arch/mips/Makefile - linux - Git at Google

 #
 # This file is subject to the terms and conditions of the GNU General Public
 # License.  See the file "COPYING" in the main directory of this archive
 # for more details.
 #
 # Copyright (C) 1994, 95, 96, 2003 by Ralf Baechle
 # DECStation modifications by Paul M. Antoine, 1996
 # Copyright (C) 2002, 2003, 2004  Maciej W. Rozycki
 #
 # This file is included by the global makefile so that you can add your own
 # architecture-specific flags and dependencies. Remember to do have actions
 # for "archclean" cleaning up for this architecture.
 #

 archscripts: scripts_basic
 	$(Q)$(MAKE) $(build)=arch/mips/tools elf-entry
 ifeq ($(CONFIG_CPU_LOONGSON3_WORKAROUNDS),y)
 	$(Q)$(MAKE) $(build)=arch/mips/tools loongson3-llsc-check
 endif
 	$(Q)$(MAKE) $(build)=arch/mips/boot/tools relocs

 KBUILD_DEFCONFIG := 32r2el_defconfig
 KBUILD_DTBS      := dtbs

 #
 # Select the object file format to substitute into the linker script.
 #
 ifdef CONFIG_CPU_LITTLE_ENDIAN
 32bit-tool-archpref	= mipsel
 64bit-tool-archpref	= mips64el
 32bit-bfd		= elf32-tradlittlemips
 64bit-bfd		= elf64-tradlittlemips
 32bit-emul		= elf32ltsmip
 64bit-emul		= elf64ltsmip
 else
 32bit-tool-archpref	= mips
 64bit-tool-archpref	= mips64
 32bit-bfd		= elf32-tradbigmips
 64bit-bfd		= elf64-tradbigmips
 32bit-emul		= elf32btsmip
 64bit-emul		= elf64btsmip
 endif

 ifdef CONFIG_32BIT
 tool-archpref		= $(32bit-tool-archpref)
 UTS_MACHINE		:= mips
 endif
 ifdef CONFIG_64BIT
 tool-archpref		= $(64bit-tool-archpref)
 UTS_MACHINE		:= mips64
 endif

 ifneq ($(SUBARCH),$(ARCH))
   ifeq ($(CROSS_COMPILE),)
     CROSS_COMPILE := $(call cc-cross-prefix, $(tool-archpref)-linux-  $(tool-archpref)-linux-gnu-  $(tool-archpref)-unknown-linux-gnu-)
   endif
 endif

 ifdef CONFIG_FUNCTION_GRAPH_TRACER
   ifndef KBUILD_MCOUNT_RA_ADDRESS
     ifeq ($(call cc-option-yn,-mmcount-ra-address), y)
       cflags-y += -mmcount-ra-address -DKBUILD_MCOUNT_RA_ADDRESS
     endif
   endif
 endif
 cflags-y += $(call cc-option, -mno-check-zero-division)

 ifdef CONFIG_32BIT
 ld-emul			= $(32bit-emul)
 vmlinux-32		= vmlinux
 vmlinux-64		= vmlinux.64

 cflags-y		+= -mabi=32
 endif

 ifdef CONFIG_64BIT
 ld-emul			= $(64bit-emul)
 vmlinux-32		= vmlinux.32
 vmlinux-64		= vmlinux

 cflags-y		+= -mabi=64
 endif

 all-$(CONFIG_BOOT_ELF32)	:= $(vmlinux-32)
 all-$(CONFIG_BOOT_ELF64)	:= $(vmlinux-64)
 all-$(CONFIG_SYS_SUPPORTS_ZBOOT)+= vmlinuz

 #
 # GCC uses -G 0 -mabicalls -fpic as default.  We don't want PIC in the kernel
 # code since it only slows down the whole thing.  At some point we might make
 # use of global pointer optimizations but their use of $28 conflicts with
 # the current pointer optimization.
 #
 # The DECStation requires an ECOFF kernel for remote booting, other MIPS
 # machines may also.  Since BFD is incredibly buggy with respect to
 # crossformat linking we rely on the elf2ecoff tool for format conversion.
 #
 cflags-y			+= -G 0 -mno-abicalls -fno-pic -pipe
 cflags-y			+= -msoft-float
 LDFLAGS_vmlinux			+= -G 0 -static -n -nostdlib
 KBUILD_AFLAGS_MODULE		+= -mlong-calls
 KBUILD_CFLAGS_MODULE		+= -mlong-calls

 ifeq ($(CONFIG_RELOCATABLE),y)
 LDFLAGS_vmlinux			+= --emit-relocs
 endif

 #
 # pass -msoft-float to GAS if it supports it.  However on newer binutils
 # (specifically newer than 2.24.51.20140728) we then also need to explicitly
 # set ".set hardfloat" in all files which manipulate floating point registers.
 #
 ifneq ($(call as-option,-Wa$(comma)-msoft-float,),)
 	cflags-y		+= -DGAS_HAS_SET_HARDFLOAT -Wa,-msoft-float
 endif

 cflags-y += -ffreestanding

 cflags-$(CONFIG_CPU_BIG_ENDIAN)		+= -EB
 cflags-$(CONFIG_CPU_LITTLE_ENDIAN)	+= -EL

 cflags-$(CONFIG_SB1XXX_CORELIS)	+= $(call cc-option,-mno-sched-prolog) \
 				   -fno-omit-frame-pointer

 # Some distribution-specific toolchains might pass the -fstack-check
 # option during the build, which adds a simple stack-probe at the beginning
 # of every function.  This stack probe is to ensure that there is enough
 # stack space, else a SEGV is generated.  This is not desirable for MIPS
 # as kernel stacks are small, placed in unmapped virtual memory, and do not
 # grow when overflowed.  Especially on SGI IP27 platforms, this check will
 # lead to a NULL pointer dereference in _raw_spin_lock_irq.
 #
 # In disassembly, this stack probe appears at the top of a function as:
 #    sd		zero,<offset>(sp)
 # Where <offset> is a negative value.
 #
 cflags-y += -fno-stack-check

