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关于ramfuncs的疑问

请问我在看map文件的时候发现我里面有一个显示(ramfuncs:retain)请问这个retain是什么意思?有什么不同?谢谢!!!

ramfuncs 0 00320000 00000183 RUN ADDR = 00008000
00320000 000000cf SVM.obj (ramfuncs)
003200cf 00000075 DSP2833x_DefaultIsr.obj (ramfuncs:retain)
00320144 00000020 qsin.obj (ramfuncs)
00320164 0000001b DSP2833x_SysCtrl.obj (ramfuncs)
0032017f 00000004 DSP2833x_usDelay.obj (ramfuncs)