From 5ea509fd126b7e51fb32ac46c880b86817c8d7a1 Mon Sep 17 00:00:00 2001
From: Nikunj A Dadhania <nikunj@linux.vnet.ibm.com>
Date: Fri, 14 Feb 2014 11:32:38 +0530
Subject: Introduce dummy console device

Qemu can create console-less machine, aka no output device. And there
are dependencies in the guest which expects a valid output device. Add
this dummy device that gobbles up all the output send, and keeps the
guest happy.

Signed-off-by: Nikunj A Dadhania <nikunj@linux.vnet.ibm.com>
---
 board-qemu/slof/Makefile    |  1 +
 board-qemu/slof/OF.fs       |  8 +++++++-
 board-qemu/slof/dev-null.fs | 35 +++++++++++++++++++++++++++++++++++
 3 files changed, 43 insertions(+), 1 deletion(-)
 create mode 100644 board-qemu/slof/dev-null.fs

diff --git a/board-qemu/slof/Makefile b/board-qemu/slof/Makefile
index 43db4aa..6a9fa17 100644
--- a/board-qemu/slof/Makefile
+++ b/board-qemu/slof/Makefile
@@ -76,6 +76,7 @@ VIO_FFS_FILES = \
 	$(SLOFBRDDIR)/virtio-net.fs \
 	$(SLOFBRDDIR)/virtio-block.fs \
 	$(SLOFBRDDIR)/virtio-fs.fs \
+	$(SLOFBRDDIR)/dev-null.fs \
 	$(SLOFBRDDIR)/virtio-scsi.fs
 
 # Files that should go into the ROM fs (and so have to be listed in OF.ffs):
diff --git a/board-qemu/slof/OF.fs b/board-qemu/slof/OF.fs
index 061df66..66af237 100644
--- a/board-qemu/slof/OF.fs
+++ b/board-qemu/slof/OF.fs
@@ -226,7 +226,13 @@ romfs-base 400000 0 ' claim CATCH IF ." claim failed!" cr 2drop THEN drop
 	    ." using hvterm" cr
             " hvterm" io
 	  ELSE
-	    ." and no default found" cr
+	    " /openprom" find-node ?dup IF
+		set-node
+		." and no default found, creating dev-null" cr
+		" dev-null.fs" included
+		" devnull-console" io
+		0 set-node
+	    THEN
 	  THEN
         THEN
     THEN
diff --git a/board-qemu/slof/dev-null.fs b/board-qemu/slof/dev-null.fs
new file mode 100644
index 0000000..d0ffad6
--- /dev/null
+++ b/board-qemu/slof/dev-null.fs
@@ -0,0 +1,35 @@
+\ Introduce a dummy console that will eat away all chars and make all
+\ the components dependent on stdout happy.
+
+new-device
+" devnull-console" device-name
+
+: open true ;
+: close ;
+
+: write ( adr len -- actual )
+  nip
+;
+
+: read  ( adr len -- actual )
+  nip
+;
+
+: setup-alias
+    " devnull-console" find-alias 0= IF
+        " devnull-console" get-node node>path set-alias
+    ELSE
+        drop
+    THEN
+;
+
+: dummy-term-emit drop ;
+: dummy-term-key  0 ;
+: dummy-term-key? FALSE ;
+
+' dummy-term-emit to emit
+' dummy-term-key  to key
+' dummy-term-key? to key?
+
+setup-alias
+finish-device
-- 
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