arch/mips/Makefile

   1 #
   2 # This file is subject to the terms and conditions of the GNU General Public
   3 # License.  See the file "COPYING" in the main directory of this archive
   4 # for more details.
   5 #
   6 # Copyright (C) 1994, 95, 96, 2003 by Ralf Baechle
   7 # DECStation modifications by Paul M. Antoine, 1996
   8 # Copyright (C) 2002, 2003, 2004  Maciej W. Rozycki
   9 #
  10 # This file is included by the global makefile so that you can add your own
  11 # architecture-specific flags and dependencies.
  12 #
  13
  14 archscripts: scripts_basic
  15         $(Q)$(MAKE) $(build)=arch/mips/tools elf-entry
  16 ifeq ($(CONFIG_CPU_LOONGSON3_WORKAROUNDS),y)
  17         $(Q)$(MAKE) $(build)=arch/mips/tools loongson3-llsc-check
  18 endif
  19         $(Q)$(MAKE) $(build)=arch/mips/boot/tools relocs
  20
  21 KBUILD_DEFCONFIG := 32r2el_defconfig
  22 KBUILD_DTBS      := dtbs
  23
  24 #
  25 # Select the object file format to substitute into the linker script.
  26 #
  27 ifdef CONFIG_CPU_LITTLE_ENDIAN
  28 32bit-tool-archpref     = mipsel
  29 64bit-tool-archpref     = mips64el
  30 32bit-bfd               = elf32-tradlittlemips
  31 64bit-bfd               = elf64-tradlittlemips
  32 32bit-emul              = elf32ltsmip
  33 64bit-emul              = elf64ltsmip
  34 else
  35 32bit-tool-archpref     = mips
  36 64bit-tool-archpref     = mips64
  37 32bit-bfd               = elf32-tradbigmips
  38 64bit-bfd               = elf64-tradbigmips
  39 32bit-emul              = elf32btsmip
  40 64bit-emul              = elf64btsmip
  41 endif
  42
  43 ifdef CONFIG_32BIT
  44 tool-archpref           = $(32bit-tool-archpref)
  45 UTS_MACHINE             := mips
  46 endif
  47 ifdef CONFIG_64BIT
  48 tool-archpref           = $(64bit-tool-archpref)
  49 UTS_MACHINE             := mips64
  50 endif
  51
  52 ifdef cross_compiling
  53   ifeq ($(CROSS_COMPILE),)
  54     CROSS_COMPILE := $(call cc-cross-prefix, $(tool-archpref)-linux-  $(tool-archpref)-linux-gnu-  $(tool-archpref)-unknown-linux-gnu-)
  55   endif
  56 endif
  57
  58 ifdef CONFIG_FUNCTION_GRAPH_TRACER
  59   ifndef KBUILD_MCOUNT_RA_ADDRESS
  60     ifeq ($(call cc-option-yn,-mmcount-ra-address), y)
  61       cflags-y += -mmcount-ra-address -DKBUILD_MCOUNT_RA_ADDRESS
  62     endif
  63   endif
  64 endif
  65 cflags-y += $(call cc-option, -mno-check-zero-division)
  66
  67 ifdef CONFIG_32BIT
  68 ld-emul                 = $(32bit-emul)
  69 vmlinux-32              = vmlinux
  70 vmlinux-64              = vmlinux.64
  71
  72 cflags-y                += -mabi=32
  73 endif
  74
  75 ifdef CONFIG_64BIT
  76 ld-emul                 = $(64bit-emul)
  77 vmlinux-32              = vmlinux.32
  78 vmlinux-64              = vmlinux
  79
  80 cflags-y                += -mabi=64
  81 endif
  82
  83 all-$(CONFIG_BOOT_ELF32)        := $(vmlinux-32)
  84 all-$(CONFIG_BOOT_ELF64)        := $(vmlinux-64)
  85 all-$(CONFIG_SYS_SUPPORTS_ZBOOT)+= vmlinuz
  86
  87 #
  88 # GCC uses -G 0 -mabicalls -fpic as default.  We don't want PIC in the kernel
  89 # code since it only slows down the whole thing.  At some point we might make
  90 # use of global pointer optimizations but their use of $28 conflicts with
  91 # the current pointer optimization.
