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 <ma...@canonical.com> wrote: > > > On Tue, Nov 15, 2016 at 8:17 PM, Peng Liu <pengliu.m...@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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