Since the state module holds references to all the device trees used by
binman, it must be updated when the device trees are updated. Add support
for this.

Signed-off-by: Simon Glass <sjg@chromium.org>

Sometimes an entry may shrink after it has already been packed. In that
case we must repack the items. Of course it is always possible to just
leave the entry at its original size and waste space at the end. This is
what binman does by default, since there is the possibility of the entry
changing size every time binman calculates its contents, thus causing a
loop.

Signed-off-by: Simon Glass <sjg@chromium.org>

So far we don't allow entries to change size when repacking. But this is
not very useful since it is common for entries to change size after an
updated binary is built, etc.

Add support for this, respecting the original offset/size/alignment
constraints of the image layout. For this to work the original image
must have been created with the 'allow-repack' property.

This does not support entry types with sub-entries such as files and
CBFS, but it does support sections.

Signed-off-by: Simon Glass <sjg@chromium.org>

At present it is not possible to discover the contraints to repacking an
image (e.g. maximum section size) since this information is not preserved
from the original image description.

Add new 'orig-offset' and 'orig-size' properties to hold this. Add them to
the main device tree in the image.

Signed-off-by: Simon Glass <sjg@chromium.org>

While it is useful and efficient to build images in a single pass from a
unified description, it is sometimes desirable to update the image later.

Add support for replace an existing file with one of the same size. This
avoids needing to repack the file. Support for more advanced updates will
come in future patches.

Signed-off-by: Simon Glass <sjg@chromium.org>

In some cases we want to access the Entry object for a particular device
tree. This allows us to read its contents or update it. Add this
information to output_fdt_files and provide a function to read it.

Also rename output_fdt_files since its name is no-longer descriptive.

Signed-off-by: Simon Glass <sjg@chromium.org>

At present these state functions raise an exception if they cannot find
what is requested. But in some cases the information is optional (e.g. an
fdtmap in a coming patch) so it is better to return gracefully.

Update these two functions to return None when the data cannot be found.

Signed-off-by: Simon Glass <sjg@chromium.org>

We can iterate through the output files so don't need this global anymore.
Remove it.

Signed-off-by: Simon Glass <sjg@chromium.org>

At present this excludes the device tree passed in to binman since it
is always returned first by GetAllFdts(). However, this is easy to ensure
by adding a check in that function. Change this dict to includes all
device trees, and rename it to fdt_set.

Signed-off-by: Simon Glass <sjg@chromium.org>

It makes more sense to use entry type as the key for this dictionary,
since the filename can in principle be anything. Make this change and also
rename fdt_files and add a comment to explain it better.

Signed-off-by: Simon Glass <sjg@chromium.org>