 #
 # CPU-dependent compiler/assembler options for optimization.
 #
 cflags-$(CONFIG_CPU_R3000)	+= -march=r3000
 cflags-$(CONFIG_CPU_TX39XX)	+= -march=r3900
 cflags-$(CONFIG_CPU_VR41XX)	+= -march=r4100 -Wa,--trap
 cflags-$(CONFIG_CPU_R4X00)	+= -march=r4600 -Wa,--trap
 cflags-$(CONFIG_CPU_TX49XX)	+= -march=r4600 -Wa,--trap
 cflags-$(CONFIG_CPU_MIPS32_R1)	+= -march=mips32 -Wa,--trap
 cflags-$(CONFIG_CPU_MIPS32_R2)	+= -march=mips32r2 -Wa,--trap
 cflags-$(CONFIG_CPU_MIPS32_R5)	+= -march=mips32r5 -Wa,--trap -modd-spreg
 cflags-$(CONFIG_CPU_MIPS32_R6)	+= -march=mips32r6 -Wa,--trap -modd-spreg
 cflags-$(CONFIG_CPU_MIPS64_R1)	+= -march=mips64 -Wa,--trap
 cflags-$(CONFIG_CPU_MIPS64_R2)	+= -march=mips64r2 -Wa,--trap
 cflags-$(CONFIG_CPU_MIPS64_R5)	+= -march=mips64r5 -Wa,--trap
 cflags-$(CONFIG_CPU_MIPS64_R6)	+= -march=mips64r6 -Wa,--trap
 cflags-$(CONFIG_CPU_P5600)	+= -march=p5600 -Wa,--trap -modd-spreg
 cflags-$(CONFIG_CPU_R5000)	+= -march=r5000 -Wa,--trap
 cflags-$(CONFIG_CPU_R5500)	+= $(call cc-option,-march=r5500,-march=r5000) \
 			-Wa,--trap
 cflags-$(CONFIG_CPU_NEVADA)	+= $(call cc-option,-march=rm5200,-march=r5000) \
 			-Wa,--trap
 cflags-$(CONFIG_CPU_RM7000)	+= $(call cc-option,-march=rm7000,-march=r5000) \
 			-Wa,--trap
 cflags-$(CONFIG_CPU_SB1)	+= $(call cc-option,-march=sb1,-march=r5000) \
 			-Wa,--trap
 cflags-$(CONFIG_CPU_SB1)	+= $(call cc-option,-mno-mdmx)
 cflags-$(CONFIG_CPU_SB1)	+= $(call cc-option,-mno-mips3d)
 cflags-$(CONFIG_CPU_R10000)	+= $(call cc-option,-march=r10000,-march=r8000) \
 			-Wa,--trap
 cflags-$(CONFIG_CPU_CAVIUM_OCTEON) += $(call cc-option,-march=octeon) -Wa,--trap
 ifeq (,$(findstring march=octeon, $(cflags-$(CONFIG_CPU_CAVIUM_OCTEON))))
 cflags-$(CONFIG_CPU_CAVIUM_OCTEON) += -Wa,-march=octeon
 endif
 cflags-$(CONFIG_CAVIUM_CN63XXP1) += -Wa,-mfix-cn63xxp1
 cflags-$(CONFIG_CPU_BMIPS)	+= -march=mips32 -Wa,-mips32 -Wa,--trap

 cflags-$(CONFIG_CPU_R4000_WORKAROUNDS)	+= $(call cc-option,-mfix-r4000,)
 cflags-$(CONFIG_CPU_R4400_WORKAROUNDS)	+= $(call cc-option,-mfix-r4400,)
 cflags-$(CONFIG_CPU_DADDI_WORKAROUNDS)	+= $(call cc-option,-mno-daddi,)

 # For smartmips configurations, there are hundreds of warnings due to ISA overrides
 # in assembly and header files. smartmips is only supported for MIPS32r1 onwards
 # and there is no support for 64-bit. Various '.set mips2' or '.set mips3' or
 # similar directives in the kernel will spam the build logs with the following warnings:
 # Warning: the `smartmips' extension requires MIPS32 revision 1 or greater
 # or
 # Warning: the 64-bit MIPS architecture does not support the `smartmips' extension
 # Pass -Wa,--no-warn to disable all assembler warnings until the kernel code has
 # been fixed properly.
 mips-cflags				:= $(cflags-y)
 ifeq ($(CONFIG_CPU_HAS_SMARTMIPS),y)
 smartmips-ase				:= $(call cc-option-yn,$(mips-cflags) -msmartmips)
 cflags-$(smartmips-ase)			+= -msmartmips -Wa,--no-warn
 endif
 ifeq ($(CONFIG_CPU_MICROMIPS),y)
 micromips-ase				:= $(call cc-option-yn,$(mips-cflags) -mmicromips)
 cflags-$(micromips-ase)			+= -mmicromips
 endif
 ifeq ($(CONFIG_CPU_HAS_MSA),y)
 toolchain-msa				:= $(call cc-option-yn,$(mips-cflags) -mhard-float -mfp64 -Wa$(comma)-mmsa)
 cflags-$(toolchain-msa)			+= -DTOOLCHAIN_SUPPORTS_MSA
 endif
 toolchain-virt				:= $(call cc-option-yn,$(mips-cflags) -mvirt)
 cflags-$(toolchain-virt)		+= -DTOOLCHAIN_SUPPORTS_VIRT
 # For -mmicromips, use -Wa,-fatal-warnings to catch unsupported -mxpa which
 # only warns
 xpa-cflags-y				:= $(mips-cflags)
 xpa-cflags-$(micromips-ase)		+= -mmicromips -Wa$(comma)-fatal-warnings
 toolchain-xpa				:= $(call cc-option-yn,$(xpa-cflags-y) -mxpa)
 cflags-$(toolchain-xpa)			+= -DTOOLCHAIN_SUPPORTS_XPA
 toolchain-crc				:= $(call cc-option-yn,$(mips-cflags) -Wa$(comma)-mcrc)
 cflags-$(toolchain-crc)			+= -DTOOLCHAIN_SUPPORTS_CRC
 toolchain-dsp				:= $(call cc-option-yn,$(mips-cflags) -Wa$(comma)-mdsp)
 cflags-$(toolchain-dsp)			+= -DTOOLCHAIN_SUPPORTS_DSP
 toolchain-ginv				:= $(call cc-option-yn,$(mips-cflags) -Wa$(comma)-mginv)
 cflags-$(toolchain-ginv)		+= -DTOOLCHAIN_SUPPORTS_GINV

 #
 # Firmware support
 #
 libs-$(CONFIG_FW_ARC)		+= arch/mips/fw/arc/
 libs-$(CONFIG_FW_CFE)		+= arch/mips/fw/cfe/
 libs-$(CONFIG_FW_SNIPROM)	+= arch/mips/fw/sni/
 libs-y				+= arch/mips/fw/lib/

 #
 # Kernel compression
 #
 ifdef CONFIG_SYS_SUPPORTS_ZBOOT
 COMPRESSION_FNAME		= vmlinuz
 else
 COMPRESSION_FNAME		= vmlinux
 endif

 #
 # Board-dependent options and extra files
 #
 include arch/mips/Kbuild.platforms

 ifdef CONFIG_PHYSICAL_START
 load-y					= $(CONFIG_PHYSICAL_START)
 endif

 entry-y				= $(shell $(objtree)/arch/mips/tools/elf-entry vmlinux)
 cflags-y			+= -I$(srctree)/arch/mips/include/asm/mach-generic
 drivers-$(CONFIG_PCI)		+= arch/mips/pci/

