Re: Help building debian-installer for arm64

[Karsten Merker <merker@debian.org>]

On Fri, Jan 12, 2018 at 01:52:39PM +0100, Loys Ollivier wrote:
> On 26/12/2017 22:05, Karsten Merker wrote:
> > On Tue, Dec 26, 2017 at 05:13:26PM +0100, Loys Ollivier wrote:

> I have been able to build the d-i natively and boot from it. Thanks for
> the help with that. The problem is, my kernel is still missing some
> modules.
> 
> > Regarding the kernel udebs: those are created by the Debian
> > kernel package. A package built with "make deb-pkg" from within
> > an upstream kernel tree only builds regular debs, but no udebs.
> > To have udebs for a custom kernel, you should start from the
> > Debian kernel package sources and modify them as needed for
> > your custom kernel.
> > 
> > The Debian kernel package repository is available at
> > https://anonscm.debian.org/git/kernel/linux.git.
> > Please note that this repository only contains the packaging
> > part, not the upstream kernel sources.
> > 
> > For how to use that with an upstream kernel source, please
> > read
> > 
> >   https://anonscm.debian.org/git/kernel/linux.git/tree/debian/README.source?h=sid
> > 
> 
> I have been able to build a Debian kernel using your tools. But I think
> I am missing something... I followed
> https://kernel-handbook.alioth.debian.org/ch-common-tasks.html#s-common-official
> section 4.3.
> I did "make deb-pkg" and got linux kernel deb packages but still no
> udebs. I did not find in the documentation how to create those udebs.
> 
> I guess once I have them I will be able to rebuild the d-i with my
> custom kernel.

Hello,

"make deb-pkg" uses a function of the upstream kernel Makefile to
build .deb packages. This function doesn't support building udebs;
udebs are only built by the Debian kernel package build infrastructure,
which is in debian/rules (and is called by dpkg-buildpackage).

To build a Debian kernel package including udebs from git, run
the following steps:

$ sudo apt-get install build-essential fakeroot rsync git
$ sudo apt-get build-dep linux
$ git clone -b sid --single-branch https://anonscm.debian.org/git/kernel/linux.git
  (this gets you the Debian packaging files for a kernel package)
$ cd linux
$ ./debian/bin/genorig.py /path/to/local/linux-kernel-git-repository
  (this creates a DFSG-free upstream kernel tarball for the kernel version
   defined by the newest entry in debian/changelog from an upstream
   kernel git repository)
$ debian/rules orig
  (this unpacks the upstream kernel tarball in the right place for
   the package build process)
$ debian/rules debian/control
  (this creates the final control file for building the
   package from a template)
$ dpkg-buildpackage -us -uc -rfakeroot -B
  (this runs the actual binary package build, using the control
   file generated in the previous step)

For building the package from a custom kernel source, create a new
changelog entry that fits your custom kernel in debian/changelog and
replace /path/to/local/linux-kernel-git-repository with the path to
your custom kernel repository.  If you are working on a bleeding-edge
kernel source (i.e. 4.15rc), you should use the "master" branch of
https://anonscm.debian.org/git/kernel/linux.git instead of the "sid"
branch as your base.

HTH,
Karsten
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