[OE-core] [PATCH 1/1] [1.2.1] initrdscripts: Update install.sh to work with mmc devices

[Darren Hart]

Fixes [YOCTO #2385]

The installer only searches for hd[ab] sd[ab]. Some newer BSPs have mmcblk
devices that should be used as the install target. These devices also have a
partition prefix (mmcblk0p1 instead of mmcblk01). As they are detected
asynchronously, it is necessary to add the rootwait kernel parameter to avoid
a race condition trying to mount the root device.

As BSPs like the FRI2 and the sys940x have mmc devices and will have a 1.2
release, we should push this to 1.2.1. The changes are perfectly contained and
easily verified.

Test for an mmcblk device and add the p partition prefix if necessary. Add the
rootwait kernel parameter when an mmcblk device is detected.  Replace the series
of explicit umount commands with a single umount using a wildcard. This will
find all the partitions and will not try to unmount non-existant devices. Avoid
copy and paste errors by replacing /dev/${device}${pX} references with the
previously assigned rootfs, bootfs, and swap variables.

These changes have been tested on the FRI2 Sato image which installed to
/dev/mmcblk0 as well as the N450 Sato image which installed to /dev/sda. Both
were successful.

Please apply to master as well as the 1.2.1 branch.

Signed-off-by: Darren Hart <dvhart at linux.intel.com>
CC: Scott Garman <scott.a.garman at intel.com>
---
 .../initrdscripts/files/init-install.sh            |   45 ++++++++++---------
 .../initrdscripts/initramfs-live-install_1.0.bb    |    2 +-
 2 files changed, 25 insertions(+), 22 deletions(-)

diff --git a/meta/recipes-core/initrdscripts/files/init-install.sh b/meta/recipes-core/initrdscripts/files/init-install.sh
index 90978dd..01ff829 100644
--- a/meta/recipes-core/initrdscripts/files/init-install.sh
+++ b/meta/recipes-core/initrdscripts/files/init-install.sh
@@ -16,7 +16,7 @@ swap_ratio=5
 found="no"
 
 echo "Searching for a hard drive..."
-for device in 'hda' 'hdb' 'sda' 'sdb'
+for device in 'hda' 'hdb' 'sda' 'sdb' 'mmcblk0' 'mmcblk1'
   do
   if [ -e /sys/block/${device}/removable ]; then
       if [ "$(cat /sys/block/${device}/removable)" = "0" ]; then
@@ -62,13 +62,7 @@ rm -f /etc/udev/scripts/mount*
 #
 # Unmount anything the automounter had mounted
 #
-umount /dev/${device} 2> /dev/null || /bin/true
-umount /dev/${device}1 2> /dev/null || /bin/true
-umount /dev/${device}2 2> /dev/null || /bin/true
-umount /dev/${device}3 2> /dev/null || /bin/true
-umount /dev/${device}4 2> /dev/null || /bin/true
-umount /dev/${device}5 2> /dev/null || /bin/true
-umount /dev/${device}6 2> /dev/null || /bin/true
+umount /dev/${device}* 2> /dev/null || /bin/true
 
 if [ ! -b /dev/sda ] ; then
     mknod /dev/sda b 8 0
@@ -94,14 +88,23 @@ rootfs_start=$((boot_size + 1))
 rootfs_end=$((rootfs_start+rootfs_size))
 swap_start=$((rootfs_end+1))
 
-bootfs=/dev/${device}1
-rootfs=/dev/${device}2
-swap=/dev/${device}3
+# MMC devices are special in a couple of ways
+# 1) they use a partition prefix character 'p'
+# 2) they are detected asynchronously (need rootwait)
+rootwait=""
+part_prefix=""
+if [ ! "${device#mmcblk}" = "${device}" ]; then
+	part_prefix="p"
+	rootwait="rootwait"
+fi
+bootfs=/dev/${device}${part_prefix}1
+rootfs=/dev/${device}${part_prefix}2
+swap=/dev/${device}${part_prefix}3
 
 echo "*****************"
-echo "Boot partition size:   $boot_size MB (/dev/${device}1)"
-echo "Rootfs partition size: $rootfs_size MB (/dev/${device}2)"
-echo "Swap partition size:   $swap_size MB (/dev/${device}3)"
+echo "Boot partition size:   $boot_size MB ($bootfs)"
+echo "Rootfs partition size: $rootfs_size MB ($rootfs)"
+echo "Swap partition size:   $swap_size MB ($swap)"
 echo "*****************"
 echo "Deleting partition table on /dev/${device} ..."
 dd if=/dev/zero of=/dev/${device} bs=512 count=2
@@ -109,24 +112,24 @@ dd if=/dev/zero of=/dev/${device} bs=512 count=2
 echo "Creating new partition table on /dev/${device} ..."
 parted /dev/${device} mklabel msdos
 
-echo "Creating boot partition on /dev/${device}1"
+echo "Creating boot partition on $bootfs"
 parted /dev/${device} mkpart primary 1 $boot_size
 
-echo "Creating rootfs partition on /dev/${device}2"
+echo "Creating rootfs partition on $rootfs"
 parted /dev/${device} mkpart primary $rootfs_start $rootfs_end
 
-echo "Creating swap partition on /dev/${device}3"
+echo "Creating swap partition on $swap"
 parted /dev/${device} mkpart primary $swap_start $disk_size
 
 parted /dev/${device} print
 
-echo "Formatting /dev/${device}1 to ext2..."
+echo "Formatting $bootfs to ext2..."
 mkfs.ext3 $bootfs
 
-echo "Formatting /dev/${device}2 to ext3..."
+echo "Formatting $rootfs to ext3..."
 mkfs.ext3 $rootfs
 
-echo "Formatting swap partition...(/dev/${device}3)"
+echo "Formatting swap partition...($swap)"
 mkswap $swap
 
 mkdir /ssd
@@ -150,7 +153,7 @@ fi
 
 if [ -f /ssd/etc/grub.d/40_custom ] ; then
     echo "Preparing custom grub2 menu..."
-    sed -i "s at __ROOTFS__@$rootfs at g" /ssd/etc/grub.d/40_custom
+    sed -i "s at __ROOTFS__@$rootfs $rootwait at g" /ssd/etc/grub.d/40_custom
     sed -i "s/__VIDEO_MODE__/$3/g" /ssd/etc/grub.d/40_custom
     sed -i "s/__VGA_MODE__/$4/g" /ssd/etc/grub.d/40_custom
     mount $bootfs /bootmnt
diff --git a/meta/recipes-core/initrdscripts/initramfs-live-install_1.0.bb b/meta/recipes-core/initrdscripts/initramfs-live-install_1.0.bb
index 793a4b7..ac73ef8 100644
--- a/meta/recipes-core/initrdscripts/initramfs-live-install_1.0.bb
+++ b/meta/recipes-core/initrdscripts/initramfs-live-install_1.0.bb
@@ -3,7 +3,7 @@ LICENSE = "MIT"
 LIC_FILES_CHKSUM = "file://${COREBASE}/meta/COPYING.MIT;md5=3da9cfbcb788c80a0384361b4de20420"
 SRC_URI = "file://init-install.sh"
 
-PR = "r6"
+PR = "r7"
 
 RDEPENDS_${PN} = "grub parted e2fsprogs-mke2fs"
 
-- 
1.7.5.4