Custom kernel drivers

[Manik Taneja]

Ogra,

Can you please advice on the best kernel repo to use for building custom
kernels? also, any suggestions on the errors shown below?

Thanks,
Manik

On Fri, Nov 18, 2016 at 1:07 PM, Peng Liu <pengliu.mail at gmail.com> wrote:

> Hi Manik,
>
> Thanks for your information.
> I have followed the steps from the link you shared with us. And I have
> successfully built the image and boot the hardware. But I have a few
> questions about the process to build customized Linux kernel snap and
> include it in the image.
>
> Let me explain what I have done first.
> 1. Use pc-kernel to build the kernel snap.
> In assertion, include below field:
>  "kernel": "pc-kernel"
>
> Result: The image works fine on hardware.
>
> 2. Build the kernel snap by myself. The source code is from
> https://git.launchpad.net/~ubuntu-kernel/ubuntu/+source/
> linux-snap/+git/xenial
> Then I could build the image with the kernel snap built by myself (by
> modifying "kernel" field in assertion and also change the command line
> parameter)
> #/snap/bin/ubuntu-image -c beta -o snap_test.img test.model --extra-snaps
> pc-kernel_4.4.0-45-4_amd64.snap
>
> Result: The image works fine.
>
> 3. Build the kernel snap from source code. http://kernel.ubuntu.com/git/
> ubuntu/ubuntu-xenial.git/, tag Ubuntu-4.4.0-49.70.
> Then I could build the image with the kernel snap built by myself.
>
> Result: The image does not work. The kernel boot hangs at
> ============================================================
> ====================
> [   23.415517] random: udevadm: uninitialized urandom read (16 bytes read,
> 5 bits of entropy available)
> [   23.415735] random: udevadm: uninitialized urandom read (16 bytes read,
> 5 bits of entropy available)
> [   23.415982] random: udevadm: uninitialized urandom read (16 bytes read,
> 5 bits of entropy available)
> ============================================================
> ====================
>
> I am confused about two repos for the kernel (2 and 3). Looks like the
> kernel repo in method 2 does not build everything from source code, but the
> repo in method 3 does.
> Which repo should I use as the base to customize the kernel and add
> additional drivers?
>
> Thanks!
>
> Peng
>
> On Tue, Nov 15, 2016 at 11:07 PM, Manik Taneja <manik at canonical.com>
> wrote:
>
>>
>>
>> On Tue, Nov 15, 2016 at 8:17 PM, Peng Liu <pengliu.mail at gmail.com> wrote:
>>
>>> Hi Folks,
>>>
>>> I have a related question.
>>> After we build the kernel snap, how can we replace the default kernel
>>> snap if we use the image from ubuntu?
>>> http://releases.ubuntu.com/ubuntu-core/16/
>>>
>>> I tried that but snap command reported an error like "cannot replace
>>> signed ** snap with an unasserted one".
>>> Thanks.
>>>
>> Please follow the process to create your own custom Ubuntu Core image
>> here-
>>
>> http://docs.ubuntu.com/core/en/guides/build-device/image-building
>>
>> and let us know how that goes.
>>
>> Cheers,
>> Manik
>>
>
>
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