Attributes for ccw

Red Hat Enterprise Linux 9.2 LPAR mode z/VM guest KVM guest

You can find the attributes for re-IPL type ccw in the /sys/firmware/reipl/ccw sysfs directory.

device: Device number of the re-IPL device. For example 0.0.7412 or 0.1.5119.
loadparm: Up to eight characters for the loadparm used to select the boot configuration in the zipl menu (if available).
parm: A 64-byte string of kernel parameters that is concatenated to the boot command-line. The PARM parameter can be set only for Linux® on z/VM®.
A leading equal sign (=) means that the existing kernel parameter line in the boot configuration is ignored and the boot process uses the kernel parameters in the parm attribute only.
clear: A flag that controls memory clearing for a reboot from the device. Valid values are 1 to clear memory during the boot process, or 0 to omit clearing memory during the boot process. Booting without clearing memory is faster and it is the default.
With memory clearing enabled, all hotplug memory is offline after the reboot. Without memory clearing, the online status of hotplug memory is preserved.