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c1a0e9bc88
When debugging it can be helpful to change the policy for compiler use of MIPSr6 compact branches, in order to rule out or home in on their involvement in bugs. Allow the GCC -mcompact-branches= flag to be set via Kconfig under the "Kernel hacking" menu. Signed-off-by: Paul Burton <paul.burton@imgtec.com> Cc: linux-mips@linux-mips.org Cc: linux-kernel@vger.kernel.org Patchwork: https://patchwork.linux-mips.org/patch/11178/ Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
421 lines
14 KiB
Makefile
421 lines
14 KiB
Makefile
#
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# This file is subject to the terms and conditions of the GNU General Public
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# License. See the file "COPYING" in the main directory of this archive
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# for more details.
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#
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# Copyright (C) 1994, 95, 96, 2003 by Ralf Baechle
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# DECStation modifications by Paul M. Antoine, 1996
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# Copyright (C) 2002, 2003, 2004 Maciej W. Rozycki
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#
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# This file is included by the global makefile so that you can add your own
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# architecture-specific flags and dependencies. Remember to do have actions
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# for "archclean" cleaning up for this architecture.
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#
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KBUILD_DEFCONFIG := ip22_defconfig
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#
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# Select the object file format to substitute into the linker script.
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#
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ifdef CONFIG_CPU_LITTLE_ENDIAN
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32bit-tool-archpref = mipsel
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64bit-tool-archpref = mips64el
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32bit-bfd = elf32-tradlittlemips
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64bit-bfd = elf64-tradlittlemips
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32bit-emul = elf32ltsmip
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64bit-emul = elf64ltsmip
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else
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32bit-tool-archpref = mips
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64bit-tool-archpref = mips64
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32bit-bfd = elf32-tradbigmips
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64bit-bfd = elf64-tradbigmips
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32bit-emul = elf32btsmip
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64bit-emul = elf64btsmip
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endif
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ifdef CONFIG_32BIT
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tool-archpref = $(32bit-tool-archpref)
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UTS_MACHINE := mips
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endif
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ifdef CONFIG_64BIT
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tool-archpref = $(64bit-tool-archpref)
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UTS_MACHINE := mips64
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endif
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ifneq ($(SUBARCH),$(ARCH))
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ifeq ($(CROSS_COMPILE),)
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CROSS_COMPILE := $(call cc-cross-prefix, $(tool-archpref)-linux- $(tool-archpref)-linux-gnu- $(tool-archpref)-unknown-linux-gnu-)
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endif
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endif
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ifdef CONFIG_FUNCTION_GRAPH_TRACER
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ifndef KBUILD_MCOUNT_RA_ADDRESS
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ifeq ($(call cc-option-yn,-mmcount-ra-address), y)
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cflags-y += -mmcount-ra-address -DKBUILD_MCOUNT_RA_ADDRESS
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endif
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endif
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endif
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cflags-y += $(call cc-option, -mno-check-zero-division)
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ifdef CONFIG_32BIT
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ld-emul = $(32bit-emul)
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vmlinux-32 = vmlinux
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vmlinux-64 = vmlinux.64
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cflags-y += -mabi=32
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endif
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ifdef CONFIG_64BIT
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ld-emul = $(64bit-emul)
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vmlinux-32 = vmlinux.32
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vmlinux-64 = vmlinux
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cflags-y += -mabi=64
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endif
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all-$(CONFIG_BOOT_ELF32) := $(vmlinux-32)
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all-$(CONFIG_BOOT_ELF64) := $(vmlinux-64)
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all-$(CONFIG_SYS_SUPPORTS_ZBOOT)+= vmlinuz
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#
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# GCC uses -G 0 -mabicalls -fpic as default. We don't want PIC in the kernel
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# code since it only slows down the whole thing. At some point we might make
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# use of global pointer optimizations but their use of $28 conflicts with
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# the current pointer optimization.
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#
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# The DECStation requires an ECOFF kernel for remote booting, other MIPS
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# machines may also. Since BFD is incredibly buggy with respect to
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# crossformat linking we rely on the elf2ecoff tool for format conversion.
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#
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cflags-y += -G 0 -mno-abicalls -fno-pic -pipe
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cflags-y += -msoft-float
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LDFLAGS_vmlinux += -G 0 -static -n -nostdlib
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KBUILD_AFLAGS_MODULE += -mlong-calls
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KBUILD_CFLAGS_MODULE += -mlong-calls
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#
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# pass -msoft-float to GAS if it supports it. However on newer binutils
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# (specifically newer than 2.24.51.20140728) we then also need to explicitly
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# set ".set hardfloat" in all files which manipulate floating point registers.
