[yocto] Yocto on X86 Question

[Maxim Radugin]

Hello Albert,

You can use initramfs to accomplish all of your tasks.
1) Take a look at meta/recipes-core/initrdscripts/initramfs-live-boot_1.0.bb
as a starting point, it provides ability to mount rootfs with overlay fs in
ram (but all the modifications to rootfs are lost after reboot); You'll
have to write your own implementation where other partition or file is used
as an overlay;
2) You will have to create web interface yourself; Typically you have to
upload update files using web ui to some location which is accessible from
initramfs; then from the initramfs script check if there are update files
available, validate them, and replace existing initrd, vmlinuz rootfs.img,
remove update files and reboot;
3) I don't think that there is such functionality out of the box, because
it is very application-specific, but you can write your own implementation;
Again, this can be done from the initramfs script, just recreate partition
or file with overlay, this will return rootfs to its initial state;

Probably you will have to re-partition your CF card for your specific
needs, take a look at meta-raspberrypi/classes/sdcard_image-rpi.bbclass.

BR,
Maxim.


On Thu, Jun 26, 2014 at 6:22 AM, Albert K <alberk at gmail.com> wrote:

> Hi,
>
> I am a newbie and would like help to point me the right direction with
> regards to yocto project on X86 system with CF card as boot disk with AMI
> or Phoenix Bios.   I have a few questions listed below
>
> 1) How do i build a project with read-only filesystem with an overylay
> filesystem ?
>    something similar to squashfs and jffs2 or something else.
> 2) How to i update the firmware after the initial burn to CF?  A web
> interface update would be appreciated.
> 3) Is there a recipe or build-in function to reset the firmware to factory
> setting via serial console or SSH, etc?
>
> Thank you for helping.
>
> Regards.
>
>
>
> --
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> yocto at yoctoproject.org
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>
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