 #
 # Automatically detect the build format. By default we choose
 # the elf format according to the load address.
 # We can always force a build with a 64-bits symbol format by
 # passing 'KBUILD_SYM32=no' option to the make's command line.
 #
 ifdef CONFIG_64BIT
   ifndef KBUILD_SYM32
     ifeq ($(shell expr $(load-y) \< 0xffffffff80000000), 0)
       KBUILD_SYM32 = y
     endif
   endif

   ifeq ($(KBUILD_SYM32)$(call cc-option-yn,-msym32), yy)
     cflags-y += -msym32 -DKBUILD_64BIT_SYM32
   else
     ifeq ($(CONFIG_CPU_DADDI_WORKAROUNDS), y)
       $(error CONFIG_CPU_DADDI_WORKAROUNDS unsupported without -msym32)
     endif
   endif
 endif

 # When linking a 32-bit executable the LLVM linker cannot cope with a
 # 32-bit load address that has been sign-extended to 64 bits.  Simply
 # remove the upper 32 bits then, as it is safe to do so with other
 # linkers.
 ifdef CONFIG_64BIT
 	load-ld			= $(load-y)
 else
 	load-ld			= $(subst 0xffffffff,0x,$(load-y))
 endif

 KBUILD_AFLAGS	+= $(cflags-y)
 KBUILD_CFLAGS	+= $(cflags-y)
 KBUILD_CPPFLAGS += -DVMLINUX_LOAD_ADDRESS=$(load-y) -DLINKER_LOAD_ADDRESS=$(load-ld)
 KBUILD_CPPFLAGS += -DDATAOFFSET=$(if $(dataoffset-y),$(dataoffset-y),0)

 bootvars-y	= VMLINUX_LOAD_ADDRESS=$(load-y) \
 		  LINKER_LOAD_ADDRESS=$(load-ld) \
 		  VMLINUX_ENTRY_ADDRESS=$(entry-y) \
 		  PLATFORM="$(platform-y)" \
 		  ITS_INPUTS="$(its-y)"
 ifdef CONFIG_32BIT
 bootvars-y	+= ADDR_BITS=32
 endif
 ifdef CONFIG_64BIT
 bootvars-y	+= ADDR_BITS=64
 endif

 # This is required to get dwarf unwinding tables into .debug_frame
 # instead of .eh_frame so we don't discard them.
 KBUILD_CFLAGS += -fno-asynchronous-unwind-tables

 KBUILD_LDFLAGS		+= -m $(ld-emul)

 ifdef CONFIG_MIPS
 CHECKFLAGS += $(shell $(CC) $(KBUILD_CFLAGS) -dM -E -x c /dev/null | \
 	egrep -vw '__GNUC_(|MINOR_|PATCHLEVEL_)_' | \
 	sed -e "s/^\#define /-D'/" -e "s/ /'='/" -e "s/$$/'/" -e 's/\$$/&&/g')
 endif

 OBJCOPYFLAGS		+= --remove-section=.reginfo

 head-y := arch/mips/kernel/head.o

 libs-y			+= arch/mips/lib/
 libs-$(CONFIG_MIPS_FP_SUPPORT) += arch/mips/math-emu/

 # See arch/mips/Kbuild for content of core part of the kernel
 core-y += arch/mips/

 drivers-y			+= arch/mips/crypto/
 drivers-$(CONFIG_OPROFILE)	+= arch/mips/oprofile/

 # suspend and hibernation support
 drivers-$(CONFIG_PM)	+= arch/mips/power/

 # boot image targets (arch/mips/boot/)
 boot-y			:= vmlinux.bin
 boot-y			+= vmlinux.ecoff
 boot-y			+= vmlinux.srec
 ifeq ($(shell expr $(load-y) \< 0xffffffff80000000 2> /dev/null), 0)
 boot-y			+= uImage
 boot-y			+= uImage.bin
 boot-y			+= uImage.bz2
 boot-y			+= uImage.gz
 boot-y			+= uImage.lzma
 boot-y			+= uImage.lzo
 endif
 boot-y			+= vmlinux.itb
 boot-y			+= vmlinux.gz.itb
 boot-y			+= vmlinux.bz2.itb
 boot-y			+= vmlinux.lzma.itb
 boot-y			+= vmlinux.lzo.itb

 # compressed boot image targets (arch/mips/boot/compressed/)
 bootz-y			:= vmlinuz
 bootz-y			+= vmlinuz.bin
 bootz-y			+= vmlinuz.ecoff
 bootz-y			+= vmlinuz.srec
 ifeq ($(shell expr $(zload-y) \< 0xffffffff80000000 2> /dev/null), 0)
 bootz-y			+= uzImage.bin
 endif
 bootz-y			+= vmlinuz.itb

 #
 # Some machines like the Indy need 32-bit ELF binaries for booting purposes.
 # Other need ECOFF, so we build a 32-bit ELF binary for them which we then
 # convert to ECOFF using elf2ecoff.
 #
 quiet_cmd_32 = OBJCOPY $@
 	cmd_32 = $(OBJCOPY) -O $(32bit-bfd) $(OBJCOPYFLAGS) $< $@
 vmlinux.32: vmlinux
 	$(call cmd,32)

 #
 # The 64-bit ELF tools are pretty broken so at this time we generate 64-bit
 # ELF files from 32-bit files by conversion.
 #
 quiet_cmd_64 = OBJCOPY $@
 	cmd_64 = $(OBJCOPY) -O $(64bit-bfd) $(OBJCOPYFLAGS) $< $@
 vmlinux.64: vmlinux
 	$(call cmd,64)

 all:	$(all-y) $(KBUILD_DTBS)

 # boot
 $(boot-y): $(vmlinux-32) FORCE
 	$(Q)$(MAKE) $(build)=arch/mips/boot VMLINUX=$(vmlinux-32) \
 		$(bootvars-y) arch/mips/boot/$@

 ifdef CONFIG_SYS_SUPPORTS_ZBOOT
 # boot/compressed
 $(bootz-y): $(vmlinux-32) FORCE
 	$(Q)$(MAKE) $(build)=arch/mips/boot/compressed \
 		$(bootvars-y) 32bit-bfd=$(32bit-bfd) arch/mips/boot/$@
 else
 vmlinuz: FORCE
 	@echo '   CONFIG_SYS_SUPPORTS_ZBOOT is not enabled'
 	/bin/false
 endif


 CLEAN_FILES += vmlinux.32 vmlinux.64

 # device-trees
 core-y += arch/mips/boot/dts/

 archprepare:
 ifdef CONFIG_MIPS32_N32
 	@$(kecho) '  Checking missing-syscalls for N32'
 	$(Q)$(MAKE) $(build)=. missing-syscalls missing_syscalls_flags="-mabi=n32"
 endif
 ifdef CONFIG_MIPS32_O32
 	@$(kecho) '  Checking missing-syscalls for O32'
 	$(Q)$(MAKE) $(build)=. missing-syscalls missing_syscalls_flags="-mabi=32"
 endif

 install:
 	$(Q)install -D -m 755 vmlinux $(INSTALL_PATH)/vmlinux-$(KERNELRELEASE)
 ifdef CONFIG_SYS_SUPPORTS_ZBOOT
 	$(Q)install -D -m 755 vmlinuz $(INSTALL_PATH)/vmlinuz-$(KERNELRELEASE)
 endif
 	$(Q)install -D -m 644 .config $(INSTALL_PATH)/config-$(KERNELRELEASE)
 	$(Q)install -D -m 644 System.map $(INSTALL_PATH)/System.map-$(KERNELRELEASE)

 archclean:
 	$(Q)$(MAKE) $(clean)=arch/mips/boot
 	$(Q)$(MAKE) $(clean)=arch/mips/boot/compressed
 	$(Q)$(MAKE) $(clean)=arch/mips/boot/tools

 archheaders:
 	$(Q)$(MAKE) $(build)=arch/mips/kernel/syscalls all

 define archhelp
 	echo '  install              - install kernel into $(INSTALL_PATH)'
 	echo '  vmlinux.ecoff        - ECOFF boot image'
 	echo '  vmlinux.bin          - Raw binary boot image'
 	echo '  vmlinux.srec         - SREC boot image'
 	echo '  vmlinux.32           - 64-bit boot image wrapped in 32bits (IP22/IP32)'
 	echo '  vmlinuz              - Compressed boot(zboot) image'
 	echo '  vmlinuz.ecoff        - ECOFF zboot image'
 	echo '  vmlinuz.bin          - Raw binary zboot image'
 	echo '  vmlinuz.srec         - SREC zboot image'
 	echo '  uImage               - U-Boot image'
 	echo '  uImage.bin           - U-Boot image (uncompressed)'
 	echo '  uImage.bz2           - U-Boot image (bz2)'
 	echo '  uImage.gz            - U-Boot image (gzip)'
 	echo '  uImage.lzma          - U-Boot image (lzma)'
 	echo '  uImage.lzo           - U-Boot image (lzo)'
 	echo '  uzImage.bin          - U-Boot image (self-extracting)'
 	echo
 	echo '  These will be default as appropriate for a configured platform.'
 	echo
 	echo '  If you are targeting a system supported by generic kernels you may'
 	echo '  configure the kernel for a given architecture target like so:'
 	echo
 	echo '  {micro32,32,64}{r1,r2,r6}{el,}_defconfig <BOARDS="list of boards">'
 	echo
 	echo '  Where BOARDS is some subset of the following:'
 	for board in $(sort $(BOARDS)); do echo "    $${board}"; done
 	echo
 	echo '  Specifically the following generic default configurations are'
 	echo '  supported:'
 	echo
 	$(foreach cfg,$(generic_defconfigs),
 	  printf "  %-24s - Build generic kernel for $(call describe_generic_defconfig,$(cfg))\n" $(cfg);)
 	echo
 	echo '  The following legacy default configurations have been converted to'
 	echo '  generic and can still be used:'
 	echo
 	$(foreach cfg,$(sort $(legacy_defconfigs)),
 	  printf "  %-24s - Build $($(cfg)-y)\n" $(cfg);)
 	echo
 	echo '  Otherwise, the following default configurations are available:'
 endef

 generic_config_dir = $(srctree)/arch/$(ARCH)/configs/generic
 generic_defconfigs :=

 #
 # If the user generates a generic kernel configuration without specifying a
 # list of boards to include the config fragments for, default to including all
 # available board config fragments.
 #
 ifeq ($(BOARDS),)
 BOARDS = $(patsubst board-%.config,%,$(notdir $(wildcard $(generic_config_dir)/board-*.config)))
 endif

 #
 # Generic kernel configurations which merge generic_defconfig with the
 # appropriate config fragments from arch/mips/configs/generic/, resulting in
 # the ability to easily configure the kernel for a given architecture,
 # endianness & set of boards without duplicating the needed configuration in
 # hundreds of defconfig files.
 #
 define gen_generic_defconfigs
 $(foreach bits,$(1),$(foreach rev,$(2),$(foreach endian,$(3),
 target := $(bits)$(rev)$(filter el,$(endian))_defconfig
 generic_defconfigs += $$(target)
 $$(target): $(generic_config_dir)/$(bits)$(rev).config
 $$(target): $(generic_config_dir)/$(endian).config
 )))
 endef

 $(eval $(call gen_generic_defconfigs,32 64,r1 r2 r6,eb el))
 $(eval $(call gen_generic_defconfigs,micro32,r2,eb el))

 define describe_generic_defconfig
 $(subst 32r,MIPS32 r,$(subst 64r,MIPS64 r,$(subst el, little endian,$(patsubst %_defconfig,%,$(1)))))
 endef

 .PHONY: $(generic_defconfigs)
 $(generic_defconfigs):
 	$(Q)$(CONFIG_SHELL) $(srctree)/scripts/kconfig/merge_config.sh \
 		-m -O $(objtree) $(srctree)/arch/$(ARCH)/configs/generic_defconfig $^ | \
 		grep -Ev '^#'
 	$(Q)cp $(KCONFIG_CONFIG) $(objtree)/.config.$@
 	$(Q)$(MAKE) -f $(srctree)/Makefile olddefconfig \
 		KCONFIG_CONFIG=$(objtree)/.config.$@ >/dev/null
 	$(Q)$(CONFIG_SHELL) $(srctree)/arch/$(ARCH)/tools/generic-board-config.sh \
 		$(srctree) $(objtree) $(objtree)/.config.$@ $(KCONFIG_CONFIG) \
 		"$(origin BOARDS)" $(BOARDS)
 	$(Q)$(MAKE) -f $(srctree)/Makefile olddefconfig

 #
 # Prevent generic merge_config rules attempting to merge single fragments
 #
 $(generic_config_dir)/%.config: ;

 #
 # Prevent direct use of generic_defconfig, which is intended to be used as the
 # basis of the various ISA-specific targets generated above.
 #
 .PHONY: generic_defconfig
 generic_defconfig:
 	$(Q)echo "generic_defconfig is not intended for direct use, but should instead be"
 	$(Q)echo "used via an ISA-specific target from the following list:"
 	$(Q)echo
 	$(Q)for cfg in $(generic_defconfigs); do echo "  $${cfg}"; done
 	$(Q)echo
 	$(Q)false

 #
 # Legacy defconfig compatibility - these targets used to be real defconfigs but
 # now that the boards have been converted to use the generic kernel they are
 # wrappers around the generic rules above.
 #
 legacy_defconfigs		+= ocelot_defconfig
 ocelot_defconfig-y		:= 32r2el_defconfig BOARDS=ocelot

 legacy_defconfigs		+= sead3_defconfig
 sead3_defconfig-y		:= 32r2el_defconfig BOARDS=sead-3

 legacy_defconfigs		+= sead3micro_defconfig
 sead3micro_defconfig-y		:= micro32r2el_defconfig BOARDS=sead-3

 legacy_defconfigs		+= xilfpga_defconfig
 xilfpga_defconfig-y		:= 32r2el_defconfig BOARDS=xilfpga

