2023-05-17 07:17:16 +00:00
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Field Fail-Save U-Boot Update
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2021-12-10 10:07:53 +00:00
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Field Fail-Save u-boot update is a feature that allows save u-boot update
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of FOX and XMC products that are rolled out in the field.
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The feature is initially implemented for designs based on LS102x SoC, but in
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theory can be used on all designs that are booting from parallel NOR flash.
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The implementation expects redundant (secondary) u-boot image on a predefined
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location in the NOR flash, u-boot execution will be transferred to the redundant
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(secondary) u-boot and redundant u-boot will be started if 'updateduboot' envvar
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is set to 'yes'.
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Update logic check_for_uboot_update() has to be invoked from the design early
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before relocation just after SoC initialization, e.g from board_early_init_f or
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misc_init_f functions.
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By design it is expected that primary u-boot image is burned in the factory and
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never updated, and in case u-boot update is required it can flashed and started
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from secondary u-boot location.
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