Rootfs file type


I want to know the rootfs file
Basically, I want to “untar” the above file, add some of my own stuff,
and “tar” it again as the rootfs file image. I tried various methods, e.g.,
mounting as a loop device or kpartx, all of them do not work.

fdisk -l shows the following:

plumgrid@yhs-plumgrid:~/hikey$ fdisk -l hikey-jessie_developer_20150208-104.emmc.img

Disk hikey-jessie_developer_20150208-104.emmc.img: 978 MB, 978442240 bytes
255 heads, 63 sectors/track, 118 cylinders, total 1911020 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 identifier: 0x00000000

Disk hikey-jessie_developer_20150208-104.emmc.img doesn’t contain a valid partition table

anybody knows the procedure of how to mount this image properly?


Hi yhs,

The image is in sparse format. You must “unsparse it” before to use it.

You can find some instructions to unpack / pack the images in sparse format.

Best regards.