[Dragonboard410c] Ubuntu OS Build Issues, and Support

[Sunny Bhayani]

Hi Paolo / Oliver,


Thank you for your email.


> On Wed, Feb 22, 2017 at 10:19:25AM +0100, Oliver Grawert wrote:
> > > The AppArmor patches that we ported from the
> > > http://kernel.ubuntu.com/git/ppisati/ubuntu-vivid.git/tree/arch/arm/c
> > > onfigs/snappy?h=snappy_v3.10
> > >
> > > are for the linux kernel 3.10.
> > >
> > > But the kernel that we are referring to is from 96boards - linux
> > > kernel 4.4.
> >
> > this is definitely wrong, for 4.4 kernels you indeed need to use a 4.4
> > patch set, another thing for paolo to answer (i'm not even sure you
> > need any patches at all on a 4.4 kernel, all bits might be in-tree
> > already and just some config options might be enough)...
>
> Unfortunately he is not using our Xenial kernel, so he still needs some patches
> for AA - here's a updated delta of patches on top of stable/linux-4.4.y:
>
> https://github.com/piso77/sample-kernels/commits/stable-4.4.y
>
We downloaded the kernel source from: https://github.com/piso77/sample-kernels.git

Checked out the "stable-4.4.y" branch. The kernel version is 4.4.50
(Blurry Fish Butt).

This kernel has all the latest patches that you have mentioned.

So, we just ran the below commands to merge our defconfig with snappy,
and distro.config:

ARCH=arm64 ./scripts/kconfig/merge_config.sh arch/arm64/configs/defconfig kernel/configs/distro.config

cp .config arch/arm64/configs/defconfig

ARCH=arm64 ./scripts/kconfig/merge_config.sh arch/arm64/configs/defconfig kernel/configs/snappy/*.config

cp .config arch/arm64/configs/defconfig

Then checked in the code.

Our snapcraft.yaml is at: http://pastebin.com/Na76t2ks

<http://pastebin.com/Na76t2ks>We are able to build the kernel snap successfully. Build
logs at: http://pastebin.com/fphxyh46

We are able to build the ubuntu os snap successfully by using the
kernel snap from your kernel and gadget snap from the older source
that we had got.

But when we boot the kernel, we are getting stuck in kernel boot. It
seems the kernel is not getting the initrd. The bootlogs are
at: http://pastebin.com/eF2sCiyJ

Can you please let us know if we are missing something ?

Also, the dts files are different as compared to the 4.4.23 kernel source.
So is there some work ongoing. Because the prebuilt binaries has already
SMP booting enabled, while the current latest kernel version has only a
primary core booting.

> depending of the 4.4.x revision you are using, if you apply all the patches
> above the "Linux 4.4.50" commit, you will  get all you need.
>
Are we missing any patches that you are referring to as we have
pulled the latest kernel ?

One more observation:
We are using the below command to build the kernel using snapcraft.yaml:
  sudo snapcraft --target-arch arm64 snap

So, if we want to do a incremental build for the kernel, how can we achieve that ?

Thanks,
Sunny

<http://pastebin.com/eF2sCiyJ>

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