 .PHONY: $(legacy_defconfigs)
 $(legacy_defconfigs):
 	$(Q)$(MAKE) -f $(srctree)/Makefile $($@-y)
	#
	# This file is subject to the terms and conditions of the GNU General Public
	# License. See the file "COPYING" in the main directory of this archive
	# for more details.
	#
	# Copyright (C) 1994, 95, 96, 2003 by Ralf Baechle
	# DECStation modifications by Paul M. Antoine, 1996
	# Copyright (C) 2002, 2003, 2004 Maciej W. Rozycki
	#
	# This file is included by the global makefile so that you can add your own
	# architecture-specific flags and dependencies. Remember to do have actions
	# for "archclean" cleaning up for this architecture.
	#

	archscripts: scripts_basic
	$(Q)$(MAKE) $(build)=arch/mips/tools elf-entry
	ifeq ($(CONFIG_CPU_LOONGSON3_WORKAROUNDS),y)
	$(Q)$(MAKE) $(build)=arch/mips/tools loongson3-llsc-check
	endif
	$(Q)$(MAKE) $(build)=arch/mips/boot/tools relocs

	KBUILD_DEFCONFIG := 32r2el_defconfig
	KBUILD_DTBS := dtbs

	#
	# Select the object file format to substitute into the linker script.
	#
	ifdef CONFIG_CPU_LITTLE_ENDIAN
	32bit-tool-archpref = mipsel
	64bit-tool-archpref = mips64el
	32bit-bfd = elf32-tradlittlemips
	64bit-bfd = elf64-tradlittlemips
	32bit-emul = elf32ltsmip
	64bit-emul = elf64ltsmip
	else
	32bit-tool-archpref = mips
	64bit-tool-archpref = mips64
	32bit-bfd = elf32-tradbigmips
	64bit-bfd = elf64-tradbigmips
	32bit-emul = elf32btsmip
	64bit-emul = elf64btsmip
	endif

	ifdef CONFIG_32BIT
	tool-archpref = $(32bit-tool-archpref)
	UTS_MACHINE := mips
	endif
	ifdef CONFIG_64BIT
	tool-archpref = $(64bit-tool-archpref)
	UTS_MACHINE := mips64
	endif

	ifneq ($(SUBARCH),$(ARCH))
	ifeq ($(CROSS_COMPILE),)
	CROSS_COMPILE := $(call cc-cross-prefix, $(tool-archpref)-linux- $(tool-archpref)-linux-gnu- $(tool-archpref)-unknown-linux-gnu-)
	endif
	endif

	ifdef CONFIG_FUNCTION_GRAPH_TRACER
	ifndef KBUILD_MCOUNT_RA_ADDRESS
	ifeq ($(call cc-option-yn,-mmcount-ra-address), y)
	cflags-y += -mmcount-ra-address -DKBUILD_MCOUNT_RA_ADDRESS
	endif
	endif
	endif
	cflags-y += $(call cc-option, -mno-check-zero-division)

	ifdef CONFIG_32BIT
	ld-emul = $(32bit-emul)
	vmlinux-32 = vmlinux
	vmlinux-64 = vmlinux.64

	cflags-y += -mabi=32
	endif

	ifdef CONFIG_64BIT
	ld-emul = $(64bit-emul)
	vmlinux-32 = vmlinux.32
	vmlinux-64 = vmlinux

	cflags-y += -mabi=64
	endif

	all-$(CONFIG_BOOT_ELF32) := $(vmlinux-32)
	all-$(CONFIG_BOOT_ELF64) := $(vmlinux-64)
	all-$(CONFIG_SYS_SUPPORTS_ZBOOT)+= vmlinuz

	#
	# GCC uses -G 0 -mabicalls -fpic as default. We don't want PIC in the kernel
	# code since it only slows down the whole thing. At some point we might make
	# use of global pointer optimizations but their use of $28 conflicts with
	# the current pointer optimization.
	#
	# The DECStation requires an ECOFF kernel for remote booting, other MIPS
	# machines may also. Since BFD is incredibly buggy with respect to
	# crossformat linking we rely on the elf2ecoff tool for format conversion.
	#
	cflags-y += -G 0 -mno-abicalls -fno-pic -pipe
	cflags-y += -msoft-float
	LDFLAGS_vmlinux += -G 0 -static -n -nostdlib
	KBUILD_AFLAGS_MODULE += -mlong-calls
	KBUILD_CFLAGS_MODULE += -mlong-calls

	ifeq ($(CONFIG_RELOCATABLE),y)
	LDFLAGS_vmlinux += --emit-relocs
	endif

	#
	# pass -msoft-float to GAS if it supports it. However on newer binutils
	# (specifically newer than 2.24.51.20140728) we then also need to explicitly
	# set ".set hardfloat" in all files which manipulate floating point registers.
	#
	ifneq ($(call as-option,-Wa$(comma)-msoft-float,),)
	cflags-y += -DGAS_HAS_SET_HARDFLOAT -Wa,-msoft-float
	endif

	cflags-y += -ffreestanding

	cflags-$(CONFIG_CPU_BIG_ENDIAN) += -EB
	cflags-$(CONFIG_CPU_LITTLE_ENDIAN) += -EL

	cflags-$(CONFIG_SB1XXX_CORELIS) += $(call cc-option,-mno-sched-prolog) \
	-fno-omit-frame-pointer

	# Some distribution-specific toolchains might pass the -fstack-check
	# option during the build, which adds a simple stack-probe at the beginning
	# of every function. This stack probe is to ensure that there is enough
	# stack space, else a SEGV is generated. This is not desirable for MIPS
	# as kernel stacks are small, placed in unmapped virtual memory, and do not
	# grow when overflowed. Especially on SGI IP27 platforms, this check will
	# lead to a NULL pointer dereference in _raw_spin_lock_irq.
	#
	# In disassembly, this stack probe appears at the top of a function as:
	# sd zero,<offset>(sp)
	# Where <offset> is a negative value.
	#
	cflags-y += -fno-stack-check

