Re: [yocto] Simple solution to create a non-root partition image?

[Quentin Schulz <quentin.schulz@cherry.de>]

Hi Michael,

On 5/4/26 3:08 PM, Michael Opdenacker wrote:
> Hi Quentin,
> 
> Thanks a lot for the tip!
> 
> On 5/4/26 10:47 AM, Quentin Schulz wrote:
>> Do you need to generate an image for that partition or can you simply 
>> have what will be part of that partition be generated along with the 
>> "root partition" image?
>>
>> As far as I remember, wic can split files/directories into a separate 
>> partition from the rootfs, so that would be an option that doesn't 
>> require hacking things around.
> Interesting! Unfortunately, I'm not using Wic but Toradex Easy Installer 
> on this project. Therefore I do need to generate a partition image 
> beforehand.

I am not familiar with Toradex Easy Installer but I'm not sure it's 
relevant here? Isn't that simply a glorified dd/bmaptool/balena-etcher?

wic will generate an ISO file if you will. It'll have a partition table 
and possibly multiple partitions within that ISO file. When you flash a 
.wic file, you'll flash the partition table and everything else. See in 
meta-rockchip, we use this Wic KickStart file 
https://git.yoctoproject.org/meta-rockchip/tree/files/wic/rockchip.wks

You can see we declare *many* different partitions, with different 
context (the example is mostly for flashing specific binaries at 
specific offset).

If wic doesn't already install the filesystem it generates for the 
partition, I'm assuming you could extract it from the final image if 
this is really something you need extracted.

Cheers,
Quentin