  92 #
  93 # The DECStation requires an ECOFF kernel for remote booting, other MIPS
  94 # machines may also.  Since BFD is incredibly buggy with respect to
  95 # crossformat linking we rely on the elf2ecoff tool for format conversion.
  96 #
  97 cflags-y                        += -G 0 -mno-abicalls -fno-pic -pipe
  98 cflags-y                        += -msoft-float
  99 LDFLAGS_vmlinux                 += -G 0 -static -n -nostdlib
 100 KBUILD_AFLAGS_MODULE            += -mlong-calls
 101 KBUILD_CFLAGS_MODULE            += -mlong-calls
 102
 103 ifeq ($(CONFIG_RELOCATABLE),y)
 104 LDFLAGS_vmlinux                 += --emit-relocs
 105 endif
 106
 107 #
 108 # pass -msoft-float to GAS if it supports it.  However on newer binutils
 109 # (specifically newer than 2.24.51.20140728) we then also need to explicitly
 110 # set ".set hardfloat" in all files which manipulate floating point registers.
 111 #
 112 ifneq ($(call as-option,-Wa$(comma)-msoft-float,),)
 113         cflags-y                += -DGAS_HAS_SET_HARDFLOAT -Wa,-msoft-float
 114 endif
 115
 116 cflags-y += -ffreestanding
 117
 118 cflags-$(CONFIG_CPU_BIG_ENDIAN)         += -EB
 119 cflags-$(CONFIG_CPU_LITTLE_ENDIAN)      += -EL
 120
 121 cflags-$(CONFIG_SB1XXX_CORELIS) += $(call cc-option,-mno-sched-prolog) \
 122                                    -fno-omit-frame-pointer
 123
 124 # Some distribution-specific toolchains might pass the -fstack-check
 125 # option during the build, which adds a simple stack-probe at the beginning
 126 # of every function.  This stack probe is to ensure that there is enough
 127 # stack space, else a SEGV is generated.  This is not desirable for MIPS
 128 # as kernel stacks are small, placed in unmapped virtual memory, and do not
 129 # grow when overflowed.  Especially on SGI IP27 platforms, this check will
 130 # lead to a NULL pointer dereference in _raw_spin_lock_irq.
 131 #
 132 # In disassembly, this stack probe appears at the top of a function as:
 133 #    sd         zero,<offset>(sp)
 134 # Where <offset> is a negative value.
 135 #
 136 cflags-y += -fno-stack-check
 137
 138 # binutils from v2.35 when built with --enable-mips-fix-loongson3-llsc=yes,
 139 # supports an -mfix-loongson3-llsc flag which emits a sync prior to each ll
 140 # instruction to work around a CPU bug (see __SYNC_loongson3_war in asm/sync.h
 141 # for a description).
 142 #
 143 # We disable this in order to prevent the assembler meddling with the
 144 # instruction that labels refer to, ie. if we label an ll instruction:
 145 #
 146 # 1: ll v0, 0(a0)
 147 #
 148 # ...then with the assembler fix applied the label may actually point at a sync
 149 # instruction inserted by the assembler, and if we were using the label in an
 150 # exception table the table would no longer contain the address of the ll
 151 # instruction.
 152 #
 153 # Avoid this by explicitly disabling that assembler behaviour.
 154 #
 155 cflags-y += $(call as-option,-Wa$(comma)-mno-fix-loongson3-llsc,)
 156
 157 #
 158 # CPU-dependent compiler/assembler options for optimization.
