我在AT91SAM7S64上移植UCOS时出现连接警告，是哪里的问题？
出问题的代码部分：
AREA RESET, CODE, READONLY
ARM
EXTERN OS_CPU_ARM_ExceptUndefInstrHndlr
EXTERN OS_CPU_ARM_ExceptSwiHndlr
EXTERN OS_CPU_ARM_ExceptPrefetchAbortHndlr
EXTERN OS_CPU_ARM_ExceptDataAbortHndlr
EXTERN OS_CPU_ARM_ExceptIrqHndlr
EXTERN OS_CPU_ARM_ExceptFiqHndlr
; Exception Vectors
; Mapped to Address 0.
; Absolute addressing mode must be used.
; Dummy Handlers are implemented as infinite loops which can be modified.
Vectors B Reset_Handler
LDR PC,=OS_CPU_ARM_ExceptUndefInstrHndlr
LDR PC,=OS_CPU_ARM_ExceptSwiHndlr
LDR PC,=OS_CPU_ARM_ExceptPrefetchAbortHndlr
LDR PC,=OS_CPU_ARM_ExceptDataAbortHndlr
B .
LDR PC,=OS_CPU_ARM_ExceptIrqHndlr
LDR PC,=OS_CPU_ARM_ExceptFiqHndlr
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