How to build a ramdisk (rootfs.ext2.gz.uboot) in yocto

[manjunathjoshi]

Hello All,

I know the procedure to build ramdisk in ltib set up but wanted to try similar thing in yocto. Does anybody know how to build ramdisk?

Regards,

Manju

[jeremythien]

This may be a bit late to be helpful, but I found I can accomplish this by adding these two lines to my image configuration:

inherit image_types_uboot

IMAGE_FSTYPES = "ext3.gz.u-boot"

P.S. I am using "morty".

[manjunathjoshi]

Hello Jeremy,

Thanks for the reply. But where exactly should i add this?

If i try to add it to core-image-minimal.bb file i get error like below,

ERROR: Unbuildable tasks were found.
These are usually caused by circular dependencies and any circular dependency chains found will be printed below. Increase the debug level to see a list of unbuildable tasks.

Please attach the .bb file

Regards,

Manju

[manjunathjoshi · Accepted solution]

Hello All,

I guess i have found out a way. Now yocto is not supporting .u-boot format for filesystem compilation.

The yocto now is supporting following image fstypes by default.

jffs2

  jffs2.sum

  cramfs

  ext2

  ext2.gz

  ext2.bz2

  ext3

  ext3.gz

  ext2.lzma

  btrfs

  live

  squashfs

  squashfs-xz

  ubi

  ubifs

  tar

  tar.gz

  tar.bz2

  tar.xz

  cpio

  cpio.gz

  cpio.xz

  cpio.lzma

  vmdk

  elf

So what i did was,

1. First i compiled with option ext3 and ext3.gz in local.conf.

IMAGE_FSTYPES += "ext3 ext3.gz "

Then, i used below command to get what i wanted.

2. Do bitbake again.

   bitbake core-image-minimal   // Now the image is of ext3.gz format

3. Now

   cd tmp/deploy/images/imx6qsabresd/

4. Run the below command to generate ramdisk image.

   mkimage -A arm -O linux -T ramdisk -C gzip -n core-image-minimal -d core-image-minimal-imx6qsabresd-XXXX.rootfs.ext3.gz core-image-minimal-imx6qsabresd-XXXXX.rootfs.ext3.gz.u-boot

Here core-image-minimal is the name of the RAMDISK image.

NOTE: MAKE SURE "mkimage" is there on UBUNTU else run

  sudo apt-get install u-boot-tools

To burn ramdisk

dd if=ramdiskimageXXX.uboot of=/dev/mmcblk0 bs=10M seek=1

Bootargs to boot from RAMDISK

U-Boot > setenv bootargs 'root=/dev/ram rw ramdisk_size=13239 console=ttymxc0,115200'

U-Boot > setenv bootcmd 'mmc dev 1;fatload mmc 1 0x12000000 uImage;fatload mmc 1 0x18000000 imx6q-magik2.dtb; mmc read 0x20000000 0x5000 0x2200;bootm 0x12000000 0x20000000 0x18000000'

U-Boot > boot

Thanks all,

[igorpadykov]

Hi Manjunath

for building manufacturing tool image one can look

at attached Yocto Guide sect.6.2 Manufacturing Tool, MFGTool

Best regards

igor

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[manjunathjoshi]

Hello Igor,

Thanks for the immediate reply but i need a RAMDISK filesystem for a normal image like fsl-image-fb, or fsl-image-multimedia or even core-image-minimal is fine.

Regards,

Manju

[manjunathjoshi]

Hello All,

I don't know why this thread is assumed answered. The fact of the matter is, It is still not answered. Is there any way to build rootfs.ext3.gz and rootfs.ext3.gz.u-boot .

Do i need to build with specific options in conf/local.conf or the .bb file or the ./poky/meta/classes/image_types.bbclass.

If there is a way please anybody let me know.

Or give me a link where i can get this info.

Regards,

Manju