 159 #
 160 cflags-$(CONFIG_CPU_R3000)      += -march=r3000
 161 cflags-$(CONFIG_CPU_TX39XX)     += -march=r3900
 162 cflags-$(CONFIG_CPU_R4300)      += -march=r4300 -Wa,--trap
 163 cflags-$(CONFIG_CPU_VR41XX)     += -march=r4100 -Wa,--trap
 164 cflags-$(CONFIG_CPU_R4X00)      += -march=r4600 -Wa,--trap
 165 cflags-$(CONFIG_CPU_TX49XX)     += -march=r4600 -Wa,--trap
 166 cflags-$(CONFIG_CPU_MIPS32_R1)  += -march=mips32 -Wa,--trap
 167 cflags-$(CONFIG_CPU_MIPS32_R2)  += -march=mips32r2 -Wa,--trap
 168 cflags-$(CONFIG_CPU_MIPS32_R5)  += -march=mips32r5 -Wa,--trap -modd-spreg
 169 cflags-$(CONFIG_CPU_MIPS32_R6)  += -march=mips32r6 -Wa,--trap -modd-spreg
 170 cflags-$(CONFIG_CPU_MIPS64_R1)  += -march=mips64 -Wa,--trap
 171 cflags-$(CONFIG_CPU_MIPS64_R2)  += -march=mips64r2 -Wa,--trap
 172 cflags-$(CONFIG_CPU_MIPS64_R5)  += -march=mips64r5 -Wa,--trap
 173 cflags-$(CONFIG_CPU_MIPS64_R6)  += -march=mips64r6 -Wa,--trap
 174 cflags-$(CONFIG_CPU_P5600)      += -march=p5600 -Wa,--trap -modd-spreg
 175 cflags-$(CONFIG_CPU_R5000)      += -march=r5000 -Wa,--trap
 176 cflags-$(CONFIG_CPU_R5500)      += $(call cc-option,-march=r5500,-march=r5000) \
 177                         -Wa,--trap
 178 cflags-$(CONFIG_CPU_NEVADA)     += $(call cc-option,-march=rm5200,-march=r5000) \
 179                         -Wa,--trap
 180 cflags-$(CONFIG_CPU_RM7000)     += $(call cc-option,-march=rm7000,-march=r5000) \
 181                         -Wa,--trap
 182 cflags-$(CONFIG_CPU_SB1)        += $(call cc-option,-march=sb1,-march=r5000) \
 183                         -Wa,--trap
 184 cflags-$(CONFIG_CPU_SB1)        += $(call cc-option,-mno-mdmx)
 185 cflags-$(CONFIG_CPU_SB1)        += $(call cc-option,-mno-mips3d)
 186 cflags-$(CONFIG_CPU_R10000)     += $(call cc-option,-march=r10000,-march=r8000) \
 187                         -Wa,--trap
 188 cflags-$(CONFIG_CPU_CAVIUM_OCTEON) += $(call cc-option,-march=octeon) -Wa,--trap
 189 ifeq (,$(findstring march=octeon, $(cflags-$(CONFIG_CPU_CAVIUM_OCTEON))))
 190 cflags-$(CONFIG_CPU_CAVIUM_OCTEON) += -Wa,-march=octeon
 191 endif
 192 cflags-$(CONFIG_CAVIUM_CN63XXP1) += -Wa,-mfix-cn63xxp1
 193 cflags-$(CONFIG_CPU_BMIPS)      += -march=mips32 -Wa,-mips32 -Wa,--trap
 194
 195 cflags-$(CONFIG_CPU_R4000_WORKAROUNDS)  += $(call cc-option,-mfix-r4000,)
 196 cflags-$(CONFIG_CPU_R4400_WORKAROUNDS)  += $(call cc-option,-mfix-r4400,)
 197 cflags-$(CONFIG_CPU_DADDI_WORKAROUNDS)  += $(call cc-option,-mno-daddi,)
 198
 199 # For smartmips configurations, there are hundreds of warnings due to ISA overrides
 200 # in assembly and header files. smartmips is only supported for MIPS32r1 onwards
 201 # and there is no support for 64-bit. Various '.set mips2' or '.set mips3' or
 202 # similar directives in the kernel will spam the build logs with the following warnings:
 203 # Warning: the `smartmips' extension requires MIPS32 revision 1 or greater
 204 # or
 205 # Warning: the 64-bit MIPS architecture does not support the `smartmips' extension
 206 # Pass -Wa,--no-warn to disable all assembler warnings until the kernel code has
 207 # been fixed properly.
