arm/edk2-firmware: set a default invalid COMPATIBLE_MACHINE

Building edk2-firmware needs explicit configuration for the target
machine, so set an invalid COMPATIBLE_MACHINE to stop edk2-firmware
building for, example, qemumips.

sbsa-acs is an application, so unset COMPATIBLE_MACHINE in that recipe
as it will work on all aarch64 targets.

Signed-off-by: Ross Burton <ross.burton@arm.com>
Signed-off-by: Jon Mason <jon.mason@arm.com>

meta-arm/recipes-bsp/uefi/edk2-firmware.inc

@@ -22,6 +22,9 @@ SRC_URI = "\
 SRCREV_FORMAT         = "edk2_edk2-platforms"
 UPSTREAM_CHECK_GITTAGREGEX = "^edk2-stable(?P<pver>\d+)$"
 
+COMPATIBLE_MACHINE ?= "invalid"
+PACKAGE_ARCH = "${MACHINE_ARCH}"
+
 EDK2_BUILD_RELEASE = ""
 EDK2_PLATFORM      = "unset"
 # build --platform
@@ -50,8 +53,6 @@ inherit deploy
 S = "${WORKDIR}/edk2"
 B = "${WORKDIR}/build"
 
-PACKAGE_ARCH = "${MACHINE_ARCH}"
-
 LDFLAGS[unexport] = "1"
 
 do_configure[cleandirs] += "${B}"

meta-arm/recipes-bsp/uefi/sbsa-acs_3.0.bb

@@ -13,7 +13,9 @@ SRC_URI += "git://github.com/ARM-software/sbsa-acs;destsuffix=edk2/ShellPkg/Appl
 SRCREV_acs = "1b3a37214fe6809e07e471f79d1ef856461bc803"
 SRCREV_libc = "61687168fe02ac4d933a36c9145fdd242ac424d1"
 
+COMPATIBLE_MACHINE = ""
 COMPATIBLE_HOST = "aarch64.*-linux"
+
 EDK2_PLATFORM = "Shell"
 EDK2_PLATFORM_DSC = "ShellPkg/ShellPkg.dsc"
 EDK2_EXTRA_BUILD = "--module ShellPkg/Application/sbsa-acs/uefi_app/SbsaAvs.inf"