!18 temporary solution for Xenomai support

temporary soltuion for Xenomai support on Phytium CPU

configs/phytium_ubuntu_desktop_defconfig

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+# Architecture
+BR2_aarch64=y
+BR2_cortex_a53=y
+
+# Filesystem
+BR2_TARGET_ROOTFS_EXT2=y
+BR2_TARGET_ROOTFS_EXT2_4=y
+BR2_TARGET_ROOTFS_EXT2_SIZE="5G"
+BR2_ROOTFS_POST_IMAGE_SCRIPT="board/phytium/post-image.sh support/scripts/genimage.sh"
+BR2_ROOTFS_POST_SCRIPT_ARGS="-c board/phytium/genimage-e2000.cfg"
+
+
+# custom skeleton
+BR2_ROOTFS_SKELETON_CUSTOM=y
+BR2_ROOTFS_SKELETON_UBUNTU=y
+BR2_ROOTFS_POST_CUSTOM_SKELETON_SCRIPT="board/phytium/common/post-custom-skeleton-ubuntu-20.04.sh"
+BR2_ROOTFS_POST_BUILD_SCRIPT="board/phytium/common/post-build.sh"
+BR2_INIT_NONE=y
+BR2_ENABLE_LOCALE_PURGE=n
+BR2_ROOTFS_CHOWN=y
+
+# Hostname and issue
+BR2_TARGET_GENERIC_HOSTNAME="Phytium"
+BR2_TARGET_GENERIC_ISSUE="Welcome to Phytium Buildroot"
+
+# toolchain
+BR2_TOOLCHAIN_EXTERNAL=y
+BR2_TOOLCHAIN_EXTERNAL_ARM_AARCH64=y
+BR2_TOOLCHAIN_USES_GLIBC=y
+BR2_TOOLCHAIN_EXTERNAL_GLIBC=y
+
+# Linux headers same as kernel
+BR2_PACKAGE_HOST_LINUX_HEADERS_CUSTOM_4_19=y
+
+# Kernel
+BR2_LINUX_KERNEL=y
+BR2_LINUX_KERNEL_CUSTOM_GIT=y
+BR2_LINUX_KERNEL_CUSTOM_REPO_URL="https://gitee.com/phytium_embedded/phytium-linux-kernel.git"
+# kernel 5.10
+BR2_LINUX_KERNEL_CUSTOM_REPO_VERSION="kernel_5.10-v1.1"
+BR2_LINUX_KERNEL_INTREE_DTS_NAME="phytium/e2000d-demo-board phytium/e2000d-miniitx-board phytium/e2000d-power-board phytium/e2000q-come-board  phytium/e2000q-demo-board phytium/e2000q-edu-board  phytium/e2000q-hanwei-board phytium/e2000q-miniitx-board phytium/e2000q-vpx-board phytium/e2000s-demo-board"
+BR2_LINUX_KERNEL_DTS_SUPPORT=y
+BR2_LINUX_KERNEL_DEFCONFIG="phytium"
+BR2_LINUX_KERNEL_IMAGE_TARGET_CUSTOM=y
+BR2_LINUX_KERNEL_IMAGE_TARGET_NAME="Image"
+BR2_LINUX_KERNEL_NEEDS_HOST_OPENSSL=y
+BR2_ROOTFS_LINUX_HEADERS=y
+
+# Bootloader
+BR2_TARGET_GRUB2=y
+BR2_TARGET_GRUB2_ARM64_EFI=y
+
+
+# Serial port config
+BR2_TARGET_GENERIC_GETTY=y
+BR2_TARGET_GENERIC_GETTY_PORT="ttyAMA0"
+
+# required tools to create the microSD image
+BR2_PACKAGE_HOST_DOSFSTOOLS=y
+BR2_PACKAGE_HOST_GENIMAGE=y
+BR2_PACKAGE_HOST_MTOOLS=y
+
+BR2_PACKAGE_ROOTFS_DESKTOP=y
+BR2_PACKAGE_BUSYBOX=n

configs/phytium_xenomai_cobalt_5.10.config

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+# cobalt kernel 5.10.153-dovetail3
+BR2_LINUX_KERNEL_CUSTOM_REPO_URL="https://gitee.com/phytium_embedded/linux-kernel-xenomai.git"
+BR2_LINUX_KERNEL_CUSTOM_REPO_VERSION="087481d1b92af5be516b1b04938738d9ba82cbcd"
+BR2_LINUX_KERNEL_CONFIG_FRAGMENT_FILES="$(LINUX_DIR)/arch/arm64/configs/cobalt.config"
+# xenomai libraries and tools
+BR2_PACKAGE_XENOMAI=y
+BR2_PACKAGE_XENOMAI_CUSTOM_TARBALL=y
+BR2_PACKAGE_XENOMAI_CUSTOM_TARBALL_URL="https://source.denx.de/Xenomai/xenomai/-/archive/v3.2.2/xenomai-v3.2.2.tar.gz"
+BR2_PACKAGE_XENOMAI_COBALT=y
+BR2_PACKAGE_XENOMAI_ENABLE_SMP=y
+BR2_PACKAGE_XENOMAI_ADDITIONAL_CONF_OPTS="--enable-pshared"
+BR2_PACKAGE_XENOMAI_TESTSUITE=y
+BR2_PACKAGE_XENOMAI_RTCAN=y
+BR2_PACKAGE_XENOMAI_ANALOGY=y