 208 mips-cflags                             := $(cflags-y)
 209 ifeq ($(CONFIG_CPU_HAS_SMARTMIPS),y)
 210 smartmips-ase                           := $(call cc-option-yn,$(mips-cflags) -msmartmips)
 211 cflags-$(smartmips-ase)                 += -msmartmips -Wa,--no-warn
 212 endif
 213 ifeq ($(CONFIG_CPU_MICROMIPS),y)
 214 micromips-ase                           := $(call cc-option-yn,$(mips-cflags) -mmicromips)
 215 cflags-$(micromips-ase)                 += -mmicromips
 216 endif
 217 ifeq ($(CONFIG_CPU_HAS_MSA),y)
 218 toolchain-msa                           := $(call cc-option-yn,$(mips-cflags) -mhard-float -mfp64 -Wa$(comma)-mmsa)
 219 cflags-$(toolchain-msa)                 += -DTOOLCHAIN_SUPPORTS_MSA
 220 endif
 221 toolchain-virt                          := $(call cc-option-yn,$(mips-cflags) -mvirt)
 222 cflags-$(toolchain-virt)                += -DTOOLCHAIN_SUPPORTS_VIRT
 223 # For -mmicromips, use -Wa,-fatal-warnings to catch unsupported -mxpa which
 224 # only warns
 225 xpa-cflags-y                            := $(mips-cflags)
 226 xpa-cflags-$(micromips-ase)             += -mmicromips -Wa$(comma)-fatal-warnings
 227 toolchain-xpa                           := $(call cc-option-yn,$(xpa-cflags-y) -mxpa)
 228 cflags-$(toolchain-xpa)                 += -DTOOLCHAIN_SUPPORTS_XPA
 229 toolchain-crc                           := $(call cc-option-yn,$(mips-cflags) -Wa$(comma)-mcrc)
 230 cflags-$(toolchain-crc)                 += -DTOOLCHAIN_SUPPORTS_CRC
 231 toolchain-dsp                           := $(call cc-option-yn,$(mips-cflags) -Wa$(comma)-mdsp)
 232 cflags-$(toolchain-dsp)                 += -DTOOLCHAIN_SUPPORTS_DSP
 233 toolchain-ginv                          := $(call cc-option-yn,$(mips-cflags) -Wa$(comma)-mginv)
 234 cflags-$(toolchain-ginv)                += -DTOOLCHAIN_SUPPORTS_GINV
 235
 236 #
 237 # Firmware support
 238 #
 239 libs-$(CONFIG_FW_ARC)           += arch/mips/fw/arc/
 240 libs-$(CONFIG_FW_CFE)           += arch/mips/fw/cfe/
 241 libs-$(CONFIG_FW_SNIPROM)       += arch/mips/fw/sni/
 242 libs-y                          += arch/mips/fw/lib/
 243
 244 #
 245 # Kernel compression
 246 #
 247 ifdef CONFIG_SYS_SUPPORTS_ZBOOT
 248 COMPRESSION_FNAME               = vmlinuz
 249 else
 250 COMPRESSION_FNAME               = vmlinux
 251 endif
 252
 253 #
 254 # Board-dependent options and extra files
 255 #
 256 ifdef need-compiler
 257 include $(srctree)/arch/mips/Kbuild.platforms
 258 endif
 259
 260 ifdef CONFIG_PHYSICAL_START
 261 load-y                                  = $(CONFIG_PHYSICAL_START)
 262 endif
 263
 264 entry-y                         = $(shell $(objtree)/arch/mips/tools/elf-entry vmlinux)
 265 cflags-y                        += -I$(srctree)/arch/mips/include/asm/mach-generic
 266 drivers-$(CONFIG_PCI)           += arch/mips/pci/
 267
 268 #
 269 # Automatically detect the build format. By default we choose
 270 # the elf format according to the load address.
