Rootfs on emmc issue

Technical Support
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1

Hello,

We have a iMX6 colibri module, with a custom rootfs, and I have a question.
We install the rootfs via a NFS server, by typing : dd if=rootfs.ext3 of=/dev/mmcblk0p2 bs=512 conv=fsync
It works fine, the image is flashed, and it boots.

But when I do

root@colibri-imx6:~# df -h
Filesystem      Size  Used Avail Use% Mounted on
/dev/root       1.2G  1.1G  118M  90% /
devtmpfs        121M     0  121M   0% /dev
tmpfs            40K     0   40K   0% /mnt/.psplash
tmpfs           250M  204K  249M   1% /run
tmpfs           250M  128K  250M   1% /var/volatile
/dev/mmcblk1p1   15G  178M   15G   2% /mnt/sdcard

And this :

root@colibri-imx6:~# fdisk -l

Disk /dev/mmcblk1: 14.9 GiB, 15931539456 bytes, 31116288 sectors
Units: sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disklabel type: dos
Disk identifier: 0x00000000


Device         Boot Start      End  Sectors  Size Id Type
/dev/mmcblk1p1       8192 31116287 31108096 14.9G  c W95 FAT32 (LBA)

Disk /dev/mmcblk0: 3.7 GiB, 3959422976 bytes, 7733248 sectors
Units: sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disklabel type: dos
Disk identifier: 0x000a3671

Device         Boot Start     End Sectors  Size Id Type
/dev/mmcblk0p1       8192   40959   32768   16M  c W95 FAT32 (LBA)
/dev/mmcblk0p2      40960 7127039 7086080  3.4G 83 Linux

Disk /dev/mmcblk0boot1: 2 MiB, 2097152 bytes, 4096 sectors
Units: sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk /dev/mmcblk0boot0: 2 MiB, 2097152 bytes, 4096 sectors
Units: sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes

We can clearly see that we have 3.4G of eMMC, but the rootfs is only 1.2G.
How can we extend this part? Are we doing something wrong?

Regards,

2

Hi

To avoid having to download lots of empty space during flashing our update script calculates a minimal size and generates an ext3 partition accordingly. During first boot, a custom resizing script (/usr/sbin/resizefs.sh) is run which increases the partition size to its full extend.

I guess you don’t have the package from this recipe installed. (Or you don’t use systemd and thus the resizing is not started automatically.

Max

3

We created a custom layer, and forgot this recipe! Thanks!
Pierre-Olivier