How to inspect OpenEmbedded kickstart wic files
The disk image format used in the Yocto Project is wic. Follow this link to
understand what it is and its history. In addition to the complete manual.
What it is (former .sdcard)
The FSL Community BSP used to provide a *.sdcard image ready to be copied
to the SDCard. Now that the Yocto Project uses the wic format the layer
meta-freescale has also provided some choices to the user, and by default, the
generated image is a *.wic.gz file instead of a *.sdcard.
They are basically the same for the user. The *.gz file must be decompressed
and the next step is exact the same:
$ gunzip core-image-base.wic.gz
$ sudo dd if=core-image-base-wic of=/dev/sdX
How to list all available disk formats
For example, when using FSL Community BSP.
Remember to setup the environment to have access to the wic command.
$ source setup-environment build
$ wic list images
imx-uboot Create SD card image with a boot partition
imx-uboot-spl-bootpart Create SD card image with a boot partition
imx-uboot-spl Create SD card image with a boot partition
imx-uboot-mxs Create SD card image without a boot partition
imx-barebox Create SD card image with a boot partition
imx-uboot-mxs-bootpart Create SD card image with a boot partition
imx-uboot-bootpart Create SD card image with a boot partition
directdisk-gpt Create a 'pcbios' direct disk image
sdimage-bootpart Create SD card image with a boot partition
mkhybridiso Create a hybrid ISO image
directdisk-multi-rootfs Create multi rootfs image using rootfs plugin
mkefidisk Create an EFI disk image
directdisk-bootloader-config Create a 'pcbios' direct disk image with custom bootloader config
systemd-bootdisk Create an EFI disk image with systemd-boot
directdisk Create a 'pcbios' direct disk image
qemux86-directdisk Create a qemu machine 'pcbios' direct disk image
How to list partitions
Two examples on different wic disk images content:
One partition only
$ wic ls ~/pico/core-image-base-imx7d-pico-20180429185116.rootfs.wic
Num Start End Size Fstype
1 4194304 102341631 98147328 ext4
More partitions
$ wic ls tmp/deploy/images/imx7d-pico/core-image-imx7d-pico-20180430173731.rootfs.wic
Num Start End Size Fstype
1 8388608 354686975 346298368 ext4
2 360710144 707008511 346298368 ext4
3 713031680 729808895 16777216 ext4
How to list inside partitions
To list the content of partition number 1 of the following image. Pay attention to the number at the end of command line.
If the partition number does not exist in the disk image, you will face an error. Make sure to list all the existing partitions before list its content.
$ wic ls ~/pico-pi/core-image-base-imx7d-pico-20180429185116.rootfs.wic:1
debugfs 1.42.13 (17-May-2015)
2 40755 (2) 0 0 1024 29-Apr-2018 15:59 .
2 40755 (2) 0 0 1024 29-Apr-2018 15:59 ..
11 40700 (2) 0 0 12288 29-Apr-2018 15:59 lost+found
12 40755 (2) 0 0 1024 29-Apr-2018 15:59 home
14 40755 (2) 0 0 3072 29-Apr-2018 15:53 lib
247 40755 (2) 0 0 1024 29-Apr-2018 15:52 var
290 40755 (2) 0 0 3072 29-Apr-2018 15:59 sbin
359 40755 (2) 0 0 1024 29-Apr-2018 15:40 usr
1851 40755 (2) 0 0 3072 29-Apr-2018 15:59 etc
2154 40755 (2) 0 0 1024 29-Apr-2018 13:00 dev
2155 41777 (2) 0 0 1024 29-Apr-2018 13:00 tmp
2156 40755 (2) 0 0 1024 29-Apr-2018 13:00 sys
2157 40755 (2) 0 0 1024 29-Apr-2018 13:00 media
2158 40755 (2) 0 0 1024 29-Apr-2018 13:00 run
2159 40755 (2) 0 0 1024 29-Apr-2018 15:59 boot
2166 40755 (2) 0 0 1024 29-Apr-2018 15:59 mnt
2168 40755 (2) 0 0 3072 29-Apr-2018 15:59 bin
2239 40755 (2) 0 0 1024 29-Apr-2018 13:00 proc