Hi Xiaoqiang,
Sorry for late reply. About building the manufacturing tool image, in the yocto you can refer to the 6.2 The Manufacturing Tool in the Freescale_Yocto_Project_User's_Guide.pdf, MFGTool:
To build a manufacturing image do the following
$ bitbake fsl-image-mfgtool-initramfs
If you are using the LTIB, you can refer to the user guide document.
Hope this can help you.
Have a great day,
Dan
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