 271 # We can always force a build with a 64-bits symbol format by
 272 # passing 'KBUILD_SYM32=no' option to the make's command line.
 273 #
 274 ifdef CONFIG_64BIT
 275   ifndef KBUILD_SYM32
 276     ifeq ($(shell expr $(load-y) \< 0xffffffff80000000), 0)
 277       KBUILD_SYM32 = y
 278     endif
 279   endif
 280
 281   ifeq ($(KBUILD_SYM32)$(call cc-option-yn,-msym32), yy)
 282     cflags-y += -msym32 -DKBUILD_64BIT_SYM32
 283   else
 284     ifeq ($(CONFIG_CPU_DADDI_WORKAROUNDS), y)
 285       $(error CONFIG_CPU_DADDI_WORKAROUNDS unsupported without -msym32)
 286     endif
 287   endif
 288 endif
 289
 290 # When linking a 32-bit executable the LLVM linker cannot cope with a
 291 # 32-bit load address that has been sign-extended to 64 bits.  Simply
 292 # remove the upper 32 bits then, as it is safe to do so with other
 293 # linkers.
 294 ifdef CONFIG_64BIT
 295         load-ld                 = $(load-y)
 296 else
 297         load-ld                 = $(subst 0xffffffff,0x,$(load-y))
 298 endif
 299
 300 KBUILD_AFLAGS   += $(cflags-y)
 301 KBUILD_CFLAGS   += $(cflags-y)
 302 KBUILD_CPPFLAGS += -DVMLINUX_LOAD_ADDRESS=$(load-y) -DLINKER_LOAD_ADDRESS=$(load-ld)
 303 KBUILD_CPPFLAGS += -DDATAOFFSET=$(if $(dataoffset-y),$(dataoffset-y),0)
 304
 305 bootvars-y      = VMLINUX_LOAD_ADDRESS=$(load-y) \
 306                   LINKER_LOAD_ADDRESS=$(load-ld) \
 307                   VMLINUX_ENTRY_ADDRESS=$(entry-y) \
 308                   PLATFORM="$(platform-y)" \
 309                   ITS_INPUTS="$(its-y)"
 310 ifdef CONFIG_32BIT
 311 bootvars-y      += ADDR_BITS=32
 312 endif
 313 ifdef CONFIG_64BIT
 314 bootvars-y      += ADDR_BITS=64
 315 endif
 316
 317 # This is required to get dwarf unwinding tables into .debug_frame
 318 # instead of .eh_frame so we don't discard them.
