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C6748 norflash烧写程序

在烧写程序的cmd文件有一段话  我不太明白是什么意思麻烦ti工程师解释下

.extram

{

  .+ =0x000400000;

}load =DRAM,FILL =0x0000000,type =DSECT,START(_EXTERNAL_RAM_START),END(_EXTERNAL_RAM_END),SIZE(_EXTERNAL_RAM_SIZE)

我不明白的就是 .+ =0x000400000;这句话说的意思是什么呢?是代表_EXTERNAL_RAM_SIZE的大小还是说从DRAM加上0x000400000开始START呢?