brcm27xx-armstub: add new package

This package is needed for RPi 4B AARCH64 support

Signed-off-by: Álvaro Fernández Rojas <noltari@gmail.com>

package/kernel/brcm27xx-armstub/Makefile

@@ -0,0 +1,54 @@
+#
+# Copyright (C) 2019 OpenWrt.org
+#
+# This is free software, licensed under the GNU General Public License v2.
+# See /LICENSE for more information.
+#
+
+include $(TOPDIR)/rules.mk
+include $(INCLUDE_DIR)/kernel.mk
+
+PKG_NAME:=brcm27xx-armstub
+
+PKG_SOURCE_PROTO:=git
+PKG_SOURCE_URL=https://github.com/raspberrypi/tools
+PKG_SOURCE_DATE:=2019-05-09
+PKG_SOURCE_VERSION:=49719d5544cd33b8c146235e1420f68cd92420fe
+PKG_MIRROR_HASH:=91e9d14b5f3d7ce7486de7199d15234ce46ead3d87decce77466cd2f28b9e085
+
+PKG_FLAGS:=nonshared
+
+include $(INCLUDE_DIR)/package.mk
+
+define Package/brcm27xx-armstub
+  SECTION:=boot
+  CATEGORY:=Boot Loaders
+  TITLE:=brcm27xx-armstub
+  DEPENDS:=@TARGET_brcm2708
+endef
+
+define Package/brcm27xx-armstub/description
+  ARM stubs for brcm27xx.
+endef
+
+MAKE_PATH = armstubs
+
+MAKE_FLAGS += \
+	CC8=$(TARGET_CC) \
+	LD8=$(TARGET_CROSS)ld \
+	OBJCOPY8=$(TARGET_CROSS)objcopy \
+	OBJDUMP8=$(TARGET_CROSS)objdump
+
+define Build/Compile
+	$(call Build/Compile/Default,armstub8-gic.elf armstub8-gic.bin)
+endef
+
+define Build/InstallDev
+	$(CP) $(PKG_BUILD_DIR)/armstubs/armstub8-gic.bin $(KERNEL_BUILD_DIR)
+endef
+
+define Package/brcm27xx-armstub/install
+	true
+endef
+
+$(eval $(call BuildPackage,brcm27xx-armstub))