iota: add distro related cofiguration

Add distro configuration and images recipes for tiny and core image for
iota distribution.

Change-Id: I31df5009dbd67b03016150833cc1a6905caa9ca2
Signed-off-by: Rui Miguel Silva <rui.silva@linaro.org>

meta-iota/README.md

@@ -0,0 +1,60 @@
+# Iota OS
+
+This is meta layer dedicated to support Arm fast models.
+
+# Iota setup
+
+The way to start the setup to build the distribution is to fetch the
+iota-manifest. For that, first install repo tool from google:
+
+```
+curl http://commondatastorage.googleapis.com/git-repo-downloads/repo > /tmp/repo
+sudo install -m 0755 /tmp/repo /usr/local/bin/repo;
+```
+
+and then fetch the manifest:
+```
+mkdir ~/iota; cd ~/iota
+repo init -u oteutoehuote -b master -m default.xml
+repo sync
+```
+
+after setup the following environment variables to set the distribution and the
+machine type of the build, for now only vexpress-a32 is totally tested, but
+others will follow:
+
+```
+export DISTRO="iota"
+export MACHINE="vexpress-a32"
+```
+
+Then prepare the environment to run the build, in the top directory
+
+```
+source setup-environment
+```
+
+This will create and put you ready to start the build in a topdir/build-iota
+directory, to start the build just type:
+
+```
+bitbake iota-tiny-image
+```
+
+The first build is long and can take several minutes to conclude, when finished
+check the resulted binaries in the deploy directory
+
+```
+ ~/iota/build-iota/tmp-iota/deploy/images/vexpress-a32/
+```
+
+To load the resulted flash img in the FVP model
+
+```
+YOCTO_OUTDIR=~/iota/build-iota/tmp-iota/deploy/images/vexpress-a32
+
+./host/FVP_Base_Cortex-A32x1 \
+	-C bp.secureflashloader.fname=${YOCTO_OUTDIR}/bl1.bin \
+	-C bp.flashloader0.fname=${YOCTO_OUTDIR}/iota-tiny-image-vexpress-a32.wic
+
+```

meta-iota/conf/distro/iota-tiny.conf

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+# SPDX-License-Identifier: MIT
+#
+# Copyright (c) 2019 Arm Limited
+#
+
+require conf/distro/poky-tiny.conf
+
+DISTRO_NAME = "Iota - Tiny Linux Distribution"
+DISTRO = "iota-tiny"
+DISTRO_VERSION = "0.1"
+
+INHERIT += "image-buildinfo"
+
+TCLIBC = "musl"

meta-iota/conf/layer.conf

@@ -0,0 +1,18 @@
+# SPDX-License-Identifier: MIT
+#
+# Copyright (c) 2019 Arm Limited
+#
+
+# iota has a conf and classes directory, add to BBPATH
+BBPATH .= ":${LAYERDIR}"
+
+# iota has a packages directory, add to BBFILES
+BBFILES += " \
+		${LAYERDIR}/recipes-*/*/*.bb \
+		${LAYERDIR}/recipes-*/*/*.bbappend"
+
+BBFILE_COLLECTIONS += "iota"
+BBFILE_PATTERN_iota := "^${LAYERDIR}/"
+BBFILE_PRIORITY_iota = "14"
+LAYERSERIES_COMPAT_iota = "warrior"
+

meta-iota/recipes-core/images/iota-tiny-image.bb

@@ -0,0 +1,43 @@
+# SPDX-License-Identifier: Apache-2.0
+#
+# Copyright (c) 2019 Linaro, LLC
+# Copyright (c) 2019 Arm Limited
+#
+# Iota Recipe to build tiny minimal image
+#
+
+SUMARY = "Iota Tiny Minimal Image"
+DESCRIPTION = "Tiny Linux image for Iota Distribution"
+LICENSE = "MIT"
+
+IMAGE_LINGUAS = " "
+IMAGE_FEATURES += "debug-tweaks"
+IMAGE_FSTYPES += " wic"
+DEPENDS += "u-boot-mkimage-native"
+
+inherit core-image
+
+# Remove Partition table if wic image is generated
+do_cleanup_partition_table() {
+       echo "check if partition table exits in wic image"
+       header=$(head -c 4  ${IMGDEPLOYDIR}/${IMAGE_NAME}.rootfs.wic | md5sum -b | cut -d ' ' -f1)
+
+       if [ ${header}=="d9a7c187f1dc40d183b645f61daa500f" ]; then
+                 echo "remove partition table from wic image"
+          tail -c +1025 ${IMGDEPLOYDIR}/${IMAGE_NAME}.rootfs.wic > ${IMGDEPLOYDIR}/${IMAGE_NAME}.rootfs.img
+          mv ${IMGDEPLOYDIR}/${IMAGE_NAME}.rootfs.img ${IMGDEPLOYDIR}/${IMAGE_NAME}.rootfs.wic
+       fi
+}
+addtask do_cleanup_partition_table after do_image_wic before do_image_complete
+
+do_image_make_ramfs() {
+        echo "adding uboot header to cpio.gz"
+        mkimage -A arm -O linux -C none -T ramdisk -n ramdisk -a 0x84000000 -e 0x84000000 -n "Iota Ramdisk" -d  ${IMGDEPLOYDIR}/${IMAGE_NAME}.rootfs.cpio.gz ${IMGDEPLOYDIR}/${IMAGE_NAME}.rootfs.initramfs.cpio.gz
+        cd ${IMGDEPLOYDIR}; ln -s ${IMAGE_NAME}.rootfs.initramfs.cpio.gz ${IMAGE_LINK_NAME}.initramfs.cpio.gz
+}
+
+do_image_make_ramfs_corstone700() {
+	echo "u-boot not present in corstone700"
+}
+
+addtask do_image_make_ramfs after do_image_cpio before do_image_wic