	#
	# CPU-dependent compiler/assembler options for optimization.
	#
	cflags-$(CONFIG_CPU_R3000) += -march=r3000
	cflags-$(CONFIG_CPU_TX39XX) += -march=r3900
	cflags-$(CONFIG_CPU_VR41XX) += -march=r4100 -Wa,--trap
	cflags-$(CONFIG_CPU_R4X00) += -march=r4600 -Wa,--trap
	cflags-$(CONFIG_CPU_TX49XX) += -march=r4600 -Wa,--trap
	cflags-$(CONFIG_CPU_MIPS32_R1) += -march=mips32 -Wa,--trap
	cflags-$(CONFIG_CPU_MIPS32_R2) += -march=mips32r2 -Wa,--trap
	cflags-$(CONFIG_CPU_MIPS32_R5) += -march=mips32r5 -Wa,--trap -modd-spreg
	cflags-$(CONFIG_CPU_MIPS32_R6) += -march=mips32r6 -Wa,--trap -modd-spreg
	cflags-$(CONFIG_CPU_MIPS64_R1) += -march=mips64 -Wa,--trap
	cflags-$(CONFIG_CPU_MIPS64_R2) += -march=mips64r2 -Wa,--trap
	cflags-$(CONFIG_CPU_MIPS64_R5) += -march=mips64r5 -Wa,--trap
	cflags-$(CONFIG_CPU_MIPS64_R6) += -march=mips64r6 -Wa,--trap
	cflags-$(CONFIG_CPU_P5600) += -march=p5600 -Wa,--trap -modd-spreg
	cflags-$(CONFIG_CPU_R5000) += -march=r5000 -Wa,--trap
	cflags-$(CONFIG_CPU_R5500) += $(call cc-option,-march=r5500,-march=r5000) \
	-Wa,--trap
	cflags-$(CONFIG_CPU_NEVADA) += $(call cc-option,-march=rm5200,-march=r5000) \
	-Wa,--trap
	cflags-$(CONFIG_CPU_RM7000) += $(call cc-option,-march=rm7000,-march=r5000) \
	-Wa,--trap
	cflags-$(CONFIG_CPU_SB1) += $(call cc-option,-march=sb1,-march=r5000) \
	-Wa,--trap
	cflags-$(CONFIG_CPU_SB1) += $(call cc-option,-mno-mdmx)
	cflags-$(CONFIG_CPU_SB1) += $(call cc-option,-mno-mips3d)
	cflags-$(CONFIG_CPU_R10000) += $(call cc-option,-march=r10000,-march=r8000) \
	-Wa,--trap
	cflags-$(CONFIG_CPU_CAVIUM_OCTEON) += $(call cc-option,-march=octeon) -Wa,--trap
	ifeq (,$(findstring march=octeon, $(cflags-$(CONFIG_CPU_CAVIUM_OCTEON))))
	cflags-$(CONFIG_CPU_CAVIUM_OCTEON) += -Wa,-march=octeon
	endif
	cflags-$(CONFIG_CAVIUM_CN63XXP1) += -Wa,-mfix-cn63xxp1
	cflags-$(CONFIG_CPU_BMIPS) += -march=mips32 -Wa,-mips32 -Wa,--trap

	cflags-$(CONFIG_CPU_R4000_WORKAROUNDS) += $(call cc-option,-mfix-r4000,)
	cflags-$(CONFIG_CPU_R4400_WORKAROUNDS) += $(call cc-option,-mfix-r4400,)
	cflags-$(CONFIG_CPU_DADDI_WORKAROUNDS) += $(call cc-option,-mno-daddi,)

	# For smartmips configurations, there are hundreds of warnings due to ISA overrides
	# in assembly and header files. smartmips is only supported for MIPS32r1 onwards
	# and there is no support for 64-bit. Various '.set mips2' or '.set mips3' or
	# similar directives in the kernel will spam the build logs with the following warnings:
	# Warning: the `smartmips' extension requires MIPS32 revision 1 or greater
	# or
	# Warning: the 64-bit MIPS architecture does not support the `smartmips' extension
	# Pass -Wa,--no-warn to disable all assembler warnings until the kernel code has
	# been fixed properly.
	mips-cflags := $(cflags-y)
	ifeq ($(CONFIG_CPU_HAS_SMARTMIPS),y)
	smartmips-ase := $(call cc-option-yn,$(mips-cflags) -msmartmips)
	cflags-$(smartmips-ase) += -msmartmips -Wa,--no-warn
	endif
	ifeq ($(CONFIG_CPU_MICROMIPS),y)
	micromips-ase := $(call cc-option-yn,$(mips-cflags) -mmicromips)
	cflags-$(micromips-ase) += -mmicromips
	endif
	ifeq ($(CONFIG_CPU_HAS_MSA),y)
	toolchain-msa := $(call cc-option-yn,$(mips-cflags) -mhard-float -mfp64 -Wa$(comma)-mmsa)
	cflags-$(toolchain-msa) += -DTOOLCHAIN_SUPPORTS_MSA
	endif
	toolchain-virt := $(call cc-option-yn,$(mips-cflags) -mvirt)
	cflags-$(toolchain-virt) += -DTOOLCHAIN_SUPPORTS_VIRT
	# For -mmicromips, use -Wa,-fatal-warnings to catch unsupported -mxpa which
	# only warns
	xpa-cflags-y := $(mips-cflags)
	xpa-cflags-$(micromips-ase) += -mmicromips -Wa$(comma)-fatal-warnings
	toolchain-xpa := $(call cc-option-yn,$(xpa-cflags-y) -mxpa)
	cflags-$(toolchain-xpa) += -DTOOLCHAIN_SUPPORTS_XPA
	toolchain-crc := $(call cc-option-yn,$(mips-cflags) -Wa$(comma)-mcrc)
	cflags-$(toolchain-crc) += -DTOOLCHAIN_SUPPORTS_CRC
	toolchain-dsp := $(call cc-option-yn,$(mips-cflags) -Wa$(comma)-mdsp)
	cflags-$(toolchain-dsp) += -DTOOLCHAIN_SUPPORTS_DSP
	toolchain-ginv := $(call cc-option-yn,$(mips-cflags) -Wa$(comma)-mginv)
	cflags-$(toolchain-ginv) += -DTOOLCHAIN_SUPPORTS_GINV

	#
	# Firmware support
	#
	libs-$(CONFIG_FW_ARC) += arch/mips/fw/arc/
	libs-$(CONFIG_FW_CFE) += arch/mips/fw/cfe/
	libs-$(CONFIG_FW_SNIPROM) += arch/mips/fw/sni/
	libs-y += arch/mips/fw/lib/

	#
	# Kernel compression
	#
	ifdef CONFIG_SYS_SUPPORTS_ZBOOT
	COMPRESSION_FNAME = vmlinuz
	else
	COMPRESSION_FNAME = vmlinux
	endif

	#
	# Board-dependent options and extra files
	#
	include arch/mips/Kbuild.platforms

	ifdef CONFIG_PHYSICAL_START
	load-y = $(CONFIG_PHYSICAL_START)
	endif

	entry-y = $(shell $(objtree)/arch/mips/tools/elf-entry vmlinux)
	cflags-y += -I$(srctree)/arch/mips/include/asm/mach-generic
	drivers-$(CONFIG_PCI) += arch/mips/pci/

