急！！C6743 DSP UART BOOT 在勾选Wait for BOOTME选项时出现以下错误，而在不勾选此选项时有时正常有时出现I/O Error in read！错误，不知道是什么原因啊？？？？？

(File IO): Read 5940 bytes from file G:\DSP\MEMS3\flash_SPI\sdram\Debug\11.bin.
(Serial Port): Opening COM1 at 115200 baud...
(AIS Parse): Read magic word 0x41504954.
(AIS Parse): Waiting for BOOTME... (power on or reset target now)
(Serial Port): Read error! (The operation has timed out.)
(AIS Parse): Read invalid BOOTME string.
(AIS Parse): Boot aborted.
(Serial Port): Closing COM1.

补充下：是不是在上电后只能传输一次.bin文件一次，如果在不断电情况下重新传输.bin文件，出现以下错误：

(File IO): Read 5940 bytes from file G:\DSP\MEMS3\flash_SPI\sdram\Debug\11.bin.
(Serial Port): Opening COM1 at 115200 baud...
(AIS Parse): Read magic word 0x41504954.
(AIS Parse): Performing Start-Word Sync...
(Serial Port): Read error! (The operation has timed out.)
(AIS Parse): I/O Error in read!
(AIS Parse): Boot aborted.
(Serial Port): Closing COM1.