z/OS V1R7.0-V1R12.0 MVS Device Validation Support
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Testing UIMs During IPL

z/OS V1R7.0-V1R12.0 MVS Device Validation Support
SA22-7586-01

Certain errors in UIMs might cause a wait state code during IPL. Such errors can, of course, only be tested during IPL.

If an error occurs, analyze the problem according to z/OS HCD User's Guide, then correct it.

Note:
To test the UIM, do not link it into SYS1.NUCLEUS. Instead, before testing the UIM, link it to another library and concatenate that library to the HCD load libraries. Specify that library on the UIM_LIBNAME parameter in the HCD profile statement.
UIM_LIBNAME=Name of data set containing the UIMs
All UIMs (and UDTs) are loaded from the specified data set (SYS1.NUCLEUS is the default)
UIM_LIBNAME=*
The UIMs are contained in the HCD load libraries. In this case, the data set containing the new UIM and SYS1.NUCLEUS containing the existing UIMs must be concatenated to the HCD load libraries using STEPLIB/JOBLIB statements.
Test the UIM as described in Testing UIMs.

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