Can the linux  boot up without arm-trusted-firmware if the trustzone is not necessary ?

Hi experts,

     I am trying to boot the linux by my bootloader which is running on EL3 level.(switch to EL1 when I jump to the kernel)

     The trustzone is not necessay for me, so I don't want to use it.

     However, I'm comfused if the arm-trusted-firmware is needed?

     Some boards like Juno and Hikey  have used the arm-trusted-firmware .   

Regards,

Jorney

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