mirror of
https://github.com/AsahiLinux/u-boot
synced 2024-12-17 08:43:07 +00:00
efe19295a5
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
|
||
-----------------------------
|
||
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.
|