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>
diff --git a/tools/binman/README.entries b/tools/binman/README.entries
index 8651ba0..368c976 100644
--- a/tools/binman/README.entries
+++ b/tools/binman/README.entries
@@ -1056,6 +1056,28 @@
+Entry: u-boot-tpl-bss-pad: U-Boot TPL binary padded with a BSS region
+---------------------------------------------------------------------
+
+Properties / Entry arguments:
+ None
+
+This holds the padding added after the TPL binary to cover the BSS (Block
+Started by Symbol) region. This region holds the various variables used by
+TPL. It is set to 0 by TPL when it starts up. If you want to append data to
+the TPL image (such as a device tree file), you must pad out the BSS region
+to avoid the data overlapping with U-Boot variables. This entry is useful in
+that case. It automatically pads out the entry size to cover both the code,
+data and BSS.
+
+The contents of this entry will a certain number of zero bytes, determined
+by __bss_size
+
+The ELF file 'tpl/u-boot-tpl' must also be available for this to work, since
+binman uses that to look up the BSS address.
+
+
+
Entry: u-boot-tpl-dtb: U-Boot TPL device tree
---------------------------------------------