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因为在cpu/arm926ejs/davinci的Makefile中有
ifndef CONFIG_SKIP_LOWLEVEL_INIT
SOBJS += lowlevel_init.o
endif
而在include/configs/da850evm.h中有定义
#define CONFIG_SKIP_LOWLEVEL_INIT
所以cpu/arm926ejs/davinci/lowlevel_init.S就没有编译进去,因而与UBL中的DDR设置不冲突