Re: [Qemu-devel] Suggested Wiki Update

[Christian Borntraeger]

Looks good to me. I somehow lost my wiki password, so maybe Conny can do the
update until this is fixed....

On 09/12/2017 10:57 AM, Viktor Mihajlovski wrote:
> Hi,
> 
> the content of https://wiki.qemu.org/index.php/Features/S390xNetworkBoot
> is slightly outdated since proper DHCP based netboot support for s390x
> has been implemented by the series ending with commit 29d1221.
> 
> As it is still desirable to provide some instructions on building
> network bootable images for the s390x architecture, I'd like to suggest
> that the text is replaced (see proposal below). Conny, could I once more
> request your help in that matter?
> 
> == Building a s390 network bootable binary ==
> 
> Since 2.10 QEMU offers network boot support which allows to load a
> binary from a TFTP server and boot it. As s390 network bootable images
> are not very common, this document gives a brief overview on how to
> build one.
> 
> A s390 network bootable image can be built by bundling some shell
> scripts, busybox and the kexec binary bundled into an initial ramdisk
> and append that to a kernel image. An existing s390 system can be used
> as source.
> 
> One way to do that is to take a kernel and an installer initial ramdisk
> from a distribution's DVD/ISO and concatenate them. Some fixups are
> necessary int the new binary, which can be done by using the script in
> [https://github.com/ibm-s390-tools/s390-tools/blob/master/netboot/mk-s390image].
> Booting this image would then start the installation process as if
> booted from the DVD.
> 
> Another possible way is to build a binary that behaves similar to the
> PXELINUX boot loader. In this case an initial ramdisk with an init
> process triggering the PXELINUX-like processing has to be built as
> described in
> [https://github.com/ibm-s390-tools/s390-tools/tree/master/netboot]. The
> site also contains a script assisting in the creation of such an initial
> ramdisk.
>