[ptxdist] [PATCH 1/3] blspec-entry: add linux-appendroot support

[Marco Felsch <m.felsch@pengutronix.de>]

Add a Kconfig switch to set the linxu-appendroot option to true. This
can be very useful for the Barebox bootloader.

Signed-off-by: Marco Felsch <m.felsch@pengutronix.de>
---
 platforms/blspec-entry.in               | 10 ++++++++++
 projectroot/loader/entries/default.conf |  1 +
 rules/blspec-entry.make                 | 10 +++++++++-
 3 files changed, 20 insertions(+), 1 deletion(-)

diff --git a/platforms/blspec-entry.in b/platforms/blspec-entry.in
index aed65d40a..1a4ecb26c 100644
--- a/platforms/blspec-entry.in
+++ b/platforms/blspec-entry.in
@@ -16,4 +16,14 @@ config BLSPEC_ENTRY_CMDLINE
 	string
 	prompt "kernel command-line"
 
+config BLSPEC_ENTRY_APPENDROOT
+	bool
+	prompt "Set linux-appendroot to true"
+	help
+	  If enabled this options adds 'linux-appendroot true' to the blspec
+	  entry else 'linux-appendroot false' is added. This is a useful
+	  Barebox specific option. Barebox will set the the 'root=' kernel
+	  command line parameter to the source from which Barebox loaded the
+	  kernel image if specified.
+
 endif
diff --git a/projectroot/loader/entries/default.conf b/projectroot/loader/entries/default.conf
index 5650907ab..d28156975 100644
--- a/projectroot/loader/entries/default.conf
+++ b/projectroot/loader/entries/default.conf
@@ -3,3 +3,4 @@ version		@VERSION@
 options		@CMDLINE@
 linux		@KERNEL@
 @DEVICETREE@
+@LINUXAPPENDROOT@
diff --git a/rules/blspec-entry.make b/rules/blspec-entry.make
index f393b1bda..c0d2416cf 100644
--- a/rules/blspec-entry.make
+++ b/rules/blspec-entry.make
@@ -35,6 +35,12 @@ else
 BLSPEC_KERNEL_IMAGE	= $(KERNEL_IMAGE)
 endif
 
+ifdef PTXCONF_BLSPEC_ENTRY_APPENDROOT
+BLSPEC_APPENDROOT	= linux-appendroot\ttrue
+else
+BLSPEC_APPENDROOT	= linux-appendroot\tfalse
+endif
+
 $(STATEDIR)/blspec-entry.targetinstall:
 	@$(call targetinfo)
 
@@ -56,7 +62,9 @@ $(STATEDIR)/blspec-entry.targetinstall:
 		$(call install_replace, blspec-entry, /loader/entries/$(name).conf, \
 			@KERNEL@,'/boot/$(BLSPEC_KERNEL_IMAGE)')$(ptx/nl) \
 		$(call install_replace, blspec-entry, /loader/entries/$(name).conf, \
-			@DEVICETREE@,'$(call blspec/devicetree,$(name))')$(ptx/nl))
+			@DEVICETREE@,'$(call blspec/devicetree,$(name))')$(ptx/nl) \
+		$(call install_replace, blspec-entry, /loader/entries/$(name).conf, \
+			@LINUXAPPENDROOT@,'$(BLSPEC_APPENDROOT)')$(ptx/nl))
 
 	@$(call install_finish,blspec-entry)
 
-- 
2.30.2