TDA4VM-Q1: OTP keywriter question

Hi Hannah,

Hannah Park said:

#8 (KEYWR_ERR_PARSE_FEK, Error in parsing TI FEK (appended to TIFS binary, before encryption): May I know the detail of this item?

You shouldn't really be experiencing this error. The TI FEK (Factory Encryption Key) is is used to encrypt the keys being written. The TIFS KeyWriter binary has the counter-part of the FEK embedded that is used to decrypt the keys before programming into the eFuses. 

You can refer to the TI-SCI KeyWriter Procedure section that shows the usage of the encryption of the Keywriting fields using the TI FEK Public Key.

The stock public RTOS SDK does not come with the TI FEK and TIFS KeyWriter binary, these are provided as an Add-On NDA package. There is a blank KeyWriter binary that is used to ensure there are no build errors, but this needs to be replaced with the actual TIFS KeyWriter binary.

Please refer to the PDK 5.17. OTP KEYWRITER section for all details.

Hannah Park said:

What this means and  is this related to SW error for VPU or external signal/DATA input is anomal?

No, this is not related to the VPP_EFUSE voltage. The VPP_EFUSE is required for correctly programming the eFuses, which is the one of the last steps during the KeyWriting process. The certificate needs to be authenticated first.

regards

Suman