Documentation: Allow passing arguments into make livesphinx

It's what the docker container is running and when
using its livehtml feature, it listens at localhost, which isn't always

With `docker run -e SPHINXOPTS="-H $localip" ...` it now listens at
localip, which is more flexible.

Change-Id: Ia0614e57458c32169f6d614783366025e9c814b3
Signed-off-by: Patrick Georgi <>
Reviewed-by: Arthur Heymans <>
Reviewed-by: Paul Menzel <>
Tested-by: build bot (Jenkins) <>
diff --git a/Documentation/Makefile b/Documentation/Makefile
index ed08936b..b4fe8df 100644
--- a/Documentation/Makefile
+++ b/Documentation/Makefile
@@ -52,4 +52,4 @@
 	rm -f corebootPortingGuide.pdf
-	$(MAKE) -f Makefile.sphinx livehtml
+	$(MAKE) -f Makefile.sphinx livehtml SPHINXOPTS="$(SPHINXOPTS)"