diff --git a/Makefile b/Makefile
index 00639ae59535ee9cbebf08681878e654d471bbf8..9cac37a730fc0f7526eeb832b84fed7057c5cfa3 100644
--- a/Makefile
+++ b/Makefile
@@ -180,35 +180,32 @@ PREBUILT_QEMU       := $(PREBUILT_DIR)/qemu
 #QEMU_GIT ?= https://github.com/qemu/qemu.git
 QEMU_GIT  ?= https://gitee.com/mirrors/qemu.git
 _QEMU_GIT := $(QEMU_GIT)
-_QEMU_SRC ?= qemu
+_QEMU_SRC ?= $(if $(QEMU_FORK),$(call _lc,$(QEMU_FORK)-qemu),qemu)
 QEMU_SRC  ?= $(_QEMU_SRC)
 
 #UBOOT_GIT ?= https://github.com/u-boot/u-boot.git
 UBOOT_GIT  ?= https://gitee.com/mirrors/u-boot.git
 _UBOOT_GIT := $(UBOOT_GIT)
-_UBOOT_SRC ?= u-boot
+_UBOOT_SRC ?= $(if $(UBOOT_FORK),$(call _lc,$(UBOOT_FORK)-uboot),u-boot)
 UBOOT_SRC  ?= $(_UBOOT_SRC)
 
+# could switch to other kernel fork for example openEuler
 #KERNEL_GIT ?= https://github.com/tinyclub/linux-stable.git
 #KERNEL_GIT ?= https://mirrors.tuna.tsinghua.edu.cn/git/linux-stable.git
 KERNEL_GIT  ?= https://kernel.source.codeaurora.cn/pub/scm/linux/kernel/git/stable/linux.git
 #KERNEL_GIT ?= git://git.kernel.org/pub/scm/linux/kernel/git/stable/linux-stable.git
 _KERNEL_GIT := $(KERNEL_GIT)
-_KERNEL_SRC ?= linux-stable
+_KERNEL_SRC ?= $(if $(KERNEL_FORK),$(call _lc,$(KERNEL_FORK)-kernel),linux-stable)
 KERNEL_SRC  ?= $(_KERNEL_SRC)
 
 # Use faster mirror instead of git://git.buildroot.net/buildroot.git
 #ROOT_GIT ?= https://github.com/buildroot/buildroot
 ROOT_GIT  ?= https://gitee.com/mirrors/buildroot.git
 _ROOT_GIT := $(ROOT_GIT)
-_ROOT_SRC ?= buildroot
+_ROOT_SRC ?= $(if $(ROOT_FORK),$(call _lc,$(ROOT_FORK)-buildroot),buildroot)
 ROOT_SRC  ?= $(_ROOT_SRC)
 
-_LINUX=$(LINUX)
-KERNEL_ABS_SRC := $(TOP_SRC)/$(KERNEL_SRC)
-ROOT_ABS_SRC   := $(TOP_SRC)/$(ROOT_SRC)
-UBOOT_ABS_SRC  := $(TOP_SRC)/$(UBOOT_SRC)
-QEMU_ABS_SRC   := $(TOP_SRC)/$(QEMU_SRC)
+_LINUX = $(LINUX)
 
 BOARD_MAKEFILE := $(BOARD_DIR)/Makefile
 
@@ -233,7 +230,7 @@ $($(1)[$(2)_$($(2))$(if $($(3)),$(comma)$(3)_$($(3)))])
 endef
 
 define __v
-$(if $($(3)),$(if $(call ___v,$1,$2,$3),$(call ___v,$1,$2,$3),$(call ___v,$1,$2)),$(call ___v,$1,$2))
+$(if $($(3)),$(if $(call ___v,$1,$2,$3),$(call ___v,$1,$2,$3),$(if $(call ___v,$1,$2),$(call ___v,$1,$2),$(call ___v,$1,$3))),$(call ___v,$1,$2))
 endef
 
 define _v
@@ -329,6 +326,12 @@ ifneq ($(BOARD),)
   # include $(BOARD_DIR)/.labinit
   $(eval $(call _bi,labinit))
   $(eval $(call _bi,labconfig))
+
+  _QEMU_FORK := $(if $(QEMU_FORK),$(call _lc,$(QEMU_FORK))/,)
+  _UBOOT_FORK := $(if $(UBOOT_FORK),$(call _lc,$(UBOOT_FORK))/,)
+  _KERNEL_FORK := $(if $(KERNEL_FORK),$(call _lc,$(KERNEL_FORK))/,)
+  _ROOT_FORK := $(if $(ROOT_FORK),$(call _lc,$(ROOT_FORK))/,)
+
   ifeq ($(BOARD_MAKEFILE), $(wildcard $(BOARD_MAKEFILE)))
     include $(BOARD_MAKEFILE)
   endif
@@ -337,8 +340,20 @@ ifneq ($(BOARD),)
 endif
 
 # Customize kernel git repo and local dir
-$(eval $(call __vs,KERNEL_SRC,LINUX))
-$(eval $(call __vs,KERNEL_GIT,LINUX))
+$(eval $(call __vs,KERNEL_SRC,LINUX,KERNEL_FORK))
+$(eval $(call __vs,KERNEL_GIT,LINUX,KERNEL_FORK))
+$(eval $(call __vs,ROOT_SRC,BUILDROOT,ROOT_FORK))
+$(eval $(call __vs,ROOT_GIT,BUILDROOT,ROOT_FORK))
+$(eval $(call __vs,UBOOT_SRC,UBOOT,UBOOT_FORK))
+$(eval $(call __vs,UBOOT_GIT,UBOOT,UBOOT_FORK))
+$(eval $(call __vs,QEMU_SRC,QEMU,QEMU_FORK))
+$(eval $(call __vs,QEMU_GIT,QEMU,QEMU_FORK))
+
+# Allow boards to customize source and repos
+KERNEL_ABS_SRC := $(TOP_SRC)/$(KERNEL_SRC)
+ROOT_ABS_SRC   := $(TOP_SRC)/$(ROOT_SRC)
+UBOOT_ABS_SRC  := $(TOP_SRC)/$(UBOOT_SRC)
+QEMU_ABS_SRC   := $(TOP_SRC)/$(QEMU_SRC)
 
 $(eval $(call __vs,DTS,LINUX))
 $(eval $(call __vs,DTB,LINUX))
@@ -662,10 +677,10 @@ _QTOOL  := $(QTOOL)
 # Core build: for building in standalone directories
 TOP_BUILD      := $(TOP_DIR)/build
 TOP_BUILD_ARCH := $(TOP_BUILD)/$(XARCH)
-QEMU_BUILD     := $(TOP_BUILD_ARCH)/qemu-$(QEMU)-$(MACH)
-UBOOT_BUILD    := $(TOP_BUILD_ARCH)/uboot-$(UBOOT)-$(MACH)
-KERNEL_BUILD   := $(TOP_BUILD_ARCH)/linux-$(LINUX)-$(MACH)
-ROOT_BUILD     := $(TOP_BUILD_ARCH)/buildroot-$(BUILDROOT)-$(MACH)
+QEMU_BUILD     := $(TOP_BUILD_ARCH)/$(_QEMU_FORK)qemu-$(QEMU)-$(MACH)
+UBOOT_BUILD    := $(TOP_BUILD_ARCH)/$(_UBOOT_FORK)uboot-$(UBOOT)-$(MACH)
+KERNEL_BUILD   := $(TOP_BUILD_ARCH)/$(_KERNEL_FORK)linux-$(LINUX)-$(MACH)
+ROOT_BUILD     := $(TOP_BUILD_ARCH)/$(_ROOT_FORK)buildroot-$(BUILDROOT)-$(MACH)
 BSP_BUILD      := $(TOP_BUILD_ARCH)/bsp-$(MACH)
 
