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s390x architecture uses zipl as bootloader. When used in combination
with the vm element it replaces the existing bootloader element.
It's mandatory for s390x vm images.
Use cases
---------
* Allow users to create s390x images that run on nova with s390x
libvirt/kvm backend
* Building nodepool images for s390x third party CI
Supported Distros
-----------------
The following listing shows all Distros that officially support
s390x and how those Distros are supported in DIB with this patch.
* SLES - not supported (SLES is not supported in DIB)
* RHEL - not suppoprted (RHEL is not supported as KVM guest on s390x,
therefore there's no rhel7 qcow image for s390x available
like it is for other archictectures)
* Ubuntu - supported
Ubuntu images can for example be built using the following commands:
$ disk-image-create ubuntu-minimal zipl vm
$ disk-image-create ubuntu-minimal zipl
$ disk-image-create ubuntu zipl vm
Testing
-------
Cross architecture building of s390x images is not supported so far.
The plan is to set up a ThirdParty CI that builds the image for s390x and
provides the logs.
Co-Authored-By: Andreas Scheuring <andreas.scheuring@de.ibm.com>
Co-Authored-By: Holger Smolinsky <holger@smolinski.name>
Co-Authored-By: Zhiguo Deng <bjzgdeng@linux.vnet.ibm.com>
Co-Authored-By: Arne Recknagel <arne.recknagel@hotmail.com>
Closes-Bug: #1730641
Change-Id: I576e7edda68da12e97c60af38f457915efe7b934
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==========
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zipl
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==========
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Zipl is the bootloader for s390x.
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This element installs zipl on the base device holding the /boot directory on the system.
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It's mandatory for building s390x images. It replaces the `bootloader` element
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(which would install grub2 by default).
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This element has been tested with `ubuntu` and `ubuntu-minimal` distro.
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Arguments
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=========
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* ``DIB_ZIPL_DEFAULT_CMDLINE`` sets the CMDLINE parameters that
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are appended to the zipl.conf parameter configuration. It defaults to
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'LANG=en_US.UTF-8 console=ttyS0 console=ttyS1'
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