MCU BootUtility, fuse spaces in gray

[vanessa_dis]

Hi 
I just have a quick question, I scanned the efuses from my board in MCUBootUtility, i would like to know what does it mean the grey spaces?

Can I write in this fuses?

Thank you

[jeremyzhou · Accepted solution]

Hi,
Thank you for your interest in NXP Semiconductor products and for the opportunity to serve you.
1) I would like to know what does it mean the grey spaces?
-- These grey spaces mean the fuse areas are reserved for NXP internal (and future) use only. Customers must not attempt to burn these, because the IC behavior may be unpredictable. The reserved fuses can be read as either '0' or '1'.
Hope this is clear.
TIC

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[vanessa_dis]

Thank your aswer

I just have other question..

I want to configure Secure JTAG, but the spots where we must burn are in grey. For example, the spot for key is in grey.

so can we burn those spots?

[jeremyzhou]

Hi,
Thanks for your reply.
To provide the fastest possible support, I'd highly recommend you refer to the application note to enable the Secure JTAG feature.
Have a great day,
TIC

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[vanessa_dis]

Yes, I'm using that application note, but what I mean is that here where the key must be configured is in grey 

So, there is a way to know what value is here? And can I write in these fuses?

Thanks

[jeremyzhou]

Hi,
Thanks for your reply.
Firstly, I'd like to know the time the grey background start to appear, as it doesn't exist on my tool (as the below figure shows), next, can you share the lock value in the Fuse map just like the below figure shows, as I guess you may blow some Lock bits, if yes, it blocks read or write some fuse areas.

Have a great day,
TIC

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[vanessa_dis]

Thank you for your help.

Yes... I've heard about it.

The thing is that this place is also hidden. I read a little about OTG, that it have functions and I could read this values. Is it possible? Just to confirm. Or what do you think I should do?

Or is it a fact that when it appears in shadow/grey, the fuses cannot be reading and writing anymore?

Thanks

Vanessa

[jeremyzhou]

Hi,
Thanks for your reply.
1) What do you think I should do?
-- I'd like to suggest you refer to the application note to try to read the fuse map.
Have a great day,
TIC

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