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#
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ifneq ($(call as-option,-Wa$(comma)-msoft-float,),)
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cflags-y += -DGAS_HAS_SET_HARDFLOAT -Wa,-msoft-float
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endif
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cflags-y += -ffreestanding
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#
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# We explicitly add the endianness specifier if needed, this allows
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# to compile kernels with a toolchain for the other endianness. We
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# carefully avoid to add it redundantly because gcc 3.3/3.4 complains
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# when fed the toolchain default!
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#
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# Certain gcc versions up to gcc 4.1.1 (probably 4.2-subversion as of
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# 2006-10-10 don't properly change the predefined symbols if -EB / -EL
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# are used, so we kludge that here. A bug has been filed at
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# http://gcc.gnu.org/bugzilla/show_bug.cgi?id=29413.
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#
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undef-all += -UMIPSEB -U_MIPSEB -U__MIPSEB -U__MIPSEB__
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undef-all += -UMIPSEL -U_MIPSEL -U__MIPSEL -U__MIPSEL__
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predef-be += -DMIPSEB -D_MIPSEB -D__MIPSEB -D__MIPSEB__
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predef-le += -DMIPSEL -D_MIPSEL -D__MIPSEL -D__MIPSEL__
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cflags-$(CONFIG_CPU_BIG_ENDIAN) += $(shell $(CC) -dumpmachine |grep -q 'mips.*el-.*' && echo -EB $(undef-all) $(predef-be))
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cflags-$(CONFIG_CPU_LITTLE_ENDIAN) += $(shell $(CC) -dumpmachine |grep -q 'mips.*el-.*' || echo -EL $(undef-all) $(predef-le))
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cflags-$(CONFIG_SB1XXX_CORELIS) += $(call cc-option,-mno-sched-prolog) \
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-fno-omit-frame-pointer
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#
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# CPU-dependent compiler/assembler options for optimization.
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#
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cflags-$(CONFIG_CPU_R3000) += -march=r3000
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cflags-$(CONFIG_CPU_TX39XX) += -march=r3900
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cflags-$(CONFIG_CPU_R6000) += -march=r6000 -Wa,--trap
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cflags-$(CONFIG_CPU_R4300) += -march=r4300 -Wa,--trap
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cflags-$(CONFIG_CPU_VR41XX) += -march=r4100 -Wa,--trap
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cflags-$(CONFIG_CPU_R4X00) += -march=r4600 -Wa,--trap
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cflags-$(CONFIG_CPU_TX49XX) += -march=r4600 -Wa,--trap
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cflags-$(CONFIG_CPU_MIPS32_R1) += $(call cc-option,-march=mips32,-mips32 -U_MIPS_ISA -D_MIPS_ISA=_MIPS_ISA_MIPS32) \
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-Wa,-mips32 -Wa,--trap
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cflags-$(CONFIG_CPU_MIPS32_R2) += $(call cc-option,-march=mips32r2,-mips32r2 -U_MIPS_ISA -D_MIPS_ISA=_MIPS_ISA_MIPS32) \
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-Wa,-mips32r2 -Wa,--trap
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cflags-$(CONFIG_CPU_MIPS32_R6) += -march=mips32r6 -Wa,--trap
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cflags-$(CONFIG_CPU_MIPS64_R1) += $(call cc-option,-march=mips64,-mips64 -U_MIPS_ISA -D_MIPS_ISA=_MIPS_ISA_MIPS64) \
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-Wa,-mips64 -Wa,--trap
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cflags-$(CONFIG_CPU_MIPS64_R2) += $(call cc-option,-march=mips64r2,-mips64r2 -U_MIPS_ISA -D_MIPS_ISA=_MIPS_ISA_MIPS64) \
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-Wa,-mips64r2 -Wa,--trap
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cflags-$(CONFIG_CPU_MIPS64_R6) += -march=mips64r6 -Wa,--trap
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cflags-$(CONFIG_CPU_R5000) += -march=r5000 -Wa,--trap
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cflags-$(CONFIG_CPU_R5432) += $(call cc-option,-march=r5400,-march=r5000) \
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-Wa,--trap
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cflags-$(CONFIG_CPU_R5500) += $(call cc-option,-march=r5500,-march=r5000) \
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-Wa,--trap
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cflags-$(CONFIG_CPU_NEVADA) += $(call cc-option,-march=rm5200,-march=r5000) \
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-Wa,--trap
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cflags-$(CONFIG_CPU_RM7000) += $(call cc-option,-march=rm7000,-march=r5000) \
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-Wa,--trap
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cflags-$(CONFIG_CPU_SB1) += $(call cc-option,-march=sb1,-march=r5000) \
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-Wa,--trap
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cflags-$(CONFIG_CPU_SB1) += $(call cc-option,-mno-mdmx)
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cflags-$(CONFIG_CPU_SB1) += $(call cc-option,-mno-mips3d)
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cflags-$(CONFIG_CPU_R8000) += -march=r8000 -Wa,--trap
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cflags-$(CONFIG_CPU_R10000) += $(call cc-option,-march=r10000,-march=r8000) \
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-Wa,--trap
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cflags-$(CONFIG_CPU_CAVIUM_OCTEON) += $(call cc-option,-march=octeon) -Wa,--trap
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ifeq (,$(findstring march=octeon, $(cflags-$(CONFIG_CPU_CAVIUM_OCTEON))))
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cflags-$(CONFIG_CPU_CAVIUM_OCTEON) += -Wa,-march=octeon
