Link-Time Driver Polymorphism for Memory-Efficient Embedded OS Images
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Solution Overview
Problem
Existing OS integration methods for embedded systems are inefficient due to memory and processing constraints, requiring substantial additional code and developer knowledge of specific device drivers, which becomes untenable with diverse client devices.
Innovation Solution
Automatically generating driver bindings and instances from a device tree, using databases of hardware source code to include only necessary drivers in the OS image, optimizing calls between OS and drivers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If device drivers are integrated at run-time, then the OS can support multiple hardware configurations, but memory usage and processing overhead increase due to extra selection logic and pointer dereferences
Solution Approach 1:
The patent applies preliminary action by performing driver binding at compile-time rather than run-time. The system pre-generates binding code that directly references the specific driver implementation based on the target hardware configuration, eliminating the need for run-time driver selection logic and pointer dereferences while maintaining hardware adaptability through targeted compilation.
2Quantity of substance
If device drivers are integrated at compile-time, then memory usage is reduced, but OS developer productivity decreases due to pollution of hardware-agnostic code with hardware-specific references
Solution Approach 1:
The patent applies segmentation by separating hardware-agnostic OS code from hardware-specific driver bindings. The build system automatically generates binding code that links the core OS to specific drivers based on target hardware, keeping the main OS codebase clean and hardware-independent while still achieving compile-time integration benefits.
Solution Approach 2:
The patent uses an automated build system as an intermediary that translates hardware descriptions into binding code. This intermediary handles the complexity of integrating hardware-specific references, allowing developers to work with hardware-agnostic code while the build system automatically generates the necessary hardware-specific bindings.
3Quantity of substance
If device drivers are integrated at link-time, then some efficiency is achieved, but developer time increases due to manual driver identification and precise name instantiation
Solution Approach 1:
The patent applies self-service by enabling the build system to automatically identify and bind the correct drivers based on hardware descriptions provided in device trees or configuration files. The system self-configures the driver bindings without requiring developers to manually specify driver names or configurations, eliminating precision requirements and reducing developer time investment.
4Measurement precision
If manual driver configuration is required, then precise driver selection is possible, but the approach becomes untenable as device variety increases
Solution Approach 1:
The patent applies universality by creating a standardized binding mechanism that works across diverse hardware configurations. The system uses universal hardware description formats (such as device trees) and automated binding generation that adapts to different hardware types, maintaining precise driver selection through standardized interfaces rather than manual configuration.
Data Source
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AI summary
Specific images of an OS are built using only the driver bindings that are necessary to link the OS to the particular hardware of a client device. A device tree of the client device is analyzed to identify the hardware components. Databases of different hardware source code for various hardware drivers are maintained and used to craft the driver bindings and instances for the hardware of the client device. The device tree is also analyzed to identify compatibility strings of the various hardware on the client device. The hardware source code is searched for these compatibility strings to see if a driver exists in the databases of hardware source code. Specific driver bindings and driver instances with the actual variable names and configuration parameters of the identified hardware drivers are then generated and included in an image of the OS that may be installed on the client device.