iMX6 fuse override

[jaysmith]

Hello.

I read in the chip manual about fuse and shadow registers, and I've also noticed the "fuse override" uboot command.

But I still have a question I couldn't understand the answer to:

If I write the wrong value to the MAC fuses by writing to /sys/fsl_otp/HW_OCOTP_MAC*, is there any way to override it with another MAC address?

(I know I can write to it again and change zero bits to ones, but is there a way to change ones to zeros, maybe by using the shadow registers?)

Thanks in advance.

[igorpadykov]

Hi Jay

>I write the wrong value to the MAC fuses by writing to /sys/fsl_otp/HW_OCOTP_MAC*,

>is there any way to override it with another MAC address?

no. "fuse override" uboot command override just the shadow register,
this operation doesn't affects the fuses, so it's the same after a reset.
This command may be useful for testing purposes.

For changing mac address also one can try fec.macaddr boot parameter described

in Table 11. Common kernel boot parameters attached Release Notes.

Best regards
igor
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