It is useful to specify glob patterns in platform files to select device
tree sources. When switching development branches, some patterns may not
match any file. The shell expands those patterns to themselves, which
causes build failures. Fix this by setting the nullglob option, to make
those patterns expand to a null string.

Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>

Make it possible to build device tree sources only, separately from the
kernel image.

Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>

The -m option to the DT checks catches additional errors.

Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>

The --no-dt, --no-image and --no-modules options have incorrectly been
added to the help text. Remove them.

Fixes: e7385853e45b ("kbuild: Add options to selectively compile kernel components")
Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>

Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>

It's useful to build a FIT image with DTBs stored outside of the kernel
tree, for instance to test vendor-supplied DTBs. Support this by
allowing DTB paths to be absolute. Compilation of the DTB is skipped in
that case.

Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>

The kbuild.sh script strips the directory name from the DTB destination.
This is correct when no destination is specified explicitly, as we want
to strip the directory name of the source for arm64 platforms where DT
sources are stored in per-vendor directories. However, in some cases, we
want to store the DTB in a sub-directory. A common use case is Raspberry
Pi platforms that store overlays in an overlays/ subdirectory.

Make this possible by stripping the directory name only when the
destination is implicit.

Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>

Require matches for the directory pattern to be a full directory name,
to reduce the risk of false matches.

Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>

Introduction of the kernel component selection build option broke DT
build. Fix it.

Fixes: e7385853e45b ("kbuild: Add options to selectively compile kernel components")
Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>

This is required to merge overlays, as the base DTB needs to be
relocated. Only the base address needs to be specified by platforms,
addresses for all DTBs are calculated automatically.

Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>