Why the initrd_flash can encrypt the disk without SBKPKC mode

Hi I read the disk_encryption_helper.func ,it seems generate the unique-pass,if we want use the generic-pass how modify the func.
And if it possible to prepare the tow keys for luks_keyslot as I kown the cryptset can set 8 key for one partition does it can do this?
BTW,as u last tell me the ECID can be get through the command :

sudo ./bootloader/tegrarcm_v2 --uid

but why I see the tegrarcm_v2 --help it shows --uid Prints UID of chip

thank u
2022-05-18 11-23-39 的屏幕截图