Attributes for ccw

SUSE Linux Enterprise Server 15 SP5 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).

If the re-IPL target kernel is SUSE Linux® Enterprise Server 12 or later, the specification must be of the form <n>g<grub_parameters>, where

<n>

selects the kernel to be booted.

0 or 1: immediately starts GRUB 2 for booting the target kernel.
2: boots a rescue kernel.

If you omit this specification, GRUB 2 is started after a timeout period has expired.

<grub_parameters>

specifies parameters for GRUB 2. Typically, this specification selects a boot option from a GRUB 2 boot menu. For details, see Specifying GRUB 2 parameters.

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 scp_data attribute only.

Important:

If the re-IPL kernel is SUSE Linux Enterprise Server 12 or later, be sure not to specify kernel parameters that prevent the target kernel from booting.
In particular, do not use a leading equal sign if the re-IPL kernel is SUSE Linux Enterprise Server or later.

See Avoid parameters that break GRUB 2.

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.