OMAPL138B-EP: NAND的烧写工具求助

请到下面的网站下载软件包，里面有SecureHexAIS_OMAP-L138.exe可以转换成.
http://software-dl.ti.com/dsps/dsps_public_sw/omap_l1x/omapl13x_c674x_generic_secure/latest/index_FDS.html

烧写工具和非加密的一样。
The examples and utilities discussed in this application report can be downloaded from the following URL:
https://www.ti.com/lit/an/spracm8a/spracm8a.pdf

我尝试使用串口烧写工具 ，但是失败，显示信息如下：

sfh_OMAP-L138.exe -flash_noubl -flashType NAND -p COM6 u-boot.bin
-----------------------------------------------------
TI Serial Flasher Host Program for OMAP-L138
(C) 2012, Texas Instruments, Inc.
Ver. 1.67
-----------------------------------------------------

[TYPE] Single boot image
[BOOT IMAGE] u-boot.bin
[TARGET] OMAPL138
[DEVICE] NAND
[NAND Block] 1

Attempting to connect to device COM6...
Press any key to end this program at any time.

(AIS Parse): Read magic word 0x41504954.
(AIS Parse): Waiting for BOOTME... (power on or reset target now)
(AIS Parse): BOOTME received!
(AIS Parse): Performing Start-Word Sync...
(AIS Parse): Performing Ping Opcode Sync...
(AIS Parse): Processing command 0: 0x58535901.
(AIS Parse): Performing Opcode Sync...
(Serial Port): Read error! (操作已超时。)
(AIS Parse): I/O Error in read!
(Serial Port): Read error! (操作已超时。)
(AIS Parse): I/O Error in read!

请尝试用ccs烧写OMAP-L138_FlashAndBootUtils_2_40\OMAP-L138\CCS\NANDWriter