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Diffstat (limited to 'board/keymile/README')
| -rw-r--r-- | board/keymile/README | 18 |
1 files changed, 18 insertions, 0 deletions
diff --git a/board/keymile/README b/board/keymile/README new file mode 100644 index 0000000..4e5cfb1 --- /dev/null +++ b/board/keymile/README @@ -0,0 +1,18 @@ +Field Fail-Save U-boot Update +----------------------------- +Field Fail-Save u-boot update is a feature that allows save u-boot update +of FOX and XMC products that are rolled out in the field. + +The feature is initially implemented for designs based on LS102x SoC, but in +theory can be used on all designs that are booting from parallel NOR flash. + +The implementation expects redundant (secondary) u-boot image on a predefined +location in the NOR flash, u-boot execution will be transferred to the redundant +(secondary) u-boot and redundant u-boot will be started if 'updateduboot' envvar +is set to 'yes'. +Update logic check_for_uboot_update() has to be invoked from the design early +before relocation just after SoC initialization, e.g from board_early_init_f or +misc_init_f functions. +By design it is expected that primary u-boot image is burned in the factory and +never updated, and in case u-boot update is required it can flashed and started +from secondary u-boot location. |