Test secure boot without locking the e-fuse

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Test secure boot without locking the e-fuse

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Hardevsinh_Palaniya
Contributor III

Processor : i.MX8M mini
OS : Yocto Zeus
u-boot : u-boot-2020.04
Kernel : 5.4.47

Hi,
I am implementing secure boot on i.MX8M mini and completed all configurations with High Assurance Boot (HAB) and compilation done. I would like to test it on a test board  without writing e-fuse permanently.

Is it possible to test secure boot (with HAB) without locking e-fuse?  How can i do that? can you give me any related docs?

Any help will be appreciated.

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2 Replies

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Harvey021
NXP Employee
NXP Employee

Hi @Hardevsinh_Palaniya 

No, We can't test secure boot without programming fuse.  But We don't need to close device.

Best regards

Harvey

 

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Hardevsinh_Palaniya
Contributor III

Hi @Harvey021 
Thanks for your reply.
I know that I can not test secure boot without programming fuse.  According to the https://community.nxp.com/t5/i-MX-Processors/eFUSE-Question/m-p/511419/highlight/true#M83385 ,  I can't revert the fuse once I write 1 to the fuse bit. If it is so, there is a chance of losing one hardware.
Is there any possibility of reversing the fuse after testing?

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