meta-crownbay: new layer for E6xx/EG20T systems

This layer provides support for Tunnel Creek + Topcliff Intel systems
to laverne (0.90).

It supports the E6xx embedded on-chip graphics via the Intel Embedded
Media and Graphics Driver (EMGD) 1.5 Gold Driver.

The EMGD and EG20T PCH kernel drivers are of course GPL'ed and are
submitted in a separate patchset for the 2.6.34 yocto kernel.

The userspace X drivers and supporting libraries however are closed
and need to be manually copied into the layer before building.  The
details on how to do this can be found in the README doc in
meta-crownbay/.

Signed-off-by: Tom Zanussi <tom.zanussi@intel.com>

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+This README file contains information on building the meta-crownbay
+BSP layer, and booting the images contained in the /binary directory.
+Please see the corresponding sections below for details.
+
+
+Table of Contents
+=================
+
+  I. Building the meta-crownbay BSP layer
+ II. Special notes for building the meta-crownbay BSP layer
+III. Booting the images in /binary
+
+
+I. Building the meta-crownbay BSP layer
+=======================================
+
+For each BSP in the 'meta-intel' repository, there are multiple
+branches, one corresponding to each major release starting with
+'laverne' (0.90), in addition to the latest code which tracks the
+current master.
+
+In order to build an image with BSP support for a given release, you
+need to check out the 'meta-intel' branch corresponding to the release
+you're building against e.g. to build for laverne (0.90), check out
+the 'laverne' branch of both poky and 'meta-intel'.
+
+Having done that, and assuming you cloned the 'meta-intel' repository
+at the top-level of your yocto build tree, you can build a crownbay
+image by adding the location of the meta-crownbay layer to
+bblayers.conf e.g.:
+
+  yocto/meta-intel/meta-crownbay \
+
+To enable the crownbay layer, add the crownbay MACHINE to local.conf:
+
+  MACHINE ?= "crownbay"
+
+You should then be able to build a crownbay image as such:
+
+  $ source poky-init-build-env
+  $ bitbake poky-image-sato-live
+
+At the end of a successful build, you should have a live image that
+you can boot from a USB flash drive (see instructions on how to do
+that below, in the section 'Booting the images from /binary').
+
+
+II. Special notes for building the meta-crownbay BSP layer
+==========================================================
+
+The meta-crownbay layer makes use of the proprietary Intel EMGD
+userspace drivers, which at this point in time require that the user
+accept the Intel license by manually extracting the binaries and
+copying them to the proper location in the meta-crownbay layer.
+
+There currently isn't an automated way to do this, thus the manual
+step.  When Yocto supports a click-through installation mechanism, the
+binary files will be packaged as part of the recipe, and this step
+will be unnecessary.
+
+These steps require that you run a graphical application in Windows.
+Windows 7 was used for these instructions, but it shouldn't matter
+which version of Windows you use.
+
+The first step of the process is to download the EMGD 1.5 Gold Driver.
+Here is the current link to the URL which it can be downloaded from:
+
+http://edc.intel.com/Software/Downloads/EMGD/
+
+In the Download Now tab, select:
+
+Intel® architecture-based product: Intel Atom Processor E6XX Series
+Operating System: MeeGo 1.0 IVI Linux (kernel 2.6.33.3, X.server 1.8.0)
+
+That will give you a large zip file:
+
+IEMGD_1_5_GOLD_ALL_1742.zip
+
+Extract the files in the zip file, which will in turn give you a large
+.exe file:
+
+IEMGD_1_5_GOLD_ALL_1742.exe
+
+Run IEMGD_1_5_GOLD_ALL_1742.exe to install, accept licenses, etc.
+
+If it says to install watcom, follow the instructions to do that.
+
+When the installation completes, an application named "emgd-ced" will
+be present in the install directory.  Double-click to run it.
+
+Select the menu item: New Configuration
+
+In the tabbed page, make the following selections and/or enter the
+specified data:
+
+Configuration File Name: myconfig
+Platform Chipset: Intel Atom Processor E6xx
+Port Devices: LVDS, sDVO
+
+Hit the 'Next' button.
+
+On the next tabbed page, make the following selections and/or enter
+the specified data:
+
+Readable Port Name: portname0
+Encoder Configuration: Select sDVO Device: Internal LVDS
+
+Hit the 'Finish' button.
+
+Select the menu item: New Package
+
+In the tabbed page, make the following selections and/or enter the
+specified data:
+
+Package File Name: mypackage
+Configurations: selec myconfig.cnfg
+Target OS: Linux operating System
+
+Hit the 'Finish' button.
+
+Select the menu item: Generate Installation
+
+This will create the EMGD installation package:
+
+Generating EMGD installation...
+
+The installation package should now be under the 'workspace'
+subdirectory of the directory you installed to:
+
+workspace/installation/mypackage.pkg_installation/IEMGD_HEAD_Linux/IEMGD_HEAD_Linux.tgz
+
+This is the file you are interested in.  Copy it to your Poky build
+system, and uncompress/untar it:
+
+$ tar cvfz IEMGD_HEAD_Linux.tgz
+
+Finally, copy Xorg-xserver binaries in the Meego1.0 driver directory
+to the xserver-xf86-emgd-bin directory in the meta-crownbay layer:
+
+$ cp IEMGD_HEAD_Linux/MeeGo1.0/driver/Xorg-xserver-1.7.99/* meta-crownbay/recipes/xorg-xserver/xserver-xf86-emgd-bin
+
+You also need to copy the IEMGD License.txt file to the same directory:
+
+$ cp IEMGD_HEAD_Linux/License/License.txt meta-crownbay/recipes/xorg-xserver/xserver-xf86-emgd-bin
+
+At this point, you should be able to build meta-crownbay images as usual.
+
+----
+
+For reference, the EMGD Driver documentation is also available at the
+above link (it's also part of the installation).
+
+The specific text of the document is:
+
+User Guide: Intel® Embedded Media and Graphics Driver, EFI Video
+Driver, EPOG, and Video BIOS v1.5 for Windows* XP and Linux* Provides
+installation requirements/procedures & describes the vbios/firmware,
+configuration options, & functionality of Intel® EMGD under Windows* &
+Linux*. Refer to guide for details.
+
+File Type/Size: PDF 3,340KB
+Version: 008 : October 2010
+
+
+II. Booting the images in /binary
+=================================
+
+This BSP contains bootable live images, which can be used to directly
+boot Yocto off of a USB flash drive.
+
+Under Linux, insert a USB flash drive.  Assuming the USB flash drive
+takes device /dev/sdf, use dd to copy the live image to it.  For
+example:
+
+# dd if=poky-image-sato-live-crownbay-20101207053738.hddimg of=/dev/sdf
+# sync
+# eject /dev/sdf
+
+This should give you a bootable USB flash device.  Insert the device
+into a bootable USB socket on the target, and power on.  This should
+result in a system booted to the Sato graphical desktop.
+
+If you want a terminal, use the arrows at the top of the UI to move to
+different pages of available applications, one of which is named
+'Terminal'.  Clicking that should give you a root terminal.
+
+If you want to ssh into the system, you can use the root terminal to
+ifconfig the IP address and use that to ssh in.  The root password is
+empty, so to log in type 'root' for the user name and hit 'Enter' at
+the Password prompt: and you should be in.
+
+----
+
+If you find you're getting corrupt images on the USB (it doesn't show
+the syslinux boot: prompt, or the boot: prompt contains strange
+characters), try doing this first:
+
+# dd if=/dev/zero of=/dev/sdf bs=1M count=512