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AM6548: AM6548: Secure boot

Part Number: AM6548
Other Parts Discussed in Thread: TMDX654IDKEVM, TMDX654HSEVM

I currently have a TMDX654IDKEVM, a TMDX654HSEVM and a TQMa65xx by TQ-Systems.

I am currently working on a project that involves a custom AM65xx board, and accessing the secure development package is crucial for the last steps of the BSP development.
I'm talking about something referred by the u-boot documentation for TI Secure Boot (see https://github.com/ARM-software/u-boot/blob/master/doc/README.ti-secure)
Quoting:

> Information on the details on the complete boot image format can be obtained
> from Texas Instruments. The tools used to generate boot images for secure
> devices are part of a secure development package (SECDEV) that can be
> downloaded from: > www.ti.com/mysecuresoftware (login required)

Additionally I found the following TI e2e forum post:
https://e2e.ti.com/support/processors-group/processors/f/processors-forum/832626/am6548-secure-boot

My questions are the same of the aforementioned forum post.