The plug-in framework supports two methods to prevent a RAM based plug-in from overriding a ROM based plug-in. The first method is to use the ROM-only resolver and the second method is to explicitly prevent a ROM-based implementation from being overridden by a RAM-based implementation.
Using the ROM-only resolver restricts the search of the framework plug-ins to the ROM only.
Alternatively, to prevent a RAM-based implementation from overriding a ROM-based implementation, set the rom_only variable to 1 in the resource registration file for the implementation.
If an installable upgrade to a ROM-based plug-in is correctly supplied by a vendor, then the ROM-only resolver finds and uses the upgrade. Platform security controls are used to ensure that the upgrade is secure. For details, see How to upgrade ROM-based plug-ins securely.
If the ROM-based plug-ins must be prevented from being overridden by a RAM-based plug-in, use the version 2 resource file format .
In the .rss file, the rom_only member of the IMPLEMENTATION_INFO structure must be set to 1.
rom_only set to 1 indicates the ROM-based implementation must be used.
rom_only set to 0 indicates the ROM-based implementations can be overridden.
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