iMX8M Plus Processor: Factory settings for lock fuses

Paul_51 — Wed, 28 May 2025 16:47:12 GMT

We've observed that several of the lock fuses (e.g. BOOT_CFG_LOCK) at address 0x400 are shipped from your factory with override protection (OP) already set. These fuses are shown in Table 5-3 (p 173) of the Security Reference Manual (Document number IMX8MPSRM, Rev 0, 04/2021).

1. Can you assure us the iMX8M Plus processors we receive will always have overwrite protection already set? The response that joanxie posted on 12-16-2022 says BOOT_CFG_LOCK has always been programmed to 0x10 (OP protection set) but it doesn't say if this will continue to be the case.

2. What happens if you write to a fuse to set OP protection but it's already set? We want to set OP + WP protection for BOOT_CFG_LOCK in our products.

Thanks,

Paul

Re: iMX8M Plus Processor: Factory settings for lock fuses

Harvey021 — Fri, 30 May 2025 06:09:14 GMT

I've replied back to you in system email. Please let me know over there if further question.

Regards

Harvey

topic Re: iMX8M Plus Processor: Factory settings for lock fuses in i.MX Processors

iMX8M Plus Processor: Factory settings for lock fuses

Re: iMX8M Plus Processor: Factory settings for lock fuses