本人是个初学者也是个爱完美的人，在调试下面程序的时候遇到3个warning，哪位高人可以帮忙讲解一下，十分感谢！！
ORG 0000H
AJMP START
ORG 0030H
START:
MOV A,#01H
MAIN:
JB P1.0,$
JNB P1.0,$;1 0 1
MOV P2,A
RL A
JB P1.0,$
JNB P1.0,$;1 0 1
MOV P2,A;
RL A
AJMP MAIN
END
*** WARNING L5: CODE SPACE MEMORY OVERLAP
*** WARNING L5: CODE SPACE MEMORY OVERLAP
FROM:
0000H
TO:
0002H
*** WARNING L1: UNRESOLVED EXTERNAL SYMBOL
SYMBOL:?C_START
MODULE:STARTUP.obj (?C_STARTUP)
*** WARNING L2: REFERENCE MADE TO UNRESOLVED EXTERNAL
SYMBOL:?C_START
MODULE:STARTUP.obj (?C_STARTUP)
ADDRESS: 0050H
a3，拜托了，不知道就别乱说啊！！
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