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sdcard_image: align partitions with flash pages

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* 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>
This commit is contained in:
Jason Kridner
2011-10-26 21:36:01 -04:00
committed by Denys Dmytriyenko
parent 076a1bd114
commit ed09701ebe
1 changed files with 3 additions and 3 deletions
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classes/sdcard_image.bbclass
+3 -3
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@@ -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