gtpm1m1p | TPF V4R1 Migration Guide: 3.1 to 4.1 |
The common input/output (I/O) routines now use format-1 channel
control words (CCWs),
which means:
- You must use format-1 CCWs.
- You must convert virtual addresses to real addresses before they can be
used in CCWs.
- If you have user-defined device support routines and user-built CCWs, you
must modify them accordingly.