add nds32 bare-metal toolchain support

target/arch.lst

@@ -16,6 +16,7 @@ metag
 microblaze
 mips
 mips64
+nds32
 nios2
 or1k
 ppc

target/config/Config.in.cpu

@@ -844,6 +844,11 @@ config ADK_CPU_MICROBLAZE
 	select ADK_TARGET_WITH_MMU if !ADK_LINUX_UCLINUX
 	select ADK_TARGET_WITH_NPTL if ADK_TARGET_LIB_GLIBC || ADK_TARGET_LIB_MUSL
 
+config ADK_CPU_NDS32
+	bool
+	select ADK_TARGET_WITH_NPTL
+	select ADK_TARGET_WITH_MMU
+
 config ADK_CPU_NIOS2
 	bool
 	select ADK_TARGET_WITH_LT if ADK_TARGET_LIB_UCLIBC_NG
@@ -1377,6 +1382,8 @@ config ADK_TARGET_CPU_ARCH
 	default "mips64el" if ADK_TARGET_ARCH_MIPS64 && ADK_TARGET_LITTLE_ENDIAN
 	default "mips" if ADK_TARGET_ARCH_MIPS && ADK_TARGET_BIG_ENDIAN
 	default "mipsel" if ADK_TARGET_ARCH_MIPS && ADK_TARGET_LITTLE_ENDIAN
+	default "nds32le" if ADK_TARGET_ARCH_NDS32 && ADK_TARGET_LITTLE_ENDIAN
+	default "nds32be" if ADK_TARGET_ARCH_NDS32 && ADK_TARGET_BIG_ENDIAN
 	default "nios2" if ADK_TARGET_ARCH_NIOS2
 	default "or1k" if ADK_TARGET_ARCH_OR1K
 	default "ppc" if ADK_TARGET_ARCH_PPC

target/config/Config.in.endian

@@ -10,6 +10,7 @@ depends on ADK_TARGET_ARCH_ARC \
 	|| ADK_TARGET_ARCH_MICROBLAZE \
 	|| ADK_TARGET_ARCH_MIPS \
 	|| ADK_TARGET_ARCH_MIPS64 \
+	|| ADK_TARGET_ARCH_NDS32 \
 	|| ADK_TARGET_ARCH_PPC64 \
 	|| ADK_TARGET_ARCH_SH \
 	|| ADK_TARGET_ARCH_XTENSA

target/config/Config.in.libc

@@ -8,6 +8,7 @@ config ADK_TARGET_LIB_UCLIBC_NG
 	bool "uClibc-ng embedded C library"
 	depends on \
 		   !ADK_TARGET_ARCH_AARCH64 && \
+		   !ADK_TARGET_ARCH_NDS32 && \
 		   !ADK_TARGET_ARCH_S390 && \
 		   !ADK_TARGET_ARCH_SPARC64 && \
 		   !ADK_TARGET_ARCH_PPC64 && \
@@ -39,6 +40,7 @@ config ADK_TARGET_LIB_GLIBC
 	depends on !ADK_TARGET_ARCH_BFIN
 	depends on !ADK_TARGET_ARCH_CRIS
 	depends on !ADK_TARGET_ARCH_H8300
+	depends on !ADK_TARGET_ARCH_NDS32
 	depends on !ADK_TARGET_ARCH_XTENSA
 	depends on !ADK_TARGET_UCLINUX
 	depends on !ADK_TARGET_WITHOUT_MMU
@@ -57,6 +59,7 @@ config ADK_TARGET_LIB_NEWLIB
 		ADK_TARGET_ARCH_LM32 || \
 		ADK_TARGET_ARCH_MICROBLAZE || \
 		ADK_TARGET_ARCH_MIPS || \
+		ADK_TARGET_ARCH_NDS32 || \
 		ADK_TARGET_ARCH_OR1K || \
 		ADK_TARGET_ARCH_PPC || \
 		ADK_TARGET_ARCH_SPARC || \

target/nds32/Makefile

@@ -0,0 +1,56 @@
+# This file is part of the OpenADK project. OpenADK is copyrighted
+# material, please see the LICENCE file in the top-level directory.
+
+include $(ADK_TOPDIR)/rules.mk
+include $(ADK_TOPDIR)/mk/kernel-build.mk
+include $(ADK_TOPDIR)/mk/image.mk
+
+KERNEL:=$(LINUX_DIR)/$(ADK_TARGET_KERNEL)
+
+# target helper text
+ifeq ($(ADK_TARGET_FS),archive)
+targethelp:
+	@echo "The RootFS tarball is: $(FW_DIR)/$(ROOTFSTARBALL)"
+endif
+ifeq ($(ADK_TARGET_FS),initramfs)
+targethelp:
+	@echo 'The kernel file is: $(FW_DIR)/${TARGET_KERNEL}'
+	@echo 'The initramfs image is: ${FW_DIR}/${INITRAMFS}'
+endif
+ifeq ($(ADK_TARGET_FS),initramfsarchive)
+targethelp:
+	@echo 'The kernel file is: $(FW_DIR)/${TARGET_KERNEL}'
+	@echo "The RootFS tarball is: $(FW_DIR)/$(ROOTFSUSERTARBALL)"
+endif
+ifeq ($(ADK_TARGET_FS),initramfspiggyback)
+targethelp:
+	@echo 'The kernel+initramfs file is: $(FW_DIR)/${TARGET_KERNEL}'
+endif
+ifeq ($(ADK_TARGET_FS),nfsroot)
+targethelp:
+	@echo 'The kernel file is: $(FW_DIR)/${TARGET_KERNEL}'
+	@echo "The RootFS tarball is: $(FW_DIR)/$(ROOTFSUSERTARBALL)"
+endif
+
+kernel-strip:
+	@cp $(KERNEL) $(BUILD_DIR)/$(TARGET_KERNEL)
+
+kernel-install: kernel-strip
+	@cp $(BUILD_DIR)/$(TARGET_KERNEL) $(FW_DIR)/$(TARGET_KERNEL)
+
+# filesystem specific targets
+ifeq ($(ADK_TARGET_FS),archive)
+imageinstall: $(FW_DIR)/$(ROOTFSTARBALL) targethelp
+endif
+ifeq ($(ADK_TARGET_FS),initramfs)
+imageinstall: kernel-install $(FW_DIR)/$(INITRAMFS) targethelp
+endif
+ifeq ($(ADK_TARGET_FS),initramfsarchive)
+imageinstall: kernel-install $(FW_DIR)/$(ROOTFSUSERTARBALL) targethelp
+endif
+ifeq ($(ADK_TARGET_FS),initramfspiggyback)
+imageinstall: createinitramfs targethelp
+endif
+ifeq ($(ADK_TARGET_FS),nfsroot)
+imageinstall: kernel-install $(FW_DIR)/$(ROOTFSUSERTARBALL) targethelp
+endif

target/nds32/systems/toolchain-nds32

@@ -0,0 +1,8 @@
+config ADK_TARGET_SYSTEM_TOOLCHAIN_NDS32
+	bool "Toolchain only"
+	select ADK_CPU_NDS32
+	select ADK_TARGET_TOOLCHAIN
+	select ADK_TARGET_PACKAGE_TXZ
+	help
+	  NDS32 toolchain.
+

toolchain/Makefile

@@ -37,7 +37,7 @@ ELF2FLT:=elf2flt-install
 endif
 
 # disable gdb for some architectures
-ifeq ($(ADK_TARGET_ARCH_ARC)$(ADK_TARGET_ARCH_METAG)$(ADK_TARGET_ARCH_OR1K),)
+ifeq ($(ADK_TARGET_ARCH_ARC)$(ADK_TARGET_ARCH_NDS32)$(ADK_TARGET_ARCH_METAG)$(ADK_TARGET_ARCH_OR1K),)
 TARGETS+=gdb
 GDB:=gdb-install
 endif