dtc: Add Kconfig option to pad device tree blob
This will allow arch(s) that use device tree blobs to pad the end of the
device tree so they can be modified by board files at run time. This will
help prevent errors such as FDT_ERR_NOSPACE from occurring.
Signed-off-by: Eric Schikschneit <eric.schikschneit@novatechautomation.com>
[trini: Change default order so that X86 && EFI_APP works correctly]
diff --git a/doc/board/broadcom/bcm7xxx.rst b/doc/board/broadcom/bcm7xxx.rst
index f1994d9..f559d5c 100644
--- a/doc/board/broadcom/bcm7xxx.rst
+++ b/doc/board/broadcom/bcm7xxx.rst
@@ -149,10 +149,8 @@
* to the Linux source tree as a .dts file.
*
* To support modifications to the device tree
- * in-place in U-Boot, add to Linux's
- * arch/arm/boot/dts/Makefile:
- *
- * DTC_FLAGS ?= -p 4096
+ * in-place in U-Boot, set the config variable
+ * CONFIG_SYS_DTC_PAD_BYTES as needed.
*
* This will leave some padding in the DTB and
* thus reserve room for node additions.
diff --git a/doc/develop/makefiles.rst b/doc/develop/makefiles.rst
index 37a7dea..593556f4 100644
--- a/doc/develop/makefiles.rst
+++ b/doc/develop/makefiles.rst
@@ -1430,10 +1430,13 @@
A central rule exists to create `$(obj)/%.dtb` from `$(src)/%.dts`;
architecture Makefiles do no need to explicitly write out that rule.
+ The device tree can now be padded by the specified number of bytes
+ by setting CONFIG_SYS_DTC_PAD_BYTES instead of explicitly setting
+ DTC_FLAGS with the -p option.
+
Example::
targets += $(dtb-y)
- DTC_FLAGS ?= -p 1024
7.9 Preprocessing linker scripts
--------------------------------