imx6ull cannot blow SRK fuse

[LoongX]

Hi,
    I want to use secure boot and consult the relevant documentation. The tutorial says to just enter the command, but an error occurs when I enter it.

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MX6ULL > fuse prog 3 0 0x1431D1EF
Programming bank 3 word 0x00000000 to 0x1431d1ef...
Warning: Programming fuses is an irreversible operation!
This may brick your system.
Use this command only if you are sure of what you are doing!

Really perform this fuse programming? <y/N>
y
mxc_ocotp fuse_prog(): Access protect error
ERROR

[Harvey021]

Hi,

Please try to check if the SRK_LOCK is fused. 

and try to read what the current value it is.

Regards

Harvey