uboot启动流程分析3- lowlevel_init

arch/arm/cpu/armv7/lowlevel_init.S, 22行,初始化sp,指向地址CONFIG_SYS_INIT_SP_ADDR,是多少???- - include/configs/mx6ullevk.h arch/arm/include/asm/arch-mx6/imx-regs.h IRAM_BASE_ADDR 是6ULL内部OCRAM地址,可查看参考手册,大小为 0x000
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