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→Linux-based upgrading
* When preparing the root file system, it's fundamental to add all the application binaries and libraries required to implement the upgrade procedures.
* It's always possible to access the u-boot environment variables from user space, both for read and write operations. These operations can be performed using the '''fw_printenv/fw_setenv ''' programs contained in the tools/env directory of the u-boot sources.
* In some cases, the upgrade procedures can be activated automatically: