diff --git a/make/config.amd64.mk b/make/config.amd64.mk
index df31cd5d..6bf10fae 100644
--- a/make/config.amd64.mk
+++ b/make/config.amd64.mk
@@ -5,6 +5,8 @@
 ############################################################
 include $(ONL)/make/config.mk
 export TOOLCHAIN := x86_64-linux-gnu
+export CROSS_COMPILER := $(TOOLCHAIN)-
 export ARCH := amd64
 export UARCH := AMD64
+export ARCH_BOOT := grub
 export __$(ARCH)__ := 1
diff --git a/make/config.arm64.mk b/make/config.arm64.mk
index 27587349..a64eec6a 100644
--- a/make/config.arm64.mk
+++ b/make/config.arm64.mk
@@ -5,6 +5,8 @@
 ############################################################
 include $(ONL)/make/config.mk
 export TOOLCHAIN := aarch64-linux-gnu
+export CROSS_COMPILER := $(TOOLCHAIN)-
 export ARCH := arm64
 export UARCH := ARM64
+export ARCH_BOOT := uboot
 export __$(ARCH)__ := 1
diff --git a/make/config.armel.mk b/make/config.armel.mk
index fe6b8c4c..cf70bcb7 100644
--- a/make/config.armel.mk
+++ b/make/config.armel.mk
@@ -5,6 +5,8 @@
 ############################################################
 include $(ONL)/make/config.mk
 export TOOLCHAIN := arm-linux-gnueabi
+export CROSS_COMPILER := $(TOOLCHAIN)-
 export ARCH := armel
 export UARCH := ARMEL
+export ARCH_BOOT := uboot
 export __$(ARCH)__ := 1
diff --git a/make/config.powerpc.mk b/make/config.powerpc.mk
index e8aba400..a72663a3 100644
--- a/make/config.powerpc.mk
+++ b/make/config.powerpc.mk
@@ -5,6 +5,8 @@
 ############################################################
 include $(ONL)/make/config.mk
 export TOOLCHAIN := powerpc-linux-gnu
+export CROSS_COMPILER := $(TOOLCHAIN)-
 export ARCH := powerpc
 export UARCH := PPC
+export ARCH_BOOT := uboot
 export __$(ARCH)__ := 1