topic FUSE programming in imx8 M mini in i.MX Processors

FUSE programming in imx8 M mini

anushan — Tue, 21 Jan 2020 07:08:42 GMT

Hello Everyone,

I want to implement Secure Boot using HABv4 on the imx8mm evk. So it is required to program the FUSE with a private key. I have studied the documentation on the FUSE spec on imx6 using fuse banks, but in imx8 the FUSE does not have banks and is in the form of arrays of word, Kindly share sufficient documentation or example script where uuu is used to program the FUSE with private key in imx8.

Thank you

Regards,

Anusha

Re: FUSE programming in imx8 M mini

igorpadykov — Tue, 21 Jan 2020 09:17:09 GMT

Hi Anusha

one can look at

OCOTP write support on i.mx8m

Understanding how to burn eFuses on i.MX8 and i.MX8x families - i.MXDev Blog

Best regards
igor
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Re: FUSE programming in imx8 M mini

anushan — Tue, 21 Jan 2020 10:59:05 GMT

Hi Igor,

I have following doubts,

1. Does the uboot source code in android_p9.0.0_2.0.0-ga BSP have the driver for the OCOTP? If so, then where is it?

2. Is it possible to program the eFuse through uboot?

3. If we are programming the eFuse through uuu , what are the bank and row index numbers to be accessed to program the key for secure boot using HABv4?

Re: FUSE programming in imx8 M mini

igorpadykov — Tue, 21 Jan 2020 11:12:14 GMT

Hi Anusha

yes it is possible to program fuses with uboot, driver:

mxc_ocotp.c\misc\drivers - uboot-imx - i.MX U-Boot

Best regards
igor