dm3730 build image partition size

Hi,
You can change the partition size when you format the SD card.
Do you want to change the size after format (formatted SD card) ?
I think, you can use "resize2fs" command to do that but better to re-format the SD card with required size.

thanks for replying,

after checking, i need to set the partitions sizes before flashing the image.
this cannot be done after the image is already on the sd.

i tried using "resize2fs" but nothing changed.

i guess its somewhere in the build process..?

Hi,
Are you using any script to create partitions ?
You might have use "fdisk" command to create partitions so, you can check the location of that script with "grep" command.

this is the function that creates the partitions in the build:


create_image_drive()
{
if [ "$Sflag" == "1" ]
then
SDCARDNAME=$1
DSK="/dev/loop0"
DSKPART="/dev/mapper/loop0p"


close_image_drive
echo "Creating disk on $DSK, file $SDCARDNAME"
#for faster generation we use 8k buf instead of 512
#dd if=/dev/zero of=$SDCARDNAME bs=512 count=991664
dd if=/dev/zero of=$SDCARDNAME bs=8192 count=61979
sudo losetup $DSK $SDCARDNAME
sudo sfdisk --force -D -H 255 -S 63 -uS $DSK << EOF >/dev/null 2>&1
63 70000 0c *
70063 307200 83
377263 614400,83
991663 1 83;
EOF
sleep 3;
sudo losetup -d $DSK
sudo kpartx -l $SDCARDNAME
sudo kpartx -a $DSK $SDCARDNAME
sudo mkfs.vfat -F 32 "${DSKPART}1" -v -n boot >/dev/null 2>&1
sudo mkfs.ext3 -L rootfs "${DSKPART}2" >/dev/null 2>&1
sudo mkfs.ext3 -L data "${DSKPART}3" >/dev/null 2>&1
sleep 1;
sync
#SRCDIR=$PWD/image
fi
BTDIR=$INSTALLDIR/boot
RFSDIR=$INSTALLDIR/rootfs


mkdir $BTDIR 2> /dev/null
mkdir $RFSDIR 2> /dev/null
if [ "$Sflag" == "1" ]
then
sudo mount "${DSKPART}1" $BTDIR
#sudo chmod 777 $BTDIR
sudo mount "${DSKPART}2" $RFSDIR
#sudo chmod 777 $RFSDIR
fi
}


I'm getting:
boot 36MB, rootfs 156MB and data 315MB.

Hi Shlomi,

The clearest way to change the size of SD card partitions is to reformat the SD card but the 'resize2fs' gives you one more ability to change the partitions sizes. An important requirement to resize partition (extend) is enough disk space must be available! You can not extend a partition if there are no free sectors/cylinders at the end of the partition to extend.
Also it is recommended to backup the important data.

BR
Tsvetolin Shulev

I've changed the values accordingly from:

63 70000 0c *
70063 307200 83
377263 614400,83
991663 1 83;

to:

63 70000 0c *
70063 607200 83
677263 614400,83
1291663 1 83;

but now the data partition isn't created, only boot and rootfs :/

Hi,
What is your size of SD card ?
You might have created much size for boot and rootfs and rest of the size is may not sufficient for data partition.

Then, remove "2>&1" this from command to see whats going on.
I would like you to suggest to use "sfdisk" command to format the USB pendrive to learn how this commands works.