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CCS/66AK2G12: Unable to open FATFS filesystem

Part Number: 66AK2G12

Tool/software: Code Composer Studio

Dear Sir,

Currently, We develop our product using 66AK2G12, And debug the firmware update from uSD.

So we are trying to our firmware update via uSD card.

But there is an issue same as below.

e2e.ti.com/.../771878

The issue happened like below.
①we set the bootmode is uSD boot.
②The rom bootloader read from the secondly bootloader from uSD.
③The secondly bootloader can not the app from uSD.

We think that the uSD hardware is no problem, because ② is no problem.
Please tell me the reason this issue happen, and What should we investigate?