1.1.2 License File

Microchip Technology uses the public key received in the license request file to protect the customer secrets hidden in the generated license file. Only one license file is provided for each product family.

To enable the secure boot mode of SAMA5D3 and SAMA5D4 families, the SAM-BA Loader tool requires an encrypted secure mode message file to be sent to the device. On SAM-BA versions prior to 3.5, this file was generated by Secure SAM-BA Cipher. To improve security, Microchip removed this feature in version 3.5 and provides those encrypted secure mode message files aside the license file.

For SAMA5D3 devices, since the license is dedicated to SAMA5D3 and SAMA5D3_nk products, Microchip provides the files “secure_mode_sama5d3x.cip” and “secure_mode_sama5d3x_nk.cip” with the license file. These files must be provided to SAM-BA 3.5 when executing the “enable_secure” command. SAM-BA Loader sends the file corresponding to the version of the connected device.