AM620-Q1: How to signed M4 FW (am62-mcu-m4f0_0-fw) for HS-SE device?

Part Number: AM620-Q1

Tool/software:

Hi, Dear Expert

Customer's AM62 device already become HS_SE.

Once device become HS_SE, I think M4 firmware should be also signed & encryption, isn't?

I try to search some E2E,

https://e2e.ti.com/support/processors-group/processors/f/processors-forum/1266065/sk-am62b-does-processor-sdk-am62x-support-secure-boot-for-m4-firmware?tisearch=e2e-sitesearch&keymatch=signed%25252525252520m4%25252525252520firmware#

https://git.ti.com/cgit/security-development-tools/core-secdev-k3/tree/scripts/secure-binary-image.sh

SDK : linux sdk 10.01.10.04

Could you share some 101 information that how to signed M4 firmware?

Thank You.

Gibbs