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Binman construct images consisting of multiple binary files. These files
sometimes need to know (at run timme) where their peers are located. For
example, SPL may want to know where U-Boot is located in the image, so
that it can jump to U-Boot correctly on boot.
In general the positions where the binaries end up after binman has
finished packing them cannot be known at compile time. One reason for
this is that binman does not know the size of the binaries until
everything is compiled, linked and converted to binaries with objcopy.
To make this work, we add a feature to binman which checks each binary
for symbol names starting with '_binman'. These are then decoded to figure
out which entry and property they refer to. Then binman writes the value
of this symbol into the appropriate binary. With this, the symbol will
have the correct value at run time.
Macros are used to make this easier to use. As an example, this declares
a symbol that will access the 'u-boot-spl' entry to find the 'pos' value
(i.e. the position of SPL in the image):
binman_sym_declare(unsigned long, u_boot_spl, pos);
This converts to a symbol called '_binman_u_boot_spl_prop_pos' in any
binary that includes it. Binman then updates the value in that binary,
ensuring that it can be accessed at runtime with:
ulong u_boot_pos = binman_sym(ulong, u_boot_spl, pos);
This assigns the variable u_boot_pos to the position of SPL in the image.
Signed-off-by: Simon Glass <sjg@chromium.org>
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The elf module can provide some debugging information to assist with
figuring out what is going wrong. This is also useful in tests. Update the
-D option so that it is passed through to tests as well.
Signed-off-by: Simon Glass <sjg@chromium.org>
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This file was used to select between the normal and fallback libfdt
implementations. Now that we only have one, it is not needed.
Drop it and fix up all users.
Signed-off-by: Simon Glass <sjg@chromium.org>
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Since fdt is the name of a module, use a different name for variables to
avoid a conflict.
Signed-off-by: Simon Glass <sjg@chromium.org>
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This adds the basic code for binman, including command parsing, processing
of entries and generation of images.
So far no entry types are supported. These will be added in future commits
as examples of how to add new types.
See the README for documentation.
Signed-off-by: Simon Glass <sjg@chromium.org>
Tested-by: Bin Meng <bmeng.cn@gmail.com>
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