Introduce meta-arm-image layer

Introduce meta-arm-image layer for OpenEmbedded.

meta-arm-image:
- This layer provides a common image shared between Corstone1000 Arm platforms.
- The image is called corstone1000-image.
- Each platform can extend corstone1000-image by including inc files to provide
  custom image settings tailored to the selected machine.

Signed-off-by: Xueliang Zhong <xueliang.zhong@arm.com>

README.md

-# meta-arm-image
+Introduction
+------------
+This repository contains meta-arm-image layer for OpenEmbedded
 
+meta-arm-image:
+	This layer provides a common image shared between Corstone1000 Arm platforms.
+	The image is called corstone1000-image.
+	Each platform can extend corstone1000-image by including inc files to provide
+	custom image settings tailored to the selected machine.
+
+For more information please contact the maintainers.
+
+Maintainer(s)
+-------------
+* Jon Mason <jon.mason@arm.com>
+* Rui Miguel Silva <rui.silva@arm.com>
+* Abdellatif El Khlifi <abdellatif.elkhlifi@arm.com>

classes/wic_nopt.bbclass

+# This class removes the empty partition table header
+# in the WIC file when --no-table WKS option is used
+
+IMAGE_TYPES += "wic.nopt"
+
+CONVERSIONTYPES += "nopt"
+
+# 1024 bytes are skipped which corresponds to the size of the partition table header to remove
+CONVERSION_CMD:nopt = "tail -c +1025 ${IMAGE_NAME}${IMAGE_NAME_SUFFIX}.${type} >  ${IMAGE_NAME}${IMAGE_NAME_SUFFIX}.${type}.nopt"

conf/layer.conf

+# SPDX-License-Identifier: MIT
+#
+# Copyright (c) 2021 Arm Limited
+#
+
+# We have a conf and classes directory, add to BBPATH
+BBPATH .= ":${LAYERDIR}"
+
+# We have recipes-* directories, add to BBFILES
+BBFILES += "${LAYERDIR}/recipes-*/*/*/*.bb \
+            ${LAYERDIR}/recipes-*/*/*/*.bbappend"
+
+BBFILE_COLLECTIONS += "meta-arm-image"
+BBFILE_PATTERN_meta-arm-image := "^${LAYERDIR}/"
+LAYERDEPENDS_meta-arm-image = "meta-arm-bsp"
+LAYERSERIES_COMPAT_meta-arm-image = "gatesgarth hardknott honister"

recipes-core/images/corstone1000/corstone1000-image.bb

+SUMARY = "Corstone1000 platform Image"
+DESCRIPTION = "This is the main image which is the container of all the binaries \
+               generated for the Corstone1000 platform."
+LICENSE = "MIT"
+
+inherit core-image
+inherit wic_nopt
+
+IMAGE_FEATURES += "debug-tweaks"
+
+IMAGE_FSTYPES += "wic wic.nopt"

recipes-core/images/corstone1000/corstone1000-initramfs-image.bb

+SUMARY = "Corstone1000 platform Initramfs Image"
+DESCRIPTION = "This is the main Linux image which includes an initramfs kernel/rootfs bundle."
+
+LICENSE = "MIT"
+
+IMAGE_FSTYPES = "${INITRAMFS_FSTYPES}"
+
+inherit core-image
+
+# By default all basic packages required for a bootable system are installed
+# by core-image . These packages are: packagegroup-core-boot and
+# packagegroup-base-extended
+
+inherit image-buildinfo
+
+IMAGE_FEATURES += "debug-tweaks"
+
+# deleting the /usr/lib/opkg/alternatives folder
+# because we do not need alternative commands to what
+# busybox offers. This saves around 1MB flash
+remove_alternative_files () {
+    rm -rf ${IMAGE_ROOTFS}/usr/lib/opkg
+}
+ROOTFS_POSTPROCESS_COMMAND += "remove_alternative_files;"
+
+#package management is not supported in corstone1000
+IMAGE_FEATURES:remove = "package-management"
+
+# all optee packages
+IMAGE_INSTALL += "optee-client"
+
+# FF-A Debugfs driver
+IMAGE_INSTALL += "ffa-debugfs-mod"
+
+#
+# images inheriting image.bbclass are forced to have do_populate_sysroot dependency from the recipes 
+# listed under EXTRA_IMAGEDEPENDS
+# initramfs image doesn't need to use sysroot data provided by EXTRA_IMAGEDEPENDS recipes
+# The code below sets the right dependency of do_image_complete task
+# This prevents dependency loops
+#
+python () {
+    if d.getVar('IMAGE_BASENAME') == "corstone1000-initramfs-image":
+        d.setVarFlag('do_image_complete', 'depends', 'corstone1000-initramfs-image:do_image')
+}

wic/corstone1000-image.corstone1000.wks

+# WIC partitioning for corstone1000
+# Layout and maximum sizes (to be defined):
+#
+
+part --source rawcopy --sourceparams="file=bl2_signed.bin" --align 1 --no-table --fixed-size 64k
+part --source rawcopy --sourceparams="file=bl2_signed.bin" --align 1 --no-table --fixed-size 64k
+
+part --source rawcopy --sourceparams="file=tfm_s_signed.bin" --align 1 --no-table --fixed-size 384k
+part --source rawcopy --sourceparams="file=tfm_s_signed.bin" --align 1 --no-table --fixed-size 384k
+
+# Rawcopy of the FIP binary
+part --source rawcopy --sourceparams="file=signed_fip-corstone1000.bin" --align 1 --no-table --fixed-size 2
+
+# Rawcopy of kernel with initramfs
+part --source rawcopy --sourceparams="file=Image-initramfs-${MACHINE}.bin" --no-table --fixed-size 12
+
+#bootloader --ptable gpt