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• PSM (Persistent Storage Manager) component is responsible for the storage of default/system configurations.
• Provides software interfaces and abstractions to read/write variables stored in persistent storage and read factory config variables.
• PSM holds mainly parameters related to hardware configuration.
• In dual processor architecture a process running in peer processor can access PSM DB over DBUS.
• All defaults/system configuration which are not modified during runtime are part of PSM.
• PSM should be up and running for normal configuration of RDKB unit.
• For WiFi initialization, PSM holds all default values of OEM specific custom parameters which is fetched through PSM HAL.

Architecture

Figure 1 - Architectural view of PSM sub-system

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/nvram/bbhm_bak_cfg.xml

/nvram/bbhm_cur_cfg.xml

Factory reset removes the configuration files from nvram and copies default file to nvram.

 To prevent system configuration file from becoming corrupted or lost when the device is suddenly rebooted or power loss conditions, following counter-measures are in place:

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