超级终端OK335X的命令行卡在了最后一行有大佬能帮帮我吗

我的开发板是OK335XD的商业版，我将开发板用串口线连到电脑，然后上电使用SD卡或者Nand启动，超级终端OK335X的命令行都出不来，直接卡在了最后一行，打印结果如下图所示

然后我又尝试用1ON 2ON启动打印如下

CCCCCCCC
Texas Instruments Windows CE NAND X-Loader for SubArctic AM335X
Built Jul 10 2018 at 17:29:58
Version BSP_WINCE_ARM_A8 02.30.00.01
This XLDR
o copies image file from NAND to RAM
o starts execution of the image file in RAM
BEFORE
FMD_Init succeeded
FMD_GetInfo succeeded
Retrieving EBOOT from flash memory ...
Reading block 0x00000004
vvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvv.
Reading block 0x00000005
vvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvv.
Jumping to bootloader EBOOT @ 0x8FE00000
Microsoft Windows CE Bootloader Common Library Version 1.4 Built Jul 10 2018 17:26:35
INFO:OALLogSetZones: dpCurSettings.ulZoneMask: 0x8409
Texas Instruments Windows CE EBOOT For EVB335X, Built Jul 10 2018 at 17:29:43
EBOOT Version 0.0.1, BSP BSP_WINCE_ARM_A8 02.30.00.01
ecc type:3
System ready!
Preparing for download...
INFO: Predownload....
Checking bootloader blocks are marked as reserved (Num = 28)
INFO: Boot configuration found. Boot config Version 3, Signature 1111705159
OALFlashStoreOpen: 2048 blocks, 64 sectors/block
OALFlashStoreOpen: 2048 bytes/sector, 28 reserved blocks