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uboot执行大致流程 reset(arch\arm\cpu\armv7\start.S)=>_main (arch\arm\lib\crt0.S) => board_init_f (arch\arm\lib\board.c) => board_init_r (arch\arm\lib\board.c)
初始化调用函数在数组init_sequence中定义,这个数组在board_init_f 被依次调用执行,其中包括调用dram_init进行DDR的初始化,dram_init见board\ti\ks2_evm\board_k2hk.c.