	#
	# Automatically detect the build format. By default we choose
	# the elf format according to the load address.
	# We can always force a build with a 64-bits symbol format by
	# passing 'KBUILD_SYM32=no' option to the make's command line.
	#
	ifdef CONFIG_64BIT
	ifndef KBUILD_SYM32
	ifeq ($(shell expr $(load-y) \< 0xffffffff80000000), 0)
	KBUILD_SYM32 = y
	endif
	endif

	ifeq ($(KBUILD_SYM32)$(call cc-option-yn,-msym32), yy)
	cflags-y += -msym32 -DKBUILD_64BIT_SYM32
	else
	ifeq ($(CONFIG_CPU_DADDI_WORKAROUNDS), y)
	$(error CONFIG_CPU_DADDI_WORKAROUNDS unsupported without -msym32)
	endif
	endif
	endif

	# When linking a 32-bit executable the LLVM linker cannot cope with a
	# 32-bit load address that has been sign-extended to 64 bits. Simply
	# remove the upper 32 bits then, as it is safe to do so with other
	# linkers.
	ifdef CONFIG_64BIT
	load-ld = $(load-y)
	else
	load-ld = $(subst 0xffffffff,0x,$(load-y))
	endif

	KBUILD_AFLAGS += $(cflags-y)
	KBUILD_CFLAGS += $(cflags-y)
	KBUILD_CPPFLAGS += -DVMLINUX_LOAD_ADDRESS=$(load-y) -DLINKER_LOAD_ADDRESS=$(load-ld)
	KBUILD_CPPFLAGS += -DDATAOFFSET=$(if $(dataoffset-y),$(dataoffset-y),0)

	bootvars-y = VMLINUX_LOAD_ADDRESS=$(load-y) \
	LINKER_LOAD_ADDRESS=$(load-ld) \
	VMLINUX_ENTRY_ADDRESS=$(entry-y) \
	PLATFORM="$(platform-y)" \
	ITS_INPUTS="$(its-y)"
	ifdef CONFIG_32BIT
	bootvars-y += ADDR_BITS=32
	endif
	ifdef CONFIG_64BIT
	bootvars-y += ADDR_BITS=64
	endif

	# This is required to get dwarf unwinding tables into .debug_frame
	# instead of .eh_frame so we don't discard them.
	KBUILD_CFLAGS += -fno-asynchronous-unwind-tables

	KBUILD_LDFLAGS += -m $(ld-emul)

	ifdef CONFIG_MIPS
	CHECKFLAGS += $(shell $(CC) $(KBUILD_CFLAGS) -dM -E -x c /dev/null \| \
	egrep -vw '__GNUC_(\|MINOR_\|PATCHLEVEL_)_' \| \
	sed -e "s/^\#define /-D'/" -e "s/ /'='/" -e "s/$$/'/" -e 's/\$$/&&/g')
	endif

	OBJCOPYFLAGS += --remove-section=.reginfo

	head-y := arch/mips/kernel/head.o

	libs-y += arch/mips/lib/
	libs-$(CONFIG_MIPS_FP_SUPPORT) += arch/mips/math-emu/

	# See arch/mips/Kbuild for content of core part of the kernel
	core-y += arch/mips/

	drivers-y += arch/mips/crypto/
	drivers-$(CONFIG_OPROFILE) += arch/mips/oprofile/

	# suspend and hibernation support
	drivers-$(CONFIG_PM) += arch/mips/power/

	# boot image targets (arch/mips/boot/)
	boot-y := vmlinux.bin
	boot-y += vmlinux.ecoff
	boot-y += vmlinux.srec
	ifeq ($(shell expr $(load-y) \< 0xffffffff80000000 2> /dev/null), 0)
	boot-y += uImage
	boot-y += uImage.bin
	boot-y += uImage.bz2
	boot-y += uImage.gz
	boot-y += uImage.lzma
	boot-y += uImage.lzo
	endif
	boot-y += vmlinux.itb
	boot-y += vmlinux.gz.itb
	boot-y += vmlinux.bz2.itb
	boot-y += vmlinux.lzma.itb
	boot-y += vmlinux.lzo.itb

	# compressed boot image targets (arch/mips/boot/compressed/)
	bootz-y := vmlinuz
	bootz-y += vmlinuz.bin
	bootz-y += vmlinuz.ecoff
	bootz-y += vmlinuz.srec
	ifeq ($(shell expr $(zload-y) \< 0xffffffff80000000 2> /dev/null), 0)
	bootz-y += uzImage.bin
	endif
	bootz-y += vmlinuz.itb

	#
	# Some machines like the Indy need 32-bit ELF binaries for booting purposes.
	# Other need ECOFF, so we build a 32-bit ELF binary for them which we then
	# convert to ECOFF using elf2ecoff.
	#
	quiet_cmd_32 = OBJCOPY $@
	cmd_32 = $(OBJCOPY) -O $(32bit-bfd) $(OBJCOPYFLAGS) $< $@
	vmlinux.32: vmlinux
	$(call cmd,32)

	#
	# The 64-bit ELF tools are pretty broken so at this time we generate 64-bit
	# ELF files from 32-bit files by conversion.
	#
	quiet_cmd_64 = OBJCOPY $@
	cmd_64 = $(OBJCOPY) -O $(64bit-bfd) $(OBJCOPYFLAGS) $< $@
	vmlinux.64: vmlinux
	$(call cmd,64)

	all: $(all-y) $(KBUILD_DTBS)

	# boot
	$(boot-y): $(vmlinux-32) FORCE
	$(Q)$(MAKE) $(build)=arch/mips/boot VMLINUX=$(vmlinux-32) \
	$(bootvars-y) arch/mips/boot/$@

	ifdef CONFIG_SYS_SUPPORTS_ZBOOT
	# boot/compressed
	$(bootz-y): $(vmlinux-32) FORCE
	$(Q)$(MAKE) $(build)=arch/mips/boot/compressed \
	$(bootvars-y) 32bit-bfd=$(32bit-bfd) arch/mips/boot/$@
	else
	vmlinuz: FORCE
	@echo ' CONFIG_SYS_SUPPORTS_ZBOOT is not enabled'
	/bin/false
	endif