 319 KBUILD_CFLAGS += -fno-asynchronous-unwind-tables
 320
 321 KBUILD_LDFLAGS          += -m $(ld-emul)
 322
 323 ifdef CONFIG_MIPS
 324 CHECKFLAGS += $(shell $(CC) $(KBUILD_CFLAGS) -dM -E -x c /dev/null | \
 325         egrep -vw '__GNUC_(MINOR_|PATCHLEVEL_)?_' | \
 326         sed -e "s/^\#define /-D'/" -e "s/ /'='/" -e "s/$$/'/" -e 's/\$$/&&/g')
 327 endif
 328
 329 OBJCOPYFLAGS            += --remove-section=.reginfo
 330
 331 head-y := arch/mips/kernel/head.o
 332
 333 libs-y                  += arch/mips/lib/
 334 libs-$(CONFIG_MIPS_FP_SUPPORT) += arch/mips/math-emu/
 335
 336 drivers-y                       += arch/mips/crypto/
 337
 338 # suspend and hibernation support
 339 drivers-$(CONFIG_PM)    += arch/mips/power/
 340
 341 # boot image targets (arch/mips/boot/)
 342 boot-y                  := vmlinux.bin
 343 boot-y                  += vmlinux.ecoff
 344 boot-y                  += vmlinux.srec
 345 ifeq ($(shell expr $(load-y) \< 0xffffffff80000000 2> /dev/null), 0)
 346 boot-y                  += uImage
 347 boot-y                  += uImage.bin
 348 boot-y                  += uImage.bz2
 349 boot-y                  += uImage.gz
 350 boot-y                  += uImage.lzma
 351 boot-y                  += uImage.lzo
 352 endif
 353 boot-y                  += vmlinux.itb
 354 boot-y                  += vmlinux.gz.itb
 355 boot-y                  += vmlinux.bz2.itb
 356 boot-y                  += vmlinux.lzma.itb
 357 boot-y                  += vmlinux.lzo.itb
 358
 359 # compressed boot image targets (arch/mips/boot/compressed/)
 360 bootz-y                 := vmlinuz
 361 bootz-y                 += vmlinuz.bin
 362 bootz-y                 += vmlinuz.ecoff
 363 bootz-y                 += vmlinuz.srec
 364 ifeq ($(shell expr $(zload-y) \< 0xffffffff80000000 2> /dev/null), 0)
 365 bootz-y                 += uzImage.bin
 366 endif
 367 bootz-y                 += vmlinuz.itb
 368
 369 #
 370 # Some machines like the Indy need 32-bit ELF binaries for booting purposes.
 371 # Other need ECOFF, so we build a 32-bit ELF binary for them which we then
 372 # convert to ECOFF using elf2ecoff.
 373 #
 374 quiet_cmd_32 = OBJCOPY $@
 375         cmd_32 = $(OBJCOPY) -O $(32bit-bfd) $(OBJCOPYFLAGS) $< $@
 376 vmlinux.32: vmlinux
 377         $(call cmd,32)
 378
 379 #
 380 # The 64-bit ELF tools are pretty broken so at this time we generate 64-bit
 381 # ELF files from 32-bit files by conversion.
 382 #
 383 quiet_cmd_64 = OBJCOPY $@
 384         cmd_64 = $(OBJCOPY) -O $(64bit-bfd) $(OBJCOPYFLAGS) $< $@
 385 vmlinux.64: vmlinux
 386         $(call cmd,64)
 387
 388 all:    $(all-y) $(KBUILD_DTBS)
 389
 390 # boot
 391 $(boot-y): $(vmlinux-32) FORCE
 392         $(Q)$(MAKE) $(build)=arch/mips/boot VMLINUX=$(vmlinux-32) \
 393                 $(bootvars-y) arch/mips/boot/$@
 394
 395 ifdef CONFIG_SYS_SUPPORTS_ZBOOT
 396 # boot/compressed
 397 $(bootz-y): $(vmlinux-32) FORCE
 398         $(Q)$(MAKE) $(build)=arch/mips/boot/compressed \
 399                 $(bootvars-y) 32bit-bfd=$(32bit-bfd) arch/mips/boot/$@
 400 else
 401 vmlinuz: FORCE
 402         @echo '   CONFIG_SYS_SUPPORTS_ZBOOT is not enabled'
 403         /bin/false
 404 endif
 405
 406
 407 CLEAN_FILES += vmlinux.32 vmlinux.64
 408
 409 # device-trees
 410 core-y += arch/mips/boot/dts/
 411
 412 archprepare:
 413 ifdef CONFIG_MIPS32_N32
 414         @$(kecho) '  Checking missing-syscalls for N32'
 415         $(Q)$(MAKE) $(build)=. missing-syscalls missing_syscalls_flags="-mabi=n32"
 416 endif
 417 ifdef CONFIG_MIPS32_O32
 418         @$(kecho) '  Checking missing-syscalls for O32'
 419         $(Q)$(MAKE) $(build)=. missing-syscalls missing_syscalls_flags="-mabi=32"
 420 endif
 421
 422 install:
 423         $(Q)install -D -m 755 vmlinux $(INSTALL_PATH)/vmlinux-$(KERNELRELEASE)
 424 ifdef CONFIG_SYS_SUPPORTS_ZBOOT
 425         $(Q)install -D -m 755 vmlinuz $(INSTALL_PATH)/vmlinuz-$(KERNELRELEASE)
 426 endif
 427         $(Q)install -D -m 644 .config $(INSTALL_PATH)/config-$(KERNELRELEASE)
 428         $(Q)install -D -m 644 System.map $(INSTALL_PATH)/System.map-$(KERNELRELEASE)
 429
 430 archheaders:
 431         $(Q)$(MAKE) $(build)=arch/mips/kernel/syscalls all
 432
 433 define archhelp
 434         echo '  install              - install kernel into $(INSTALL_PATH)'
 435         echo '  vmlinux.ecoff        - ECOFF boot image'
 436         echo '  vmlinux.bin          - Raw binary boot image'
 437         echo '  vmlinux.srec         - SREC boot image'
 438         echo '  vmlinux.32           - 64-bit boot image wrapped in 32bits (IP22/IP32)'
 439         echo '  vmlinuz              - Compressed boot(zboot) image'
 440         echo '  vmlinuz.ecoff        - ECOFF zboot image'
 441         echo '  vmlinuz.bin          - Raw binary zboot image'
 442         echo '  vmlinuz.srec         - SREC zboot image'
 443         echo '  uImage               - U-Boot image'
 444         echo '  uImage.bin           - U-Boot image (uncompressed)'
 445         echo '  uImage.bz2           - U-Boot image (bz2)'
 446         echo '  uImage.gz            - U-Boot image (gzip)'
 447         echo '  uImage.lzma          - U-Boot image (lzma)'
 448         echo '  uImage.lzo           - U-Boot image (lzo)'
 449         echo '  uzImage.bin          - U-Boot image (self-extracting)'
 450         echo
 451         echo '  These will be default as appropriate for a configured platform.'
 452         echo
 453         echo '  If you are targeting a system supported by generic kernels you may'
 454         echo '  configure the kernel for a given architecture target like so:'
 455         echo
 456         echo '  {micro32,32,64}{r1,r2,r6}{el,}_defconfig <BOARDS="list of boards">'
 457         echo
 458         echo '  Where BOARDS is some subset of the following:'
 459         for board in $(sort $(BOARDS)); do echo "    $${board}"; done
 460         echo
 461         echo '  Specifically the following generic default configurations are'
 462         echo '  supported:'
 463         echo
 464         $(foreach cfg,$(generic_defconfigs),
 465           printf "  %-24s - Build generic kernel for $(call describe_generic_defconfig,$(cfg))\n" $(cfg);)
 466         echo
 467         echo '  The following legacy default configurations have been converted to'
 468         echo '  generic and can still be used:'
 469         echo
 470         $(foreach cfg,$(sort $(legacy_defconfigs)),
 471           printf "  %-24s - Build $($(cfg)-y)\n" $(cfg);)
 472         echo
 473         echo '  Otherwise, the following default configurations are available:'
 474 endef
 475
 476 generic_config_dir = $(srctree)/arch/$(ARCH)/configs/generic
 477 generic_defconfigs :=
 478
 479 #
 480 # If the user generates a generic kernel configuration without specifying a
 481 # list of boards to include the config fragments for, default to including all
 482 # available board config fragments.
 483 #
 484 ifeq ($(BOARDS),)
 485 BOARDS = $(patsubst board-%.config,%,$(notdir $(wildcard $(generic_config_dir)/board-*.config)))
 486 endif
 487
 488 #
 489 # Generic kernel configurations which merge generic_defconfig with the
 490 # appropriate config fragments from arch/mips/configs/generic/, resulting in
 491 # the ability to easily configure the kernel for a given architecture,
 492 # endianness & set of boards without duplicating the needed configuration in
 493 # hundreds of defconfig files.
