The system was IPLed into a partition that has a non-zero channel subsystem identifier (CSSID) defined. The current level of z/OS® does not support non-zero CSSIDs; the system must be at the z990 exploitation support or above to support non-zero CSSIDs.
The system enters nonrestartable disabled wait state X'07C' with reason code X'1'.
Either IPL the z/OS system in a logical partition with a CSSID of zero, or modify your I/O configuration to define this partition in CSS zero.
Note 9.
1