binman: Provide a way to set the symbol base address

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>

1 files changed, 7 insertions, 1 deletions

diff --git a/tools/binman/entry.py b/tools/binman/entry.py
index 7d4d4692776..8ad9fe89e0c 100644
--- a/tools/binman/entry.py
+++ b/tools/binman/entry.py
@@ -108,6 +108,9 @@ class Entry(object):
             not need to be done again. This is only used with 'binman replace',
             to stop sections from being rebuilt if their entries have not been
             replaced
+        symbols_base (int): Use this value as the assumed load address of the
+            target entry, when calculating the symbol value. If None, this is
+            0 for blobs and the image-start address for ELF files
     """
     fake_dir = None
 
@@ -159,6 +162,7 @@ class Entry(object):
         self.preserve = False
         self.build_done = False
         self.no_write_symbols = False
+        self.symbols_base = None
 
     @staticmethod
     def FindEntryClass(etype, expanded):
@@ -324,6 +328,7 @@ class Entry(object):
 
         self.preserve = fdt_util.GetBool(self._node, 'preserve')
         self.no_write_symbols = fdt_util.GetBool(self._node, 'no-write-symbols')
+        self.symbols_base = fdt_util.GetInt(self._node, 'symbols-base')
 
     def GetDefaultFilename(self):
         return None
@@ -713,7 +718,8 @@ 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, self.elf_base_sym)
+                                      is_elf, self.elf_base_sym,
+                                      self.symbols_base)
 
     def CheckEntries(self):
         """Check that the entry offsets are correct