 # Cross Compiler toolchains
@@ -901,13 +916,13 @@ endif
 
 # Prebuilt path (not top dir) setting
 ifneq ($(_BIMAGE),)
-  PREBUILT_UBOOT_DIR  ?= $(dir $(_BIMAGE))
+  PREBUILT_UBOOT_DIR  ?= $(subst //,,$(dir $(_BIMAGE))/)
 endif
 ifneq ($(_KIMAGE),)
-  PREBUILT_KERNEL_DIR ?= $(dir $(_KIMAGE))
+  PREBUILT_KERNEL_DIR ?= $(subst //,,$(dir $(_KIMAGE))/)
 endif
 ifneq ($(_ROOTFS),)
-  PREBUILT_ROOT_DIR   ?= $(dir $(_ROOTFS))
+  PREBUILT_ROOT_DIR   ?= $(subst //,,$(dir $(_ROOTFS))/)
 endif
 ifneq ($(_QTOOL),)
   PREBUILT_QEMU_DIR   ?= $(patsubst %/bin/,%,$(dir $(_QTOOL)))
@@ -1434,7 +1449,7 @@ $$(call _stamp_$(1),source): $$(call _stamp_$(1),outdir)
 	@echo
 	$$(Q)if [ -e $$($(call _uc,$(1))_SRC_FULL)/.git ]; then \
 		[ -d $$($(call _uc,$(1))_SRC_FULL) ] && cd $$($(call _uc,$(1))_SRC_FULL);	\
-		if [ $$(shell [ -d $$($(call _uc,$(1))_SRC_FULL) ] && cd $$($(call _uc,$(1))_SRC_FULL) && git show --pretty=oneline -q $(or $$(__$(call _uc,$(2))),$$(_$(call _uc,$(2)))) >/dev/null 2>&1; echo $$$$?) -ne 0 ]; then \
+		if [ $$(shell [ -d $$($(call _uc,$(1))_SRC_FULL) ] && cd $$($(call _uc,$(1))_SRC_FULL) && git show --pretty=oneline -q $$(or $$(__$(call _uc,$(2))),$$(_$(call _uc,$(2)))) >/dev/null 2>&1; echo $$$$?) -ne 0 ]; then \
 			$$($(call _uc,$(1))_GITADD); \
 			git fetch --tags $$(or $$($(call _uc,$(1))_GITREPO),origin) && touch $$@; \
 		fi;	\
@@ -1560,7 +1575,7 @@ __stamp_$(1)=$$(_stamp_$(1))
 endif
 endif
 
-$(call _uc,$1)_CONFIG_FILE ?= $(2)_$$($(call _uc,$(2)))_defconfig
+$(call _uc,$1)_CONFIG_FILE ?= $$(_$(call _uc,$(1))_FORK)$(2)_$$($(call _uc,$(2)))_defconfig
 $(3)CFG ?= $$($(call _uc,$1)_CONFIG_FILE)
 
 ifeq ($$($(3)CFG),$$($(call _uc,$1)_CONFIG_FILE))
diff --git a/boards/aarch64/virt/Makefile b/boards/aarch64/virt/Makefile
index 7cb9420f639636f3fdb082fd11c3a8a2cb07ab90..4da3022d63f86342901f2a80278b3fae32dbb2ff 100644
--- a/boards/aarch64/virt/Makefile
+++ b/boards/aarch64/virt/Makefile
@@ -19,6 +19,9 @@ CCORI[UBOOT_v2019.10,OS_focal]  = internal
 LINUX   ?= v5.1
 BUILDROOT?= 2019.11.1
 
+# git repos for other kernel fork
+KERNEL_GIT[KERNEL_FORK_openeuler] := https://gitee.com/openeuler/kernel.git
+
 NETDEV_LIST := virtio
 
 NETDEV  ?= virtio
@@ -47,7 +50,7 @@ ROOTDEV ?= /dev/vda
 
 FSTYPE  ?= ext2
 ORIIMG  ?= arch/$(ARCH)/boot/Image
-KIMAGE  ?= $(BSP_KERNEL)/$(LINUX)/Image
+KIMAGE  ?= $(BSP_KERNEL)/$(_KERNEL_FORK)$(LINUX)/Image
 
