binman: Provide general support for updating ELF symbols

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>

1 files changed, 2 insertions, 1 deletions

diff --git a/tools/binman/entry.py b/tools/binman/entry.py
index 0c94665f7a8..aca08e62d3a 100644
--- a/tools/binman/entry.py
+++ b/tools/binman/entry.py
@@ -144,6 +144,7 @@ class Entry(object):
         self.absent = False
         self.optional = False
         self.overlap = False
+        self.elf_base_sym = None
 
     @staticmethod
     def FindEntryClass(etype, expanded):
@@ -676,7 +677,7 @@ class Entry(object):
             # Check if we are writing symbols into an ELF file
             is_elf = self.GetDefaultFilename() == self.elf_fname
             elf.LookupAndWriteSymbols(self.elf_fname, self, section.GetImage(),
-                                      is_elf)
+                                      is_elf, self.elf_base_sym)
 
     def CheckEntries(self):
         """Check that the entry offsets are correct