[yocto] Multiple partitions in drive image

[Gary Thomas]

On 2012-10-15 13:19, Mark Hatle wrote:
> On 10/15/12 1:59 AM, Joshua Immanuel wrote:
>> Hello Jonathan,
>>
>> On Fri, 2012-10-12 at 21:42 +0000, Jonathan Haws wrote:
>>> What I am trying to do is have Poky build me an image that I can just
>>> 'dd' to a SSD and hook up to the system to boot.  Since that image
>>> will also only be only ~250MB or so, I would like to have Poky
>>> generate an image containing multiple partitions - a small one
>>> containing the boot files, then the rest of the image dedicated to
>>> storage.  Is that possible?
>>
>> Yes. It is possible. I have done the following in order to generate
>> image with multiple partitions.
>>
>>       1. I wrote a custom image_types.bbclass in order to generate
>>          multiple partition images (say /, /var etc)
>>       2. Wrote a bbappend for base-files recipe to generate custom fstab
>>          file with required partition's mount options
>>       3. Extended grub-native recipe to generate core.img and boot.img
>>          using grub-mkimage for target platform
>>       4. Wrote a python task to join all these generated images (boot,
>>          core and filesystem images) and embedded the partition table
>>          structure into it.
>>       5. Added this task to my image recipe after the 'do_rootfs' task
>>
>> This way we can generate a custom image with the required partitions.
>>
>
> Recently a we've been talking about how we could do this.  Specifically how to construct a disk image that can just be DD'ed including bootloader, partitioning and multiple
> partitions.
>
> Is the code you used for the dynamic fstab, partition map, and bootloader setup and image creation available anywhere?
>
> I expect it isn't too difficult to create, but if there is something to start with it would be useful.

There are a lot of examples for this - try looking at meta-fsl-arm
it supports a 'sdcard' image type which is what you are looking for.

git:://github.com/Freescale/meta-fsl-arm.git

-- 
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Gary Thomas                 |  Consulting for the
MLB Associates              |    Embedded world
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