topic Secure boot in Imx8m in i.MX Processors

Secure boot in Imx8m

ravindrajinka88 — Fri, 17 Jan 2020 09:24:03 GMT

1- Using Single CST tool howmany times we can generate different Keys?

2- In Imx8m OTP fuses are used to store the keys, here on generic question is that once i programmed the fuses, i cant use it for second time programming. so in this case im thinking that we are going to lost the security updates related keys. is it correct? or how we are overcoming the security updates related keys?

3- Is there any optional memory for OTP fuses to store keys for development purpose. because once we programmed we cant use it for second time.

Thanks in advance.

Re: Secure boot in Imx8m

Yuri — Mon, 20 Jan 2020 08:43:03 GMT

Hello,

Look at my comments below.

I do not know about restrictions using Single CST tool to generate different Keys

many times.

New (updated) customer’s firmware should be signed, based on the same SRKs, which

hashes are burned in OTP.

I am afraid, there are no additional memory for OTP fuses to store keys for development

purpose.

Have a great day,

Yuri.

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Re: Secure boot in Imx8m

ravindrajinka88 — Mon, 20 Jan 2020 12:28:57 GMT

Thank you very much YuriMuhin_ng‌.