[U-Boot] [PATCH v2 00/10] uboot overlays, FIT image & unittest

[Pantelis Antoniou]

This patchset allows uboot to handle overlays in a manner that uses
a base DT blob and an arbitrary number of DT overlays blobs.

While it is intended to be used with FIT images since handling a multitude
of device tree blobs manually is a chore, manual fdt overlay application
is supported and described.

The first 2 patches have already been accepted in DTC mainline.
We can apply them now, or expect the updated drop from mainline.

The next patch contains the FIT FDT blob generation logic as well
as documentation about how it works. 

Path #4 spits out an informative message in case of an overlay
failure that may be attribute to mis-compilation (which is
a common problem).

Patches 5 & 6 are documentation entries.

Patch #7 makes sure unit tests using overlays can be used on
non-sandbox boards.

Patch #8 adds overlay unit tests as part of sandbox's defconfig.

Patch #9 fixes a problem with unit tests using an already
present symbol.

Finally, #10 adds a unit test using a stacked overlay.

The patchset is available at

	https://github.com/pantoniou/u-boot/tree/uboot-overlays

and is against mainline u-boot as pulled today, 11/8/2017.

Franklin S Cooper Jr (1):
  doc: overlays: Tweak documentation regarding overlays

Pantelis Antoniou (9):
  Introduce fdt_setprop_placeholder() method
  fdt: Allow stacked overlays phandle references
  fit: Introduce methods for applying overlays on fit-load
  fdt-overlay: Spit out a descriptive failure warning
  doc: Document how to apply fdt overlays
  dtbo: make dtbos special
  config: sandbox: Add unit tests
  ut: fix fdt_getprop_u32() change
  test: overlay: Add unit test for stacked overlay

 cmd/fdt.c                                    |   8 +
 common/image-fdt.c                           |   7 +-
 common/image-fit.c                           | 226 ++++++++++++++++++++++++--
 configs/sandbox_defconfig                    |   2 +
 doc/README.fdt-overlays                      | 114 ++++++++++++++
 doc/uImage.FIT/command_syntax_extensions.txt |  12 +-
 doc/uImage.FIT/overlay-fdt-boot.txt          | 225 ++++++++++++++++++++++++++
 doc/uImage.FIT/source_file_format.txt        |   6 +-
 include/image.h                              |  10 ++
 lib/libfdt/fdt_overlay.c                     | 228 ++++++++++++++++++++++++---
 lib/libfdt/fdt_rw.c                          |  20 ++-
 lib/libfdt/libfdt.h                          |  31 ++++
 scripts/Makefile.lib                         |  17 ++
 test/overlay/Makefile                        |   1 +
 test/overlay/cmd_ut_overlay.c                |  50 ++++--
 test/overlay/test-fdt-overlay-stacked.dts    |  21 +++
 16 files changed, 926 insertions(+), 52 deletions(-)
 create mode 100644 doc/README.fdt-overlays
 create mode 100644 doc/uImage.FIT/overlay-fdt-boot.txt
 create mode 100644 test/overlay/test-fdt-overlay-stacked.dts

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2.1.4