 494 #
 495 define gen_generic_defconfigs
 496 $(foreach bits,$(1),$(foreach rev,$(2),$(foreach endian,$(3),
 497 target := $(bits)$(rev)$(filter el,$(endian))_defconfig
 498 generic_defconfigs += $$(target)
 499 $$(target): $(generic_config_dir)/$(bits)$(rev).config
 500 $$(target): $(generic_config_dir)/$(endian).config
 501 )))
 502 endef
 503
 504 $(eval $(call gen_generic_defconfigs,32 64,r1 r2 r6,eb el))
 505 $(eval $(call gen_generic_defconfigs,micro32,r2,eb el))
 506
 507 define describe_generic_defconfig
 508 $(subst 32r,MIPS32 r,$(subst 64r,MIPS64 r,$(subst el, little endian,$(patsubst %_defconfig,%,$(1)))))
 509 endef
 510
 511 .PHONY: $(generic_defconfigs)
 512 $(generic_defconfigs):
 513         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/kconfig/merge_config.sh \
 514                 -m -O $(objtree) $(srctree)/arch/$(ARCH)/configs/generic_defconfig $^ | \
 515                 grep -Ev '^#'
 516         $(Q)cp $(KCONFIG_CONFIG) $(objtree)/.config.$@
 517         $(Q)$(MAKE) -f $(srctree)/Makefile olddefconfig \
 518                 KCONFIG_CONFIG=$(objtree)/.config.$@ >/dev/null
 519         $(Q)$(CONFIG_SHELL) $(srctree)/arch/$(ARCH)/tools/generic-board-config.sh \
 520                 $(srctree) $(objtree) $(objtree)/.config.$@ $(KCONFIG_CONFIG) \
 521                 "$(origin BOARDS)" $(BOARDS)
 522         $(Q)$(MAKE) -f $(srctree)/Makefile olddefconfig
 523
 524 #
 525 # Prevent generic merge_config rules attempting to merge single fragments
 526 #
 527 $(generic_config_dir)/%.config: ;
 528
 529 #
 530 # Prevent direct use of generic_defconfig, which is intended to be used as the
 531 # basis of the various ISA-specific targets generated above.
 532 #
 533 .PHONY: generic_defconfig
 534 generic_defconfig:
 535         $(Q)echo "generic_defconfig is not intended for direct use, but should instead be"
 536         $(Q)echo "used via an ISA-specific target from the following list:"
 537         $(Q)echo
 538         $(Q)for cfg in $(generic_defconfigs); do echo "  $${cfg}"; done
 539         $(Q)echo
 540         $(Q)false
 541
 542 #
 543 # Legacy defconfig compatibility - these targets used to be real defconfigs but
 544 # now that the boards have been converted to use the generic kernel they are
 545 # wrappers around the generic rules above.
 546 #
 547 legacy_defconfigs               += ocelot_defconfig
 548 ocelot_defconfig-y              := 32r2el_defconfig BOARDS=ocelot
 549
 550 legacy_defconfigs               += sead3_defconfig
 551 sead3_defconfig-y               := 32r2el_defconfig BOARDS=sead-3
 552
 553 legacy_defconfigs               += sead3micro_defconfig
 554 sead3micro_defconfig-y          := micro32r2el_defconfig BOARDS=sead-3
 555
 556 legacy_defconfigs               += xilfpga_defconfig
 557 xilfpga_defconfig-y             := 32r2el_defconfig BOARDS=xilfpga
 558
 559 legacy_defconfigs               += pistachio_defconfig
 560 pistachio_defconfig-y           := 32r2el_defconfig BOARDS=marduk
 561
 562 .PHONY: $(legacy_defconfigs)
 563 $(legacy_defconfigs):
 564         $(Q)$(MAKE) -f $(srctree)/Makefile $($@-y)