[PATCH,v3][sim,moxie] Fix DTB generation mechanism and build failure

[Luis Machado]

I ran into a build failure with --enable-targets=all due to the fact that
the moxie sim expects to be able to use the dtc tool.  If it isn't available,
the builds fails.

The following patch adds a prebuilt dtb file to the tree. That file is the one
that is used for installations.

The patch also enables (re-)generation of the dtb file through maintainer
mode, if it needs to be updated due to a change in the dts file.

Tested on aarch64-linux/x86_64-linux.

sim/moxie/ChangeLog:

YYYY-MM-DD  Luis Machado  <luis.machado@linaro.org>

	* Makefile.in (moxie-gdb.dtb): Add maintainer mode dependency.
	(install-dtb): Install prebuilt dtb file.
	* moxie-gdb.dtb: New prebuilt file.
---
 sim/moxie/Makefile.in   |  16 +++++++++++++---
 sim/moxie/moxie-gdb.dtb | Bin 0 -> 519 bytes
 2 files changed, 13 insertions(+), 3 deletions(-)
 create mode 100644 sim/moxie/moxie-gdb.dtb

diff --git a/sim/moxie/Makefile.in b/sim/moxie/Makefile.in
index ee513867290..bd58074491f 100644
--- a/sim/moxie/Makefile.in
+++ b/sim/moxie/Makefile.in
@@ -17,6 +17,8 @@
 
 ## COMMON_PRE_CONFIG_FRAG
 
+DTC = @DTC@
+
 dtbdir = @datadir@/gdb/dtb
 
 SIM_OBJS = \
@@ -32,9 +34,17 @@ SIM_EXTRA_CFLAGS = -DDTB="\"$(dtbdir)/moxie-gdb.dtb\""
 
 all: moxie-gdb.dtb
 
-moxie-gdb.dtb: moxie-gdb.dts
-	dtc -O dtb -o moxie-gdb.dtb ${srcdir}/moxie-gdb.dts
+moxie-gdb.dtb: @MAINTAINER_MODE_TRUE@ moxie-gdb.dts
+	@echo Regenerating moxie-gdb.dtb
+	if test "x$(DTC)" != x; then \
+	  $(DTC) -O dtb -o moxie-gdb.dtb ${srcdir}/moxie-gdb.dts || exit 1; \
+	  $(SHELL) $(srcroot)/move-if-change moxie-gdb.dtb ${srcdir}/moxie-gdb.dtb || exit 1; \
+	else \
+	  echo "Could not update the moxie-gdb.dtb file because the device "; \
+	  echo "tree compiler tool (dtc) is missing.  Install the tool to "; \
+	  echo "update the device tree blob."; \
+	fi
 
 install-dtb: moxie-gdb.dtb
 	$(SHELL) $(srcdir)/../../mkinstalldirs $(DESTDIR)$(dtbdir)
-	$(INSTALL_DATA) moxie-gdb.dtb $(DESTDIR)$(dtbdir)/moxie-gdb.dtb
+	$(INSTALL_DATA) $(srcdir)/moxie-gdb.dtb $(DESTDIR)$(dtbdir)/moxie-gdb.dtb
diff --git a/sim/moxie/moxie-gdb.dtb b/sim/moxie/moxie-gdb.dtb
new file mode 100644
index 0000000000000000000000000000000000000000..4c7e4570438a62b81df2021bb4c955d9888d2a8b
GIT binary patch
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-- 
2.25.1