From 41f9bb9b7c0d6414b67e935069076b85ad1d5e15 Mon Sep 17 00:00:00 2001
From: Abdoulaye Walsimou Gaye <walsimou@walsimou.com>
Date: Mon, 10 Aug 2009 23:22:11 +0200
Subject: Rootfs: give ability to build cpio archive for initramfs

Signed-off-by: Abdoulaye Walsimou Gaye <walsimou@walsimou.com>
---
 kconfig/fs.kconfig | 20 +++++++++++++++++++-
 mk/fs.mk           | 11 +++++++++++
 mk/rootfs.mk       |  8 +++++++-
 3 files changed, 37 insertions(+), 2 deletions(-)

diff --git a/kconfig/fs.kconfig b/kconfig/fs.kconfig
index 9ce3741..9add022 100644
--- a/kconfig/fs.kconfig
+++ b/kconfig/fs.kconfig
@@ -31,7 +31,6 @@ config EMBTK_ROOTFS_HAVE_JFFS2
 	bool "Build a JFFS2 root filesystem image"
 	help
 	 Build a JFFS2 root filesystem image for your target
-
 config EMBTK_ROOTFS_HAVE_JFFS2_BLOCKSIZE
 	depends on EMBTK_ROOTFS_HAVE_JFFS2
 	help
@@ -39,4 +38,23 @@ config EMBTK_ROOTFS_HAVE_JFFS2_BLOCKSIZE
 	int "Erase block size to use in KB"
 	default 512
 
+#INITRAMFS cpio archive
+config EMBTK_ROOTFS_HAVE_INITRAMFS_CPIO
+	bool "Build cpio archive for initramfs"
+	help
+	 Build a cpio archive, in order to use it later as source file for
+	 initramfs in the linux kernel.
+choice
+	depends on EMBTK_ROOTFS_HAVE_INITRAMFS_CPIO
+	prompt "Compression program to use"
+	config EMBTK_ROOTFS_HAVE_INITRAMFS_CPIO_GZIPED
+		bool "gzip"
+		help
+		 Use gzip compression algorithm.
+	config EMBTK_ROOTFS_HAVE_INITRAMFS_CPIO_BZIPED
+		bool "bzip2"
+		help
+		 Use bzip2 compression algorithm.
+endchoice
+
 endmenu
diff --git a/mk/fs.mk b/mk/fs.mk
index 5181cf4..72ba177 100644
--- a/mk/fs.mk
+++ b/mk/fs.mk
@@ -42,3 +42,14 @@ build_jffs2_rootfs:
 	-o $(EMBTK_ROOT)/rootfs-$(GNU_TARGET)-$(EMBTK_MCU_FLAG).jffs2
 	@rm -rf $(EMBTK_ROOT)/rootfs-$(GNU_TARGET)-$(EMBTK_MCU_FLAG).jffs2.temp
 
+build_initramfs_archive:
+	$(call EMBTK_GENERIC_MESSAGE,"Generating cpio archive for initramfs...")
+ifeq ($(EMBTK_ROOTFS_HAVE_INITRAMFS_CPIO_GZIPED),y)
+	@$(FAKEROOT_BIN) -i $(EMBTK_ROOT)/.fakeroot.001 -- \
+	$(EMBTK_ROOT)/scripts/mkinitramfs $(ROOTFS) gzip \
+	$(EMBTK_ROOT)/initramfs-$(GNU_TARGET)-$(EMBTK_MCU_FLAG)
+else
+	@$(FAKEROOT_BIN) -i $(EMBTK_ROOT)/.fakeroot.001 -- \
+	$(EMBTK_ROOT)/scripts/mkinitramfs $(ROOTFS) bzip2 \
+	$(EMBTK_ROOT)/initramfs-$(GNU_TARGET)-$(EMBTK_MCU_FLAG)
+endif
diff --git a/mk/rootfs.mk b/mk/rootfs.mk
index 6d6d7a2..7429b78 100644
--- a/mk/rootfs.mk
+++ b/mk/rootfs.mk
@@ -32,6 +32,12 @@ include $(EMBTK_ROOT)/mk/fakeroot.mk
 include $(EMBTK_ROOT)/mk/makedevs.mk
 HOSTTOOLS_COMPONENTS += makedevs_install fakeroot_install
 
+#Does CPIO archive for initramfs selected?
+ifeq ($(CONFIG_EMBTK_ROOTFS_HAVE_INITRAMFS_CPIO),y)
+FILESYSTEMS += build_initramfs_archive
+endif
+
+#Does jffs2 filesystem selected?
 ifeq ($(CONFIG_EMBTK_ROOTFS_HAVE_JFFS2),y)
 include $(EMBTK_ROOT)/mk/lzo.mk
 include $(EMBTK_ROOT)/mk/mtd-utils.mk
@@ -66,7 +72,7 @@ else
 endif
 
 rootfs_clean: $(HOSTTOOLS_COMPONENTS_CLEAN) $(ROOTFS_COMPONENTS_CLEAN)
-	@rm -rf rootfs-*
+	@rm -rf rootfs-* initramfs-*
 
 else
 rootfs_build:
-- 
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