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gdbserver can't run over serial

Hi

	Firstly gdb connected with gdbserver, then gdbserver was silent.
Remotebaud was 9600 and remotedevice was /dev/ttyS0. I set debug remote 1
and see lots of msg. But I don't understand it at all. Belowed is snapshot

./gdbserver /dev/ttyS0 hellogdb
Process hellogdb created; pid = 245
Remote debugging using /dev/ttyS0

============================================
(gdb) n
9               printf("hello the world\n");
(gdb) set debug remote 1
(gdb) n
Sending packet: $m100002a8,4#89...Ack
Packet received: 7c290b78
Sending packet: $M100002a8,4:7d821008#71...Ack
Packet received: OK
Sending packet: $m10000414,4#57...Ack
Packet received: 3d201000
Sending packet: $M10000414,4:7d821008#3f...Ack
Packet received: OK
Sending packet: $s#73...Ack
Packet received: T0501:7ffffdc0;40:10000424;
Sending packet: $s#73...Ack
Packet received: T0501:7ffffdc0;40:10000428;
Sending packet: $s#73...Ack
Packet received: T0501:7ffffdc0;40:100109a0;
Sending packet: $m100109a0,4#89...Ack
Packet received: 4bee3678
Sending packet: $m1001099c,4#94...Ack
Packet received: 4bffffcc
Sending packet: $m100109a0,4#89...Ack
Packet received: 4bee3678
Sending packet: $m1001099c,4#94...Ack
Packet received: 4bffffcc
Sending packet: $g#67...Ack
Packet received:
100004207ffffdc03001377010000824300170000000000a0000000100000000300180001000
0000000000007ffffd3022000022100189480000000000000000000000000000000000000000
00000000000000000000000000000000000000000ffecd180ffecd1800000001100004003002
6c387ffffe780ffea9287ffffdc0000000000000000000000000000000000000000000000000
0000000000000000000000000000000000000000000000000000000000000000000000000000
0000000000000000000000000000000000000000000000000000000000000000000000000000
0000000000000000000000000000000000000000000000000000000000000000000000000000
0000000000000000000000000000000000000000000000000000000000000000000000000000
0000000000000000000000000000000000000000000000000000000000000000000000000000
0000000000000000000000000000000000000000000000000000000000000000000000000000
00000000100109a00000d032220000221000042c0ff04a880000000000000000
Sending packet: $m1000042c,4#87...Ack
Packet received: 3d201000
Sending packet: $m10000428,4#5c...Ack
Packet received: 48010579
Sending packet: $m1000042c,4#87...Ack
Packet received: 3d201000
Sending packet: $m10000428,4#5c...Ack
Packet received: 48010579
Sending packet: $m10000400,4#52...Ack
Packet received: 9421ffe0
Sending packet: $m10000404,4#56...Ack
Packet received: 7c0802a6
Sending packet: $m10000408,4#5a...Ack
Packet received: 93e1001c
Sending packet: $m1000040c,4#85...Ack
Packet received: 90010024
Sending packet: $m10000410,4#53...Ack
Packet received: 7c3f0b78
Sending packet: $m10000414,4#57...Ack
Packet received: 7d821008
Sending packet: $m7ffffdc0,4#93...Ack
Packet received: 7ffffde0
Sending packet: $m1000042c,4#87...Ack
Packet received: 3d201000
Sending packet: $M1000042c,4:7d821008#6f...Ack
Packet received: OK
Sending packet: $c#63...Ack
Packet received: T0501:7ffffdc0;40:1000042c;
Sending packet: $m10000428,4#5c...Ack
Packet received: 48010579
Sending packet: $m10000428,4#5c...Ack
Packet received: 48010579
Sending packet: $m10000400,4#52...Ack
Packet received: 9421ffe0
Sending packet: $m10000404,4#56...Ack
Packet received: 7c0802a6
Sending packet: $m10000408,4#5a...Ack
Packet received: 93e1001c
Sending packet: $m1000040c,4#85...Ack
Packet received: 90010024
Sending packet: $m10000410,4#53...Ack
Packet received: 7c3f0b78
Sending packet: $m10000414,4#57...Ack
Packet received: 7d821008
Sending packet: $m7ffffdc0,4#93...Ack
Packet received: 7ffffde0
Sending packet: $g#67...Ack
Packet received: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 packet: $m1000042c,4#87...Ack
Packet received: 7d821008
Sending packet: $M1000042c,4:3d201000#5b...Ack
Packet received: OK
Sending packet: $m100002a8,4#89...Ack
Packet received: 7d821008
Sending packet: $M100002a8,4:7c290b78#a9...Ack
Packet received: OK
Sending packet: $m10000414,4#57...Ack
Packet received: 7d821008
Sending packet: $M10000414,4:3d201000#2b...Ack
Packet received: OK
10              printf("please show me\n");

I run the program step by step, but gdbserver display nothing just halt on
Remote debugging using /dev/ttyS0. But if I quit gdb. The gdbserver will
quit too. 

Thx,
Xi
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