On Sat, Jan 24, 2026 at 06:54:52AM +0100, Heiko Schocher wrote: >From: Adrian Freihofer <[email protected]> > >With ENV_WRITEABLE_LIST only specific environment variables lisetd in >CFG_ENV_FLAGS_LIST_STATIC are read from the u-boot environment storage. >All other environment variables are set to default values and are not >written back to the storage. > >The u-boot environment usually stays for the lifetime of the product. >There is no A/B copy mechanism as for the firmware itself. That means >that incompatible changes to environment variables in future u-boot >versions may lead to serious issues if the old environment is used with >a new u-boot version or vice versa. > >Having this protection in place ensures that only a limited set of >environment variables are persisted across u-boot versions. All the >macros not listed in CFG_ENV_FLAGS_LIST_STATIC are now part of the >u-boot binary which is redundant and immutable. This guarantees that >the u-boot version and the default values of these environment variables >are always in sync and cannot be changed at runtime. > >ustate and rastate are not relevant for u-boot itself. ustate is used >by swupdate which persists the transaction state in the environment. >rastate is a similar variable used by another user space application. > >Signed-off-by: Adrian Freihofer <[email protected]> >Signed-off-by: Heiko Schocher <[email protected]>
Reviewed-by: Peng Fan <[email protected]>