	CLEAN_FILES += vmlinux.32 vmlinux.64

	# device-trees
	core-y += arch/mips/boot/dts/

	archprepare:
	ifdef CONFIG_MIPS32_N32
	@$(kecho) ' Checking missing-syscalls for N32'
	$(Q)$(MAKE) $(build)=. missing-syscalls missing_syscalls_flags="-mabi=n32"
	endif
	ifdef CONFIG_MIPS32_O32
	@$(kecho) ' Checking missing-syscalls for O32'
	$(Q)$(MAKE) $(build)=. missing-syscalls missing_syscalls_flags="-mabi=32"
	endif

	install:
	$(Q)install -D -m 755 vmlinux $(INSTALL_PATH)/vmlinux-$(KERNELRELEASE)
	ifdef CONFIG_SYS_SUPPORTS_ZBOOT
	$(Q)install -D -m 755 vmlinuz $(INSTALL_PATH)/vmlinuz-$(KERNELRELEASE)
	endif
	$(Q)install -D -m 644 .config $(INSTALL_PATH)/config-$(KERNELRELEASE)
	$(Q)install -D -m 644 System.map $(INSTALL_PATH)/System.map-$(KERNELRELEASE)

	archclean:
	$(Q)$(MAKE) $(clean)=arch/mips/boot
	$(Q)$(MAKE) $(clean)=arch/mips/boot/compressed
	$(Q)$(MAKE) $(clean)=arch/mips/boot/tools

	archheaders:
	$(Q)$(MAKE) $(build)=arch/mips/kernel/syscalls all

	define archhelp
	echo ' install - install kernel into $(INSTALL_PATH)'
	echo ' vmlinux.ecoff - ECOFF boot image'
	echo ' vmlinux.bin - Raw binary boot image'
	echo ' vmlinux.srec - SREC boot image'
	echo ' vmlinux.32 - 64-bit boot image wrapped in 32bits (IP22/IP32)'
	echo ' vmlinuz - Compressed boot(zboot) image'
	echo ' vmlinuz.ecoff - ECOFF zboot image'
	echo ' vmlinuz.bin - Raw binary zboot image'
	echo ' vmlinuz.srec - SREC zboot image'
	echo ' uImage - U-Boot image'
	echo ' uImage.bin - U-Boot image (uncompressed)'
	echo ' uImage.bz2 - U-Boot image (bz2)'
	echo ' uImage.gz - U-Boot image (gzip)'
	echo ' uImage.lzma - U-Boot image (lzma)'
	echo ' uImage.lzo - U-Boot image (lzo)'
	echo ' uzImage.bin - U-Boot image (self-extracting)'
	echo
	echo ' These will be default as appropriate for a configured platform.'
	echo
	echo ' If you are targeting a system supported by generic kernels you may'
	echo ' configure the kernel for a given architecture target like so:'
	echo
	echo ' {micro32,32,64}{r1,r2,r6}{el,}_defconfig <BOARDS="list of boards">'
	echo
	echo ' Where BOARDS is some subset of the following:'
	for board in $(sort $(BOARDS)); do echo " $${board}"; done
	echo
	echo ' Specifically the following generic default configurations are'
	echo ' supported:'
	echo
	$(foreach cfg,$(generic_defconfigs),
	printf " %-24s - Build generic kernel for $(call describe_generic_defconfig,$(cfg))\n" $(cfg);)
	echo
	echo ' The following legacy default configurations have been converted to'
	echo ' generic and can still be used:'
	echo
	$(foreach cfg,$(sort $(legacy_defconfigs)),
	printf " %-24s - Build $($(cfg)-y)\n" $(cfg);)
	echo
	echo ' Otherwise, the following default configurations are available:'
	endef

	generic_config_dir = $(srctree)/arch/$(ARCH)/configs/generic
	generic_defconfigs :=

	#
	# If the user generates a generic kernel configuration without specifying a
	# list of boards to include the config fragments for, default to including all
	# available board config fragments.
	#
	ifeq ($(BOARDS),)
	BOARDS = $(patsubst board-%.config,%,$(notdir $(wildcard $(generic_config_dir)/board-*.config)))
	endif

	#
	# Generic kernel configurations which merge generic_defconfig with the
	# appropriate config fragments from arch/mips/configs/generic/, resulting in
	# the ability to easily configure the kernel for a given architecture,
	# endianness & set of boards without duplicating the needed configuration in
	# hundreds of defconfig files.
	#
	define gen_generic_defconfigs
	$(foreach bits,$(1),$(foreach rev,$(2),$(foreach endian,$(3),
	target := $(bits)$(rev)$(filter el,$(endian))_defconfig
	generic_defconfigs += $$(target)
	$$(target): $(generic_config_dir)/$(bits)$(rev).config
	$$(target): $(generic_config_dir)/$(endian).config
	)))
	endef

	$(eval $(call gen_generic_defconfigs,32 64,r1 r2 r6,eb el))
	$(eval $(call gen_generic_defconfigs,micro32,r2,eb el))

	define describe_generic_defconfig
	$(subst 32r,MIPS32 r,$(subst 64r,MIPS64 r,$(subst el, little endian,$(patsubst %_defconfig,%,$(1)))))
	endef

	.PHONY: $(generic_defconfigs)
	$(generic_defconfigs):
	$(Q)$(CONFIG_SHELL) $(srctree)/scripts/kconfig/merge_config.sh \
	-m -O $(objtree) $(srctree)/arch/$(ARCH)/configs/generic_defconfig $^ \| \
	grep -Ev '^#'
	$(Q)cp $(KCONFIG_CONFIG) $(objtree)/.config.$@
	$(Q)$(MAKE) -f $(srctree)/Makefile olddefconfig \
	KCONFIG_CONFIG=$(objtree)/.config.$@ >/dev/null
	$(Q)$(CONFIG_SHELL) $(srctree)/arch/$(ARCH)/tools/generic-board-config.sh \
	$(srctree) $(objtree) $(objtree)/.config.$@ $(KCONFIG_CONFIG) \
	"$(origin BOARDS)" $(BOARDS)
	$(Q)$(MAKE) -f $(srctree)/Makefile olddefconfig

	#
	# Prevent generic merge_config rules attempting to merge single fragments
	#
	$(generic_config_dir)/%.config: ;

	#
	# Prevent direct use of generic_defconfig, which is intended to be used as the
	# basis of the various ISA-specific targets generated above.
	#
	.PHONY: generic_defconfig
	generic_defconfig:
	$(Q)echo "generic_defconfig is not intended for direct use, but should instead be"
	$(Q)echo "used via an ISA-specific target from the following list:"
	$(Q)echo
	$(Q)for cfg in $(generic_defconfigs); do echo " $${cfg}"; done
	$(Q)echo
	$(Q)false

	#
	# Legacy defconfig compatibility - these targets used to be real defconfigs but
	# now that the boards have been converted to use the generic kernel they are
	# wrappers around the generic rules above.
	#
	legacy_defconfigs += ocelot_defconfig
	ocelot_defconfig-y := 32r2el_defconfig BOARDS=ocelot

	legacy_defconfigs += sead3_defconfig
	sead3_defconfig-y := 32r2el_defconfig BOARDS=sead-3

	legacy_defconfigs += sead3micro_defconfig
	sead3micro_defconfig-y := micro32r2el_defconfig BOARDS=sead-3

	legacy_defconfigs += xilfpga_defconfig
	xilfpga_defconfig-y := 32r2el_defconfig BOARDS=xilfpga

	.PHONY: $(legacy_defconfigs)
	$(legacy_defconfigs):
	$(Q)$(MAKE) -f $(srctree)/Makefile $($@-y)