HAB 'close' on iMX6UL

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HAB 'close' on iMX6UL

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colinhelliwell
Contributor III

I've been using an iMX6S on my platform, and have successfully created a signed U-Boot, blown the HAB fuses, and 'closed' the device. But when I perform the same fuse steps on an iMX6UL, I'm unable to close the device. The security fuses themselves (bank 3, word 0-7) read back ok and there are no HAB Events, but when I do 'fuse prog –y 0 6 0x00000002' (to close the device), U-Boot is throwing a 'usage' error. 

(NB - I've also first attempted to disable the JTAG with 'fuse prog –y 0 6 0x00100000')

Is the 'close' fuse in a different place on the UL?

Thanks.

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Yuri
NXP TechSupport
NXP TechSupport

Hello,

 

  If there is no HAB even found, you can program fuse SEC_CONFIG[1] to 1

to enable Closed Configuration. The command is

 

$ echo 0x2 > /sys/fsl_otp/HW_OCOTP_CFG5

 

It corresponds “fuse prog 0 6 0x2” of U-boot.

 

  For the early i.MX6UL chip, OTPMK fuse is not programmed, so even there is no HAB event in Open Configuration, the signed u-boot can't bootup in Close Configuration. You can check OTPMK_ZERO in SNVS HPSR register, if it's 1, OTPMK is not programmed.

 


Have a great day,
Yuri

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