topic Re: Recovery/Redundant boot and HAB in i.MX Processors

Recovery/Redundant boot and HAB

maffan — Wed, 15 Nov 2023 06:29:14 GMT

If I've understood the reference manual (IMX8MMRM) correctly, SPI NOR recovery boot only kicks in if the SoC can't find a valid IVT on the selected boot device. If HAB verification fails however, PERSIST_SECONDARY_BOOT is set, and upon reset the SoC will try to find a secondary boot image on the same boot device.

Is there a way to have the SoC go into SPI NOR recovery boot upon HAB failure, or do we have to implement both recovery boot and redundant boot to be able to rescue our device in all cases?

Re: Recovery/Redundant boot and HAB

Harvey021 — Fri, 17 Nov 2023 09:04:58 GMT

SoC can go into SPI NOR recovery boot before SDP upon HAB failure if SPI NOR set.

Best regards

Harvey

Re: Recovery/Redundant boot and HAB

maffan — Fri, 17 Nov 2023 14:22:54 GMT

Thanks for your response @Harvey021 !

What do you mean with "if SPI NOR set"? Do you mean the "Recovery boot enable" eFUSE, or the "Boot device selection" BOOT_CFG eFUSEs, or something else?

Kind Regards

Re: Recovery/Redundant boot and HAB

Harvey021 — Mon, 20 Nov 2023 07:37:38 GMT

sorry for the "if SPI NOR set", by default, SPI NOR should be used as a recovery boot device, if the correct image is in it. It will not enter download mode.

Regards

Harvey