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BLE Large Image OAD例子中的xcl文件的疑问



http://processors.wiki.ti.com/index.php/BLE_Large_Image_OAD
上面的wiki中包含了一个示例代码,大致也看明白了,但是有一点关于ImageB的xcl文件没搞明白。
ImageB的xcl文件部分内容如下

  1. -D_CODE_BEG=0x4030             // Last 10 pages of Bank 0.
  2. -D_CODE_END=0x7FFF
  3. -Z(CODE)CHECKSUM=0x3000-0x3001
  4. -Z(CODE)IMAGE_HEADER=0x3002-0x300F
  5. -Z(CODE)AES_HEADER=0x3010-0x302F
疑问时为什么CHECKSUM以及IMAGE_HEADER等为什么放置在0x3000开始的地方,而不是0x4000开始的地方?