boot: add BR2_TARGET_XILINX_FIRMWARE_ARCH_SUPPORTS

Currently, the xilinx-embeddedsw and xilinx-prebuilt packages are appearing
for any aarch64 processor. As all Xilinx processors that need these packages
are ARM Cortex-A53 or ARM Cortex-A72, this means that these packages are
often appearing as options for non-Xilinx platforms.

To reduce this occurrence, this patch creates a new symbol
BR2_TARGET_XILINX_FIRMWARE_ARCH_SUPPORTS to limit the appearance of the
xilinx-embeddedsw and xilinx-prebuilt boot packages to only platforms based
on the BR2_cortex_a53 or BR2_cortex_a72 CPU and aarch64 architecture.

Signed-off-by: Neal Frager <neal.frager@amd.com>
Reviewed-by: Luca Ceresoli <luca.ceresoli@bootlin.com>
Signed-off-by: Julien Olivain <ju.o@free.fr>

boot/Config.in

@@ -1,3 +1,11 @@
+config BR2_TARGET_XILINX_FIRMWARE_ARCH_SUPPORTS
+	bool
+	default y
+	# All Xilinx SoCs using this package are aarch64 only
+	depends on BR2_aarch64
+	# only CPUs with corresponding firmwares:
+	depends on BR2_cortex_a53 || BR2_cortex_a72
+
 menu "Bootloaders"
 
 source "boot/afboot-stm32/Config.in"
@@ -19,7 +27,10 @@ source "boot/ti-k3-boot-firmware/Config.in"
 source "boot/ti-k3-r5-loader/Config.in"
 source "boot/uboot/Config.in"
 source "boot/vexpress-firmware/Config.in"
+
+if BR2_TARGET_XILINX_FIRMWARE_ARCH_SUPPORTS
 source "boot/xilinx-embeddedsw/Config.in"
 source "boot/xilinx-prebuilt/Config.in"
+endif
 
 endmenu

boot/xilinx-embeddedsw/Config.in

@@ -1,11 +1,9 @@
 comment "xilinx-embeddedsw needs a bare metal toolchain for tuple microblazeel-buildroot-elf"
 	depends on BR2_TOOLCHAIN_BARE_METAL_BUILDROOT_ARCH != "microblazeel-buildroot-elf"
-	depends on BR2_aarch64
 	depends on BR2_TOOLCHAIN_BARE_METAL_BUILDROOT
 
 menuconfig BR2_TARGET_XILINX_EMBEDDEDSW
 	bool "xilinx-embeddedsw"
-	depends on BR2_aarch64
 	depends on BR2_TOOLCHAIN_BARE_METAL_BUILDROOT
 	help
 	  Build boot firmware applications from source for Xilinx

boot/xilinx-prebuilt/Config.in

@@ -1,6 +1,5 @@
 menuconfig BR2_TARGET_XILINX_PREBUILT
 	bool "xilinx-prebuilt"
-	depends on BR2_aarch64
 	help
 	  Pre-built firmware files for Xilinx boards.