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TMS320C6657: 关于CSL(csl_bootcfgAux.h)中有关LED的几个函数是用于何功能的?

Part Number: TMS320C6657

如题.
CSL(csl_bootcfgAux.h)中有若干个与“LED”有关的函数,如:
CSL_BootCfgLockLEDPLL()
CSL_BootCfgGetLEDPassDoneStatus()
CSL_BootCfgGetLEDChipPassDoneStatus()
请问这些函数中的LED具体指的是什么?由何用处?
665x相关的手册里没有找到有关信息。
多谢!