 # Get DRAM start & size via `bdinfo`
 KRN_ADDR?= 0x45000000
@@ -78,6 +81,10 @@ endif
 # Run uboot as bios, use -bios instead of -kernel
 UBOOT_BIOS ?= 1
 
+BSP_ROOT := $(BSP_DIR)/root/$(_ROOT_FORK)
+BSP_KERNEL := $(BSP_DIR)/kernel/$(_KERNEL_FORK)
+BSP_UBOOT := $(BSP_DIR)/uboot/$(_UBOOT_FORK)
+BSP_QEMU := $(BSP_DIR)/qemu/$(_QEMU_FORK)
 BIMAGE  ?= $(BSP_UBOOT)/$(UBOOT)/$(LINUX)/u-boot.bin
 DTS     ?= $(BSP_KERNEL)/$(LINUX)/virt-gicv3.dts
 # DTB is loaded by QEMU automatically at start of RAM, we load a new one for easier customization
diff --git a/boards/aarch64/virt/bsp b/boards/aarch64/virt/bsp
index b2d22ae4079162cf8200e71a10170b98843a91af..d6c0ff98a5b86c3eece2da2a767305baaf06759d 160000
--- a/boards/aarch64/virt/bsp
+++ b/boards/aarch64/virt/bsp
@@ -1 +1 @@
-Subproject commit b2d22ae4079162cf8200e71a10170b98843a91af
+Subproject commit d6c0ff98a5b86c3eece2da2a767305baaf06759d
diff --git a/boards/x86_64/pc/Makefile b/boards/x86_64/pc/Makefile
index 2f568bf047ec7d714c321d1495023a30cb0cd91d..cd1f1376ec3d4d2a5c5c5222d83bd2acd4525d6a 100644
--- a/boards/x86_64/pc/Makefile
+++ b/boards/x86_64/pc/Makefile
@@ -9,6 +9,9 @@ MEM     ?= 128M
 SMP     ?= 4
 LINUX   ?= v5.1
 
+# git repos for other kernel fork
+KERNEL_GIT[KERNEL_FORK_openeuler] := https://gitee.com/openeuler/kernel.git
+
 GCC = 9
 GCC[LINUX_v3.2] = 4.8
 GCC[LINUX_v2.6.12.6] = 4.8
@@ -36,6 +39,8 @@ ROOTDEV_LIST := /dev/hda /dev/ram0 /dev/nfs
 ROOTDEV_LIST[LINUX_v3.2] := /dev/sda /dev/ram0 /dev/nfs
 ROOTDEV ?= /dev/ram0
 
+BSP_ROOT := $(BSP_DIR)/root/$(_ROOT_FORK)
+BSP_KERNEL := $(BSP_DIR)/kernel/$(_KERNEL_FORK)
 KIMAGE  ?= $(BSP_KERNEL)/$(LINUX)/bzImage
 ROOTFS  ?= $(BSP_ROOT)/$(BUILDROOT)/rootfs.cpio.gz
 ROOTFS[LINUX_v2.6.12.6]  ?= $(BSP_ROOT)/$(BUILDROOT)/rootfs32.cpio.gz
diff --git a/boards/x86_64/pc/bsp b/boards/x86_64/pc/bsp
index a1c040c22c655b469a5a49c5533485d1d28f29bf..0078bd0a6b85cfa958f66e226bb248b43c842997 160000
--- a/boards/x86_64/pc/bsp
+++ b/boards/x86_64/pc/bsp
@@ -1 +1 @@
-Subproject commit a1c040c22c655b469a5a49c5533485d1d28f29bf
+Subproject commit 0078bd0a6b85cfa958f66e226bb248b43c842997
diff --git a/src/linux-stable b/src/linux-stable
index 92d21ac74a9e3c09b0b01c764e530657e4c85c49..e93c9c99a629c61837d5a7fc2120cd2b6c70dbdd 160000
--- a/src/linux-stable
+++ b/src/linux-stable
@@ -1 +1 @@
-Subproject commit 92d21ac74a9e3c09b0b01c764e530657e4c85c49
+Subproject commit e93c9c99a629c61837d5a7fc2120cd2b6c70dbdd