binman: Add support for u-boot-tpl-bss-bad

This entry holds the padding between the end of of TPL binary and the
end of BSS. This region must be left empty so that the devicetree can be
appended correctly and remain accessible without interfering with BSS.

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

tools/binman/ftest.py

@@ -4262,6 +4262,22 @@ class TestFunctional(unittest.TestCase):
         self.assertEqual(U_BOOT_TPL_NODTB_DATA,
                          data[:len(U_BOOT_TPL_NODTB_DATA)])
 
+    def testTplBssPad(self):
+        """Test that we can pad TPL's BSS with zeros"""
+        # ELF file with a '__bss_size' symbol
+        self._SetupTplElf()
+        data = self._DoReadFile('193_tpl_bss_pad.dts')
+        self.assertEqual(U_BOOT_TPL_DATA + tools.GetBytes(0, 10) + U_BOOT_DATA,
+                         data)
+
+    def testTplBssPadMissing(self):
+        """Test that a missing symbol is detected"""
+        self._SetupTplElf('u_boot_ucode_ptr')
+        with self.assertRaises(ValueError) as e:
+            self._DoReadFile('193_tpl_bss_pad.dts')
+        self.assertIn('Expected __bss_size symbol in tpl/u-boot-tpl',
+                      str(e.exception))
+
 
 if __name__ == "__main__":
     unittest.main()