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endif
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cflags-$(CONFIG_CAVIUM_CN63XXP1) += -Wa,-mfix-cn63xxp1
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cflags-$(CONFIG_CPU_BMIPS) += -march=mips32 -Wa,-mips32 -Wa,--trap
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#
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# binutils from v2.25 on and gcc starting from v4.9.0 treat -march=loongson3a
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# as MIPS64 R1; older versions as just R1. This leaves the possibility open
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# that GCC might generate R2 code for -march=loongson3a which then is rejected
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# by GAS. The cc-option can't probe for this behaviour so -march=loongson3a
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# can't easily be used safely within the kbuild framework.
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#
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cflags-$(CONFIG_CPU_LOONGSON3) += \
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$(call cc-option,-march=mips64r2,-mips64r2 -U_MIPS_ISA -D_MIPS_ISA=_MIPS_ISA_MIPS64) \
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-Wa,-mips64r2 -Wa,--trap
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cflags-$(CONFIG_CPU_R4000_WORKAROUNDS) += $(call cc-option,-mfix-r4000,)
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cflags-$(CONFIG_CPU_R4400_WORKAROUNDS) += $(call cc-option,-mfix-r4400,)
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cflags-$(CONFIG_CPU_DADDI_WORKAROUNDS) += $(call cc-option,-mno-daddi,)
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# For smartmips configurations, there are hundreds of warnings due to ISA overrides
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# in assembly and header files. smartmips is only supported for MIPS32r1 onwards
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# and there is no support for 64-bit. Various '.set mips2' or '.set mips3' or
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# similar directives in the kernel will spam the build logs with the following warnings:
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# Warning: the `smartmips' extension requires MIPS32 revision 1 or greater
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# or
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# Warning: the 64-bit MIPS architecture does not support the `smartmips' extension
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# Pass -Wa,--no-warn to disable all assembler warnings until the kernel code has
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# been fixed properly.
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mips-cflags := $(cflags-y)
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ifeq ($(CONFIG_CPU_HAS_SMARTMIPS),y)
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smartmips-ase := $(call cc-option-yn,$(mips-cflags) -msmartmips)
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cflags-$(smartmips-ase) += -msmartmips -Wa,--no-warn
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endif
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ifeq ($(CONFIG_CPU_MICROMIPS),y)
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micromips-ase := $(call cc-option-yn,$(mips-cflags) -mmicromips)
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cflags-$(micromips-ase) += -mmicromips
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endif
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ifeq ($(CONFIG_CPU_HAS_MSA),y)
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toolchain-msa := $(call cc-option-yn,$(mips-cflags) -mhard-float -mfp64 -Wa$(comma)-mmsa)
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cflags-$(toolchain-msa) += -DTOOLCHAIN_SUPPORTS_MSA
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endif
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cflags-$(CONFIG_MIPS_COMPACT_BRANCHES_NEVER) += -mcompact-branches=never
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cflags-$(CONFIG_MIPS_COMPACT_BRANCHES_OPTIMAL) += -mcompact-branches=optimal
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cflags-$(CONFIG_MIPS_COMPACT_BRANCHES_ALWAYS) += -mcompact-branches=always
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#
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# Firmware support
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#
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libs-$(CONFIG_FW_ARC) += arch/mips/fw/arc/
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libs-$(CONFIG_FW_CFE) += arch/mips/fw/cfe/
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libs-$(CONFIG_FW_SNIPROM) += arch/mips/fw/sni/
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libs-y += arch/mips/fw/lib/
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#
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# Kernel compression
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#
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ifdef SYS_SUPPORTS_ZBOOT
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COMPRESSION_FNAME = vmlinuz
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else
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COMPRESSION_FNAME = vmlinux
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endif
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#
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# Board-dependent options and extra files
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#
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include arch/mips/Kbuild.platforms
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ifdef CONFIG_PHYSICAL_START
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load-y = $(CONFIG_PHYSICAL_START)
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endif
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entry-y = 0x$(shell $(NM) vmlinux 2>/dev/null \
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| grep "\bkernel_entry\b" | cut -f1 -d \ )
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cflags-y += -I$(srctree)/arch/mips/include/asm/mach-generic
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drivers-$(CONFIG_PCI) += arch/mips/pci/
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#
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# Automatically detect the build format. By default we choose
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# the elf format according to the load address.
