Fix an 'EFL' typo. It should be 'ELF'.

Signed-off-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Neha Malcom Francis <n-francis@ti.com>

The base address of the ELF containing symbols is normally added to
any symbols written, so that the value points to the correct address in
memory when everything is loaded. When the binary resides on disk, a
different offset may be needed, typically 0. Provide a way to specify
this.

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

Add a clarification to the documentation and add a missing comment. Also
update the test so that when it fails it is easier to see what is going
on, rather than having to decode hex strings.

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

These functions get the value of a symbol. The reference to ELF files
is confusing since they are reading the position/size of entries, not
ELF symbols. Rename the functions and adjust the comments also.

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

When symbol-writing does not appear to work, it can sometimes be hard to
figure out what is going on. Add some more debugging to help.

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

Check if elf tools are available when running DecodeElf(). Also
remove superfuous semicolon at line ending.

Signed-off-by: Lukas Funke <lukas.funke@weidmueller.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
Revert part of patch to make binman test pass
Signed-off-by: Simon Glass <sjg@chromium.org>

Update the LookupAndWriteSymbols() function to return the number of
symbols written. Also add some logging for when debugging is not
enabled.

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

The patman directory has a number of modules which are used by other tools
in U-Boot. This makes it hard to package the tools using pypi since the
common files must be copied along with the tool that uses them.

To address this, move these files into a new u_boot_pylib library. This
can be packaged separately and listed as a dependency of each tool.

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

In some cases it is useful to position an entry over the top of a symbol
in an ELF file. For example, if the symbol holds a version string then it
allows the string to be accessed from the fdtmap.

Add support for this.

Suggested-by: Pali Rohár <pali@kernel.org>
Suggested-by: Keith Short <keithshort@chromium.org>
Signed-off-by: Simon Glass <sjg@chromium.org>

The current support for updating variables in a binary is hard-coded to
work with U-Boot:

- It assumes the image starts at __image_copy_start
- It uses the existing U-Boot-specific entry types

It is useful for other projects to use these feature.

Add properties to enable writing symbols for any blob, a way of specifying
the base symbol and a way of providing the ELF filename to allow symbol
lookup to take place.

With this it is possible to update a Zephyr image, such as zephyr.bin
after it has been built.

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