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![]() The decision on whether HAB is enabled is solely based on the SEC_CONFIG fuse. The HAB FIELD_RETURN feature is able to permanently disable HAB on a CPU, after which it is able to boot unsigned firmware. U-Boot however does not take into account the FIELD_RETURN mode, and refuses to boot unsigned software when the feature is enabled. Also take the FIELD_RETURN fuse into account when deciding whether HAB is enabled. When The FIELD_RETURN fuse is blown, HAB is not enabled. Tested on i.MX8M Mini, i.MX8M Plus, i.MX8M Nano and i.MX6ULL Signed-off-by: Paul Geurts <paul.geurts@prodrive-technologies.com> |
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