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# We can always force a build with a 64-bits symbol format by
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# passing 'KBUILD_SYM32=no' option to the make's command line.
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#
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ifdef CONFIG_64BIT
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ifndef KBUILD_SYM32
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ifeq ($(shell expr $(load-y) \< 0xffffffff80000000), 0)
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KBUILD_SYM32 = y
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endif
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endif
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ifeq ($(KBUILD_SYM32)$(call cc-option-yn,-msym32), yy)
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cflags-y += -msym32 -DKBUILD_64BIT_SYM32
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else
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ifeq ($(CONFIG_CPU_DADDI_WORKAROUNDS), y)
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$(error CONFIG_CPU_DADDI_WORKAROUNDS unsupported without -msym32)
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endif
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endif
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endif
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KBUILD_AFLAGS += $(cflags-y)
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KBUILD_CFLAGS += $(cflags-y)
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KBUILD_CPPFLAGS += -DVMLINUX_LOAD_ADDRESS=$(load-y)
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KBUILD_CPPFLAGS += -DDATAOFFSET=$(if $(dataoffset-y),$(dataoffset-y),0)
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bootvars-y = VMLINUX_LOAD_ADDRESS=$(load-y) \
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VMLINUX_ENTRY_ADDRESS=$(entry-y)
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LDFLAGS += -m $(ld-emul)
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ifdef CONFIG_MIPS
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CHECKFLAGS += $(shell $(CC) $(KBUILD_CFLAGS) -dM -E -x c /dev/null | \
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egrep -vw '__GNUC_(|MINOR_|PATCHLEVEL_)_' | \
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sed -e "s/^\#define /-D'/" -e "s/ /'='/" -e "s/$$/'/" -e 's/\$$/&&/g')
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ifdef CONFIG_64BIT
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CHECKFLAGS += -m64
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endif
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endif
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OBJCOPYFLAGS += --remove-section=.reginfo
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head-y := arch/mips/kernel/head.o
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libs-y += arch/mips/lib/
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libs-y += arch/mips/math-emu/
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# See arch/mips/Kbuild for content of core part of the kernel
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core-y += arch/mips/
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drivers-$(CONFIG_OPROFILE) += arch/mips/oprofile/
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# suspend and hibernation support
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drivers-$(CONFIG_PM) += arch/mips/power/
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# boot image targets (arch/mips/boot/)
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boot-y := vmlinux.bin
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boot-y += vmlinux.ecoff
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boot-y += vmlinux.srec
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ifeq ($(shell expr $(load-y) \< 0xffffffff80000000 2> /dev/null), 0)
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boot-y += uImage
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boot-y += uImage.bin
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boot-y += uImage.bz2
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boot-y += uImage.gz
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boot-y += uImage.lzma
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boot-y += uImage.lzo
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endif
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# compressed boot image targets (arch/mips/boot/compressed/)
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bootz-y := vmlinuz
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bootz-y += vmlinuz.bin
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bootz-y += vmlinuz.ecoff
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bootz-y += vmlinuz.srec
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ifdef CONFIG_LASAT
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rom.bin rom.sw: vmlinux
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$(Q)$(MAKE) $(build)=arch/mips/lasat/image \
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$(bootvars-y) $@
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endif
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#
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# Some machines like the Indy need 32-bit ELF binaries for booting purposes.
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# Other need ECOFF, so we build a 32-bit ELF binary for them which we then
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# convert to ECOFF using elf2ecoff.
