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https://github.com/AsahiLinux/u-boot
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This patch provides possibility for field fail-safe u-boot updates. The implementation can be used on all pg-wcom boards that are booting from parallel NOR flash. When used in a board design, provided check_for_uboot_update function will start new u-boot at defined location if updateduboot envvar is set to yes. With this implementation it is expected that factory programmed u-boot will always stay as it is, and optionally new u-boot can be safely programmed by embedded software when the unit is rolled out on the field. It is expected check_for_uboot_update to be called early in execution before relocation (*_f) once SoC is basically initialized and environment can be read, with this possibilities to not be able to fix a u-boot bug by a u-boot update are reduced to minimum. Signed-off-by: Aleksandar Gerasimovski <aleksandar.gerasimovski@hitachienergy.com> Reviewed-by: Priyanka Jain <priyanka.jain@nxp.com>
18 lines
980 B
Text
18 lines
980 B
Text
Field Fail-Save U-boot Update
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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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