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试一下链接内的方法 http://supp.iar.com/Support/?Note=95811
谢谢，搞定了，原来是版本兼容问题，V8.20 or older and in V8.30是不能自动全部兼容的。但这里所说的 .xcl文件，在哪里找出来呢：
Solution:The .xcl file in your project probably comes from EW8051 V8.20 or older and it contains:-Z(DATA)VREG+_NR_OF_VIRTUAL_REGISTERS=08-7FMake a new copy of the file if needed and change that line to:-Z(DATA)VREG=08-7F
