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I am a newbie to the Linux kernel compilation and I am trying to create an Ubuntu core image. Although there is an image for Intel Joule I want to compile one of my own as I ll patch some changes later on in my project so it is good to know how to build using snapcraft.

I have followed the steps according to the "Board enablement overview" page from Ubuntu core.

Compiled the kernel snap (I took one of the reference kernel snaps available here), and the gadget snap from here.

Created the Json file and created the image as per the link but when I flashed it on a sd card and tried to boot. It hangs after I select Ubuntu core from the Grub menu. Am I missing any key things to be done or configured. The kernel from Git hub is supposed to be configured for x86_64 architecture.

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There are gadget and kernel for Intel Joule in the store. The name of gadget is joule as well as the kernel is joule-linux. You can use these two snaps in your model assertion and built your own image. – Robert Liu Apr 27 '17 at 7:54
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i'd suggest to try each snap on its own ...

i.e. build the gadget, build an image with the official pc kernel, see if that boots ...

https://docs.ubuntu.com/core/en/guides/build-device/image-building

only then start playing with your own kernel ...

also, the new location for the official amd64 gadget is at:

https://github.com/snapcore/pc-amd64-gadget

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Thanks for that info. I tried as you mentioned. Built the gadget snap and took the official kernel but I ended up with this message from Grub error: not a regular file. error: no server is specified. alloc magic is broken at 0x6b38ab00: 6b2d6420 Aborted. Press any key to exit. Later I tried to get official pc gadget and pc kernel so I just wrote the Json file, signed the assertion and built the image. The result was still the same. Is there an official Joule gadget or the Joule-Linux kernel available somewhere on Github or Intel support page ? That would make life lot easier.. – Nitin Kulkarni Feb 20 '17 at 12:05

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