Software Compatibility - Texas Instruments OMAP5910 Technical Reference Manual

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1.6 Software Compatibility

OMAP Driver Compatibility Conventions

Code compatibility with future OMAP59x devices is only possible if driver

writers adhere to the conventions detailed in Section 1.6.1.

All locations marked as reserved or unused in the documentation are written

as zero, and, in general, values read from reserved locations are not used.

In practice, read-mask-update operations can be applied to registers that

include reserved bits, provided the register is initialized by writing 0 to all

reserved bits when the register is first used.

These conventions allow use of reserved bits to enable new features in future

implementations. Initialization of the complete register, including reserved

bits, is required to avoid problems in these future devices when a new driver

uses (sets) some of the previously reserved bits. In this case, a following

legacy driver must clear the bits.

All software that comes into contact with hardware registers in OMAP devices

must follow these conventions.

Software Compatibility

Introduction