_main

 

ENTRY(_main)
 
/*
 * Set up initial C runtime environment and call board_init_f(0).
 */
 
#if defined(CONFIG_SPL_BUILD) && defined(CONFIG_SPL_STACK)
    ldr    r0, =(CONFIG_SPL_STACK)
#else
    ldr    r0, =(CONFIG_SYS_INIT_SP_ADDR)
#endif
    bic    r0, r0, #7    /* 8-byte alignment for ABI compliance */
    mov    sp, r0
    bl    board_init_f_alloc_reserve
    mov    sp, r0
    /* set up gd here, outside any C code */
    mov    r9, r0
    bl    board_init_f_init_reserve
 
    mov    r0, #0
    bl    board_init_f
 
#if ! defined(CONFIG_SPL_BUILD)
 
/*
 * Set up intermediate environment (new sp and gd) and call
 * relocate_code(addr_moni). Trick here is that we'll return
 * 'here' but relocated.
 */
 
    ldr    r0, [r9, #GD_START_ADDR_SP]    /* sp = gd->start_addr_sp */
    bic    r0, r0, #7    /* 8-byte alignment for ABI compliance */
    mov    sp, r0
    ldr    r9, [r9, #GD_BD]        /* r9 = gd->bd */
    sub    r9, r9, #GD_SIZE        /* new GD is below bd */
 
    adr    lr, here
    ldr    r0, [r9, #GD_RELOC_OFF]        /* r0 = gd->reloc_off */
    add    lr, lr, r0
#if defined(CONFIG_CPU_V7M)
    orr    lr, #1                /* As required by Thumb-only */
#endif
    ldr    r0, [r9, #GD_RELOCADDR]        /* r0 = gd->relocaddr */
    b    relocate_code
here:
/*
 * now relocate vectors
 */
 
    bl    relocate_vectors
 
/* Set up final (full) environment */
 
    bl    c_runtime_cpu_setup    /* we still call old routine here */
#endif
#if !defined(CONFIG_SPL_BUILD) || defined(CONFIG_SPL_FRAMEWORK)
# ifdef CONFIG_SPL_BUILD
    /* Use a DRAM stack for the rest of SPL, if requested */
    bl    spl_relocate_stack_gd
    cmp    r0, #0
    movne    sp, r0
    movne    r9, r0
# endif
    ldr    r0, =__bss_start    /* this is auto-relocated! */
 
#ifdef CONFIG_USE_ARCH_MEMSET
    ldr    r3, =__bss_end        /* this is auto-relocated! */
    mov    r1, #0x00000000        /* prepare zero to clear BSS */
 
    subs    r2, r3, r0        /* r2 = memset len */
    bl    memset
#else
    ldr    r1, =__bss_end        /* this is auto-relocated! */
    mov    r2, #0x00000000        /* prepare zero to clear BSS */
 
clbss_l:cmp    r0, r1            /* while not at end of BSS */
#if defined(CONFIG_CPU_V7M)
    itt    lo
#endif
    strlo    r2, [r0]        /* clear 32-bit BSS word */
    addlo    r0, r0, #4        /* move to next */
    blo    clbss_l
#endif
 
#if ! defined(CONFIG_SPL_BUILD)
    bl coloured_LED_init
    bl red_led_on
#endif
    /* call board_init_r(gd_t *id, ulong dest_addr) */
    mov     r0, r9                  /* gd_t */
    ldr    r1, [r9, #GD_RELOCADDR]    /* dest_addr */
    /* call board_init_r */
#if CONFIG_IS_ENABLED(SYS_THUMB_BUILD)
    ldr    lr, =board_init_r    /* this is auto-relocated! */
    bx    lr
#else
    ldr    pc, =board_init_r    /* this is auto-relocated! */
#endif
    /* we should not return here. */
#endif
 
ENDPROC(_main)