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printf can not work without JTAG plugged out

Posted: Thu Feb 04, 2016 2:36 am
by linuxjiahuo
I use the board and the printf can work via a COM port. But I find that only the printf can work whith the JTAG plugged in. After I plug out the JTAG, I can see nothing on the COM port,but I'm sure the program is running!
Any one meet this?