Uboot 2015 代码解析2 vectors.S

位于arch/arm/lib/vectors.S文件中存有uboot执行的第一段代码_start。

.globl _start

/*
 *************************************************************************
 *
 * Vectors have their own section so linker script can map them easily
 *
 *************************************************************************
 */

    .section ".vectors", "ax"

/*
 *************************************************************************
 *
 * Exception vectors as described in ARM reference manuals
 *
 * Uses indirect branch to allow reaching handlers anywhere in memory.
 *
 *************************************************************************
 */

_start:

#ifdef CONFIG_SYS_DV_NOR_BOOT_CFG
    .word   CONFIG_SYS_DV_NOR_BOOT_CFG
#endif

    b   reset
...

可以看到它会跳转到reset(位于arch/arm/cpu/armv7/start.S), 关于start.S 请看下一篇博文。