IBM SY44-5902-05 manual Licensed Internal Code LIC initialization, Abnormal ending

vIPL parameters

–IPL mode

–Switch setting

–Power control status

–Power-on cause

vSystem vital product data (VPD)

vTime of day

Abnormal ending

The service processor ends an IPL when a condition is detected that prevents the base machine from doing work. If an IPL stops, an SRC appears on the control panel, and the System Attention light goes on. The SRC indicates the failing condition.

Licensed Internal Code (LIC) initialization

Functions performed

The following list is a high-level description of the functions that are performed by Licensed Internal Code during an IPL:

1.Licensed Internal Code sets the internal processing unit registers and arrays necessary to run Licensed Internal Code.

2.When initialization is complete, Licensed Internal Code signals the service processor of the event.

3.Licensed Internal Code enters the disabled state (task dispatcher is disabled). Once the service processor starts the processing unit, the earlier constructed queue is made ready. The Licensed Internal Code then does its normal work-time functions.

See “IPL status SRCs” on page 201 for information that is displayed on the control panel during an IPL.

Abnormal ending

Licensed Internal Code ends an IPL when a condition is detected that prevents the machine from doing work. The service processor sends the correct SRC to the control panel.

Conditions that cause Licensed Internal Code initialization to fail are:

vLicensed Internal Code hangs (loops or waits), causing a Licensed Internal Code initialization time-out. The processor gives control to the service processor which, in turn, ends the IPL.

vLicensed Internal Code that is not compatible with the control storage.

Some of the Licensed Internal Code is in main storage in an area that is known as the Licensed Internal Code overlay area. If this code is not compatible with resident code in control storage, the IPL might end during the Licensed Internal Code initialization phase.

vBad data on file.

If bad data is not detected when read from the file but is detected by the Licensed Internal Code initialization routine, the IPL ends with an SRC. If bad data is on the file, use the Main storage dump manager option from the Start a Service Tool display under DST to save the main storage dump to removable media. You must install the Licensed Internal Code again to correct this problem. If the system does not complete an IPL after initializing the Licensed Internal Code again, the Licensed Internal Code tape is bad.

Chapter 7. Initial Program Load (IPL) Information 219