Kernel parameters
The kernel parameters are in form of an ASCII text string of up to 895 characters. If the boot device is tape or the z/VM® reader, the string can also be encoded in EBCDIC.
Individual kernel parameters are single keywords or keyword/value pairs of the form keyword=<value> with no blank. Blanks are used to separate consecutive parameters. The configuration file, zipl.conf, has a man page.
If you use the zipl command to prepare your boot device, you can provide kernel parameters on the command line, in a parameter file, and in a zipl configuration file.