Re: Improving SD-Card images

[Maciek Borzecki <maciej.borzecki@open-rnd.pl>]

On wto, 2014-07-22 at 07:16 +0200, Jens Rehsack wrote:
> Am 21.07.2014 um 16:50 schrieb Otavio Salvador <otavio@ossystems.com.br>:
>
> > Hello,
> >
> > On Sun, Jul 20, 2014 at 8:13 AM, maciej.borzecki@open-rnd.pl
> > <maciej.borzecki@open-rnd.pl> wrote:
> >>> Dnia 19 lipiec 2014 o 16:50 Jens Rehsack <rehsack@gmail.com> napisał(a):
> >>> the options of meta-fsl-arm/classes/image_types_fsl.bbclass to generate
> >>> sdcards are somehow limited :)
> >>>
> >>> For the final release we'd like to have following partitions:
> >>> 1) boot (ext2, fat?)
> >>> 2) prod-root (squashfs)
> >>> 3) recovery-root (squashfs)
> >>> 4) volatile (ext[34]?)
> >>> 5) changes (unionfs over 2)
> >>>
> >>> Looks as if image_types_fsl.bbclass would need rework to support >2
> >>> partition, but that's just coding.
> >>
> >> Have you considered wic? I've posted a patch that adds building of SD card
> >> image for BBB:
> >> http://article.gmane.org/gmane.linux.embedded.yocto.meta-ti/4171 also
> >> meta-ti have already dumped their
> >> sdimg bbclass in favor of wic. Not saying that meta-fsl should do the same,
> >> just pointing out that there may
> >> be some room for unification.
> > ...
> >
> > This is the long-term goal for sure.
> >
> > I have worked with Tom in extending 'wic' to have the plugin system
> > you used to enable BBB to generate the image. I also want to try to
> > leverage the U-Boot support backend so we can avoid a lot of
> > custom-made recipes and duplication.
> >
> > I wasn't aware of your patch (thanks), I will look at it next week ...
>
> But beside of unifying image creation - which is of course a great step
> for both, anyone who can give me a hint where to look for 2 independent
> filesystems being created in one target (foo-image)?.

This should help:
http://article.gmane.org/gmane.linux.embedded.yocto.meta-ti/4185

You'll also need these patches:
http://article.gmane.org/gmane.comp.handhelds.openembedded.core/53449
http://article.gmane.org/gmane.comp.handhelds.openembedded.core/53422

Then, the kickstart file is as follows:
# vfat boot partition
part --source beaglebonebootimg --ondisk mmcblk0p --fstype=vfat --label boot --active --align 1024 --size 10
# root filesystem
part / --source rootfs --ondisk mmcblk0p --fstype=ext3 --label root --align 1024
# data partition
part /media/data --ondisk mmcblk0p --fstype=vfat --label data --align 1024 --size 100 --fsoptions sync

3 partitions are defined in the file:
- vfat, built by beaglebonebootimg source plugin (see first patch for
  reference on what the plugin does)
- 2nd partition (ext3), built by rootfs plugin (contents of
  IMAGE_ROOTFS)
- 3rd partition (vfat, 100MB, mounted with sync), empty partition,
  automatically added to fstab

Hope this clears things up a bit.

--
Maciej Borzęcki
Senior Software Developer at Open-RnD Sp. z o.o., Poland
www.open-rnd.pl
mobile: +48 889 117 365, fax: +48 42 657 9079

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