To ensure compatibility with later releases and reliable support for the current release, every driver should be Solaris 7 DDI/DKI compliant. One way to determine if the driver is compliant is by inspection. The driver can be visually inspected to ensure that only kernel routines and data structures specified in Sections 9F and 9S of the Solaris 2.7 Reference Manual are used.
The Solaris 7 Driver Developer Kit (DDK) includes a DDI compliance tool (DDICT) that checks device driver C source code for non-DDI/DKI compliance and issues either error or warning messages when it finds non-compliant code. For best results, all drivers should be written to pass DDICT.