vivi main函数

int main(int argc, char *argv[])
{
    int ret;

    GPFDAT = 0x10;
    /* NB: MMU off state */
    /*
     * Step 1:
     * print banner
     */
    putstr("\r\n");
    putstr(vivi_banner);

    reset_handler();

    /*
     * Step 2:
     * Board initialize
     */
    ret = board_init();
    GPFDAT = 0x20;
    if (ret) {
        putstr("Failed a board_init() procedure\r\n");
        error();
    }

    /*
     * Step 3:
     * 4G linear mapping, flash mapping
     * MMU on
     */
    mem_map_init();
    mmu_init();
    putstr("Succeed memory mapping.\r\n");


    /*
     * Now, vivi is running on the ram. MMU is enabled.
     */

    /*
     * Step 4:
     * dynamic memory can be used in bootloader
     */
    /* initialize the heap area*/
    ret = heap_init();
    if (ret) {
        putstr("Failed initailizing heap region\r\n");
        error();
    }

    /* Step 5:
     * MTD initialize
     * read MTE partition info.
     */
    ret = mtd_dev_init();

    /* Step 6:
     * read bootloader parameter
     */
    init_priv_data();

    /* Step 7:
     * misc treatment
     */
    misc();

    init_builtin_cmds();

// putstr("Change Speed from 400Mhz to 533Mhz\r\n");

// change_sys_clks(533,5);

    /* Step 8:
     * boot or vivi.
     */
    boot_or_vivi();

    return 0;
}


在main函数中，条理非常的清晰，一步一步来（一共八步）

下面我们就按照main函数中的顺序来一次分析各个步骤