autoboot, if so just run it again. */
 for (;;) {
  main_loop ();
 }

 /* NOTREACHED - no way out of command loop except booting */
}

接下來就該分析該函數了，太晚了，明天繼續，哈哈