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#
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quiet_cmd_32 = OBJCOPY $@
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cmd_32 = $(OBJCOPY) -O $(32bit-bfd) $(OBJCOPYFLAGS) $< $@
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vmlinux.32: vmlinux
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$(call cmd,32)
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#
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# The 64-bit ELF tools are pretty broken so at this time we generate 64-bit
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# ELF files from 32-bit files by conversion.
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#
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quiet_cmd_64 = OBJCOPY $@
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cmd_64 = $(OBJCOPY) -O $(64bit-bfd) $(OBJCOPYFLAGS) $< $@
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vmlinux.64: vmlinux
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$(call cmd,64)
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all: $(all-y)
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# boot
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$(boot-y): $(vmlinux-32) FORCE
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$(Q)$(MAKE) $(build)=arch/mips/boot VMLINUX=$(vmlinux-32) \
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$(bootvars-y) arch/mips/boot/$@
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ifdef CONFIG_SYS_SUPPORTS_ZBOOT
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# boot/compressed
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$(bootz-y): $(vmlinux-32) FORCE
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$(Q)$(MAKE) $(build)=arch/mips/boot/compressed \
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$(bootvars-y) 32bit-bfd=$(32bit-bfd) $@
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else
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vmlinuz: FORCE
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@echo ' CONFIG_SYS_SUPPORTS_ZBOOT is not enabled'
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/bin/false
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endif
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CLEAN_FILES += vmlinux.32 vmlinux.64
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# device-trees
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core-$(CONFIG_BUILTIN_DTB) += arch/mips/boot/dts/
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%.dtb %.dtb.S %.dtb.o: | scripts
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$(Q)$(MAKE) $(build)=arch/mips/boot/dts arch/mips/boot/dts/$@
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PHONY += dtbs
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dtbs: scripts
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$(Q)$(MAKE) $(build)=arch/mips/boot/dts
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PHONY += dtbs_install
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dtbs_install:
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$(Q)$(MAKE) $(dtbinst)=arch/mips/boot/dts
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archprepare:
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ifdef CONFIG_MIPS32_N32
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@echo ' Checking missing-syscalls for N32'
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$(Q)$(MAKE) $(build)=. missing-syscalls missing_syscalls_flags="-mabi=n32"
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endif
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ifdef CONFIG_MIPS32_O32
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@echo ' Checking missing-syscalls for O32'
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$(Q)$(MAKE) $(build)=. missing-syscalls missing_syscalls_flags="-mabi=32"
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endif
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install:
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$(Q)install -D -m 755 vmlinux $(INSTALL_PATH)/vmlinux-$(KERNELRELEASE)
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ifdef CONFIG_SYS_SUPPORTS_ZBOOT
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$(Q)install -D -m 755 vmlinuz $(INSTALL_PATH)/vmlinuz-$(KERNELRELEASE)
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endif
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$(Q)install -D -m 644 .config $(INSTALL_PATH)/config-$(KERNELRELEASE)
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$(Q)install -D -m 644 System.map $(INSTALL_PATH)/System.map-$(KERNELRELEASE)
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archclean:
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$(Q)$(MAKE) $(clean)=arch/mips/boot
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$(Q)$(MAKE) $(clean)=arch/mips/boot/compressed
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$(Q)$(MAKE) $(clean)=arch/mips/lasat
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define archhelp
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echo ' install - install kernel into $(INSTALL_PATH)'
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echo ' vmlinux.ecoff - ECOFF boot image'
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echo ' vmlinux.bin - Raw binary boot image'
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echo ' vmlinux.srec - SREC boot image'
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echo ' vmlinux.32 - 64-bit boot image wrapped in 32bits (IP22/IP32)'
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echo ' vmlinuz - Compressed boot(zboot) image'
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echo ' vmlinuz.ecoff - ECOFF zboot image'
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echo ' vmlinuz.bin - Raw binary zboot image'
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echo ' vmlinuz.srec - SREC zboot image'
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echo ' uImage - U-Boot image'
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echo ' uImage.bin - U-Boot image (uncompressed)'
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echo ' uImage.bz2 - U-Boot image (bz2)'
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echo ' uImage.gz - U-Boot image (gzip)'
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echo ' uImage.lzma - U-Boot image (lzma)'
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echo ' uImage.lzo - U-Boot image (lzo)'
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echo ' dtbs - Device-tree blobs for enabled boards'
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echo ' dtbs_install - Install dtbs to $(INSTALL_DTBS_PATH)'
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echo
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echo ' These will be default as appropriate for a configured platform.'
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endef
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