Failed to make encrypt amlogic vim3

[Jaehoon Chung]

Dear Neil

I have a question about vim3 board.
When i have build with mainline u-boot, i have faced on below problem.
(I have referred to doc/board/amlogic/khadas-vim3.rst)


Do you know why failed like below?

$fip/aml_encrypt_g12b --bl2sig --input fip/bl2_new.bin --output fip/bl2.n.bin.sig 
fip/aml_encrypt_g12b bl2sig fail[15208]!

Best Regards,
Jaehoon Chung