sh: romImage support V2

This patch contains support for the romImage build target V2.

The resulting romImage file should be burned to rom
or flash and could be used as small boot loader.

Board code should keep their setup code in the file
romimage.h located in their mach include directory.

Signed-off-by: Magnus Damm <damm@igel.co.jp>
Signed-off-by: Paul Mundt <lethal@linux-sh.org>

6 files changed, 46 insertions, 3 deletions

diff --git a/arch/sh/Makefile b/arch/sh/Makefile
index c46b3d508f22..2a7e73faee89 100644
--- a/arch/sh/Makefile
+++ b/arch/sh/Makefile
@@ -195,7 +195,7 @@ libs-$(CONFIG_SUPERH32)		:= arch/sh/lib/	$(libs-y)
 libs-$(CONFIG_SUPERH64)         := arch/sh/lib64/ $(libs-y)
 
 BOOT_TARGETS = uImage uImage.bz2 uImage.gz uImage.lzma uImage.srec \
-               zImage vmlinux.srec
+               zImage vmlinux.srec romImage
 PHONY += maketools $(BOOT_TARGETS) FORCE
 
 maketools:  include/linux/version.h FORCE
diff --git a/arch/sh/boot/Makefile b/arch/sh/boot/Makefile
index dd2a852041e9..a1316872be6f 100644
--- a/arch/sh/boot/Makefile
+++ b/arch/sh/boot/Makefile
@@ -24,9 +24,9 @@ suffix-$(CONFIG_KERNEL_GZIP)  := gz
 suffix-$(CONFIG_KERNEL_BZIP2) := bz2
 suffix-$(CONFIG_KERNEL_LZMA)  := lzma
 
-targets := zImage vmlinux.srec uImage uImage.srec uImage.gz uImage.bz2 uImage.lzma
+targets := zImage vmlinux.srec romImage uImage uImage.srec uImage.gz uImage.bz2 uImage.lzma
 extra-y += vmlinux.bin vmlinux.bin.gz vmlinux.bin.bz2 vmlinux.bin.lzma
-subdir- := compressed
+subdir- := compressed romimage
 
 $(obj)/zImage: $(obj)/compressed/vmlinux FORCE
         $(call if_changed,objcopy)
@@ -35,6 +35,13 @@ $(obj)/zImage: $(obj)/compressed/vmlinux FORCE
 $(obj)/compressed/vmlinux: FORCE
         $(Q)$(MAKE) $(build)=$(obj)/compressed $@
 
+$(obj)/romImage: $(obj)/romimage/vmlinux FORCE
+        $(call if_changed,objcopy)
+        @echo '  Kernel: $@ is ready'
+
+$(obj)/romimage/vmlinux: $(obj)/zImage FORCE
+        $(Q)$(MAKE) $(build)=$(obj)/romimage $@
+
 KERNEL_MEMORY := 0x00000000
 ifeq ($(CONFIG_PMB_FIXED),y)
 KERNEL_MEMORY := $(shell /bin/bash -c 'printf "0x%08x" \
diff --git a/arch/sh/boot/romimage/Makefile b/arch/sh/boot/romimage/Makefile
new file mode 100644
index 000000000000..5806eee84f6f
--- /dev/null
+++ b/arch/sh/boot/romimage/Makefile
@@ -0,0 +1,19 @@
+#
+# linux/arch/sh/boot/romimage/Makefile
+#
+# create an image suitable for burning to flash from zImage
+#
+
+targets         := vmlinux head.o
+
+OBJECTS = $(obj)/head.o
+LDFLAGS_vmlinux := --oformat $(ld-bfd) -Ttext 0 -e romstart
+
+$(obj)/vmlinux: $(OBJECTS) $(obj)/piggy.o FORCE
+        $(call if_changed,ld)
+        @:
+
+LDFLAGS_piggy.o := -r --format binary --oformat $(ld-bfd) -T
+
+$(obj)/piggy.o: $(obj)/vmlinux.scr arch/sh/boot/zImage FORCE
+        $(call if_changed,ld)
diff --git a/arch/sh/boot/romimage/head.S b/arch/sh/boot/romimage/head.S
new file mode 100644
index 000000000000..97a087bc9c4a
--- /dev/null
+++ b/arch/sh/boot/romimage/head.S
@@ -0,0 +1,10 @@
+/*
+ *  linux/arch/sh/boot/romimage/head.S
+ *
+ * Board specific setup code, executed before zImage loader
+ */
+
+.text
+        .global romstart
+romstart:
+#include <romimage.h>
diff --git a/arch/sh/boot/romimage/vmlinux.scr b/arch/sh/boot/romimage/vmlinux.scr
new file mode 100644
index 000000000000..287c08f8b4bb
--- /dev/null
+++ b/arch/sh/boot/romimage/vmlinux.scr
@@ -0,0 +1,6 @@
+SECTIONS
+{
+  .text : {
+        *(.data)
+        }
+}
diff --git a/arch/sh/include/mach-common/romimage.h b/arch/sh/include/mach-common/romimage.h
new file mode 100644
index 000000000000..267e24112d82
--- /dev/null
+++ b/arch/sh/include/mach-common/romimage.h
@@ -0,0 +1 @@
+/* do nothing here by default */