From e0e1fb495b585c112496322a488dfa9cfb5f6ba9 Mon Sep 17 00:00:00 2001
From: Andres Salomon <dilinger@debian.org>
Date: Fri, 17 Oct 2008 18:12:09 -0400
Subject: [PATCH] mkjffs2: add (redboot) partition support

We now create a 50MB boot partition, and the rest goes to a root
partition.  This shaves 7s off of bootup, as OFW only has to mount
/boot.  It also provides us the opportunity to use other filesystems
in /, as long as we keep /boot using jffs2.

Signed-off-by: Andres Salomon <dilinger@debian.org>
---
 functions.sh |  4 +--
 mkjffs2.sh   | 71 ++++++++++++++++++++++++++++++++++++++++++++++------
 2 files changed, 66 insertions(+), 9 deletions(-)

diff --git a/functions.sh b/functions.sh
index 29d4ae9..5829dd0 100644
--- a/functions.sh
+++ b/functions.sh
@@ -36,7 +36,7 @@ create_fstab()
 	fstype="$2"
 
 	if [ "${fstype}" = "jffs2" ]; then
-		r=mtd0
+		r=mtd:root
 	else
 		r="LABEL=${IMG_LABEL}"
 	fi
@@ -60,7 +60,7 @@ create_ofwboot()
 	fstype="$2"
 
 	if [ "${fstype}" = "jffs2" ]; then
-		r=mtd0
+		r="mtd:root"
 		rfs="rootfstype=jffs2"
 	else
 		r="LABEL=${IMG_LABEL}"
diff --git a/mkjffs2.sh b/mkjffs2.sh
index f3c521d..da53633 100755
--- a/mkjffs2.sh
+++ b/mkjffs2.sh
@@ -33,10 +33,10 @@ fi
 ROOT_DIR=$1
 IMG_NAME=$2
 
-if [ "${IMG_NAME}" == "${IMG_NAME/.img/.crc}" ]; then
-    CRC_NAME=${IMG_NAME}.crc
+if [ "${IMG_NAME}" == "${IMG_NAME/.img/.dat}" ]; then
+	DAT_NAME=${IMG_NAME}.dat
 else
-    CRC_NAME=${IMG_NAME/.img/.crc}
+	DAT_NAME=${IMG_NAME/.img/.dat}
 fi
 
 if [ ! -d "${ROOT_DIR}" ]; then
@@ -49,7 +49,64 @@ check_for_cmds mkfs.jffs2 sumtool || exit 1
 create_fstab ${ROOT_DIR} jffs2
 create_ofwboot ${ROOT_DIR} jffs2
 
-mkfs.jffs2 -n -e128KiB -r ${ROOT_DIR} -o ${IMG_NAME}.pre
-sumtool -n -p -e 128KiB -i ${IMG_NAME}.pre -o ${IMG_NAME}
-rm -f ${IMG_NAME}.pre
-./crcimg.pl < ${IMG_NAME} > ${CRC_NAME}
+create_jffs2()
+{
+	root_dir="$1"
+	out="$2"
+
+	# XXX:  do we want to switch to lzo?  (mkfs.jffs2 -X lzo)
+	mkfs.jffs2 -n -e128KiB -r ${root_dir} -o ${out}.pre
+	sumtool -n -p -e 128KiB -i ${out}.pre -o ${out}
+	rm -f ${out}.pre
+}
+
+do_sha256()
+{
+	f=$1
+	eblocks=$((`stat --printf "%s\n" $f` / (128*1024)))
+	for b in $(seq 0 $(($eblocks - 1))); do
+		sha=$(dd status=noxfer bs=128KiB skip=$b count=1 if=$f | sha256sum | cut -d- -f1)
+		echo "eblock: `printf '%x' $b` sha256 $sha" >> ${IMG_NAME}
+	done
+}
+
+partition_map()
+{
+	# 0x190 * 128KiB = 50MiB boot, and the rest for root
+	cat >${IMG_NAME}<<EOF
+data:  ${DAT_NAME}
+erase-all
+partitions:  boot 190  root -1
+set-partition: boot 
+mark-pending: 0
+EOF
+	do_sha256 "_boot.img"
+	cat >>${IMG_NAME}<<EOF
+cleanmarkers
+mark-complete: 0
+set-partition: root
+mark-pending: 0
+EOF
+	do_sha256 "_root.img"
+	cat >>${IMG_NAME}<<EOF
+cleanmarkers
+mark-complete: 0
+EOF
+}
+
+# create the boot partition
+ln -s . ${ROOT_DIR}/boot/boot
+create_jffs2 ${ROOT_DIR}/boot _boot.img
+rm -f ${ROOT_DIR}/boot/boot
+
+# create the root partition
+mv ${ROOT_DIR}/boot _boot
+mkdir ${ROOT_DIR}/boot
+create_jffs2 ${ROOT_DIR} _root.img
+rmdir ${ROOT_DIR}/boot
+mv _boot ${ROOT_DIR}/boot
+
+# concat partitions, finish up
+partition_map
+cat _boot.img _root.img > ${DAT_NAME}
+rm -f _boot.img _root.img
-- 
2.39.2