Building and installing a custom kernel for Samsung Arm Chromebook Fedora 18

* This is an outline of the steps, but is currently untested.
It based off of information of
https://plus.google.com/u/0/109993695638569781190/posts/34PYU79eUqP


1) Need a vboot-utils binaries on the machine.  A rough version
vboot-utils src rpm is available from:

http://people.redhat.com/wcohen/chromebook/vboot-utils-20130129git68f54d4-4.fc17.src.rpm

   (Jon Disnard (masta) is working on a more official Fedora version listed
   in https://bugzilla.redhat.com/show_bug.cgi?id=893866)

1a) build vboot-utils:
    # yumbuild-deps ./vboot-utils-*.rpm
    $ rpm -Uvh ./vboot-utils-*.rpm
    $ cd ~/rpmbuild/SPECS/
    $ rpmbuild -ba vboot-utils.spec

1b) install vboot-utils:

    # yum install ~/rpmbuild/RPMS/*/vboot-utils.*.rpm

1c) You will also  need uboot-tools:

    # yum install uboot-tools

2) Get the source chrome book linux kernel:

  git clone https://git.chromium.org/git/chromiumos/third_party/kernel.git
  git checkout chromeos-3.4

3) Get the appropriate .config for the chromebook as a staring point:

  $ cd kernel
  $ ./chromeos/scripts/prepareconfig chromeos-exynos5

  Modify the .config file to taste and then reconfigure:

  $ make oldconfig

4) Build the actual kernel AND the device tree:

  $ make -j2
  $ make exynos5250-snow.dtb

5) Install the modules and :

  # export root=<path_to_root>
  # make INSTALL_MOD_PATH=$root modules_install install
  # cp ./arch/arm/boot/exynos5250-snow.dtb arch/arm/boot/zImage ${root}/boot

6a) Get a kernel.its file:

   $ wget http://people.redhat.com/wcohen/chromebook/vboot-utils-20130129git68f54d4-4.fc17.src.rpm
   

6b) Create the kernel.itb file from kernel.its:

   $ wget http://people.redhat.com/wcohen/chromebook/kernel.its
   $ mkimage -f kernel.its kernel.itb


7) Create appropriate configure:

   $ export device=/dev/mmcblk1
   $ export partition=3
   $ export rootfs=${device}p${partition}
   $ echo "console=tty1 debug verbose root=$rootfs rootwait rw lsm.module_locking=0" > config.txt

8) Sign the kernel with the vboot-utils so the samsung chromebook:


   $ vbutil_kernel --pack /tmp/newkernel \
      --keyblock /usr/share/vboot/devkeys/kernel.keyblock \
      --version 1 \
      --signprivate /usr/share/vboot/devkeys/kernel_data_key.vbprivk \
      --config config.txt --vmlinuz kernel.itb --arch arm

9) Copy the kernel on appropriate partition (BE SURE TO GET CORRECT
DEVICE AND PPARTITION):

  # export device=/dev/mmcblk1
  # export partition=1
  # dd if=/tmp/newkernel of=${device}p${partition}

10) Enable the partion to boot:

  # cgpt add -i ${partition} -P 15 -S 1 -T 1 ${device}

11) Shutdown and reboot machine.