sdcard_image: align partitions with flash pages

* Align partitions for SD card performance/wear optimization. For more
details, please see:
http://sakoman.com/OMAP/a-script-for-partitioningformatting-a-bootable-sdmicrosd-card.html

# Modifications to align partitioning by Steve Sakoman
# based on work by Arnd Bergmann
# Align partitions for SD card performance/wear optimization
# FAT partition size is 131072 sectors (64MB) less:
#       MBR - 1 sector
#       padding to align to the page size of the underlying flash - 127 sectors
# so we start the first partition at sector 128 and make it 131072 - 128 = 130944 sectors
# second partition starts at 131072 and continues to fill the card

Signed-off-by: Jason Kridner <jdk@ti.com>
Signed-off-by: Denys Dmytriyenko <denys@ti.com>

1 files changed, 3 insertions, 3 deletions

diff --git a/classes/sdcard_image.bbclass b/classes/sdcard_image.bbclass
index 4ebc9986..9e4a959c 100644
--- a/classes/sdcard_image.bbclass
+++ b/classes/sdcard_image.bbclass
@@ -46,9 +46,9 @@ IMAGE_CMD_sdimg () {
         SIZE=$(/sbin/fdisk -l ${LOOPDEV} | grep Disk | grep bytes | awk '{print $5}')
         CYLINDERS=$(echo $SIZE/255/63/512 | bc)
         {
-        echo ,9,0x0C,*
-        echo ,,,-
-        } | /sbin/sfdisk -D -H 255 -S 63 -C ${CYLINDERS} ${LOOPDEV}
+        echo 128,130944,0x0C,*
+        echo 131072,,,-
+        } | /sbin/sfdisk -D -uS -H 255 -S 63 -C ${CYLINDERS} ${LOOPDEV}
 
         # Prepare loop devices for boot and filesystem partitions
         BOOT_OFFSET=32256