arm/machine: create generic-arm64 machine

Create a generic Arm64 system for creating a SystemReady file system.
Due to it being as generic as possible, the image created
by this should run on any hardware that already has the requisite
firmware present.

Change-Id: Ie0d71f91145311e90d228bc403e653a7ef059838
Signed-off-by: Jon Mason <jon.mason@arm.com>

.gitlab-ci.yml

@@ -76,6 +76,9 @@ gem5-arm64:
 gem5-arm64-xen:
   extends: .build
 
+generic-arm64:
+  extends: .build
+
 juno:
   extends: .build
 

kas/generic-arm64.yml

@@ -0,0 +1,6 @@
+header:
+  version: 9
+  includes:
+    - base.yml
+
+machine: generic-arm64

meta-arm/conf/machine/generic-arm64.conf

@@ -0,0 +1,23 @@
+#@TYPE: Machine
+#@NAME: generic-arm64
+#@DESCRIPTION: Generic Arm64 machine for creating rootfs that should work on all arm64 hardware
+
+require conf/machine/include/arm/arch-armv8a.inc
+
+SERIAL_CONSOLES ?= "115200;ttyAMA0"
+SERIAL_CONSOLES_CHECK = "${SERIAL_CONSOLES}"
+
+PREFERRED_PROVIDER_virtual/kernel ?= "linux-yocto"
+PREFERRED_VERSION_linux-yocto ?= "5.10%"
+
+KERNEL_IMAGETYPE = "Image"
+
+IMAGE_BOOT_FILES = "${KERNEL_IMAGETYPE}"
+IMAGE_FSTYPES ?= "wic"
+
+WKS_FILE ?= "mkefidisk.wks"
+
+MACHINE_FEATURES += "efi"
+
+KBUILD_DEFCONFIG = "defconfig"
+KCONFIG_MODE = "--alldefconfig"

meta-arm/recipes-kernel/linux/linux-yocto_%.bbappend

@@ -3,3 +3,9 @@ FILESEXTRAPATHS_prepend := "${THISDIR}:${THISDIR}/linux-yocto:"
 SRC_URI_append_qemuarm64-sbsa = " \
     file://defconfig.patch \
     "
+
+COMPATIBLE_MACHINE_generic-arm64 = "generic-arm64"
+
+SRC_URI_append_generic-arm64 = " \
+    file://defconfig.patch \
+    "