2 # Copyright (C) 2004, 2007-2010, 2011-2012 Synopsys, Inc. (www.synopsys.com)
4 # This program is free software; you can redistribute it and/or modify
5 # it under the terms of the GNU General Public License version 2 as
6 # published by the Free Software Foundation.
11 KBUILD_DEFCONFIG := fpga_defconfig
13 # For ARC FPGA Platforms
14 platform-$(CONFIG_ARC_PLAT_FPGA_LEGACY) := arcfpga
15 #New platform adds here
17 PLATFORM := $(platform-y)
20 cflags-y += -Iarch/arc/plat-$(PLATFORM)/include
21 cflags-y += -mA7 -fno-common -pipe -fno-builtin -D__linux__
23 ifdef CONFIG_ARC_CURR_IN_REG
24 # For a global register defintion, make sure it gets passed to every file
25 # We had a customer reported bug where some code built in kernel was NOT using
26 # any kernel headers, and missing the r25 global register
27 # Can't do unconditionally (like above) because of recursive include issues
28 # due to <linux/thread_info.h>
29 LINUXINCLUDE += -include ${src}/arch/arc/include/asm/current.h
32 atleast_gcc44 := $(call cc-ifversion, -gt, 0402, y)
33 cflags-$(atleast_gcc44) += -fsection-anchors
35 cflags-$(CONFIG_ARC_HAS_LLSC) += -mlock
36 cflags-$(CONFIG_ARC_HAS_SWAPE) += -mswape
37 cflags-$(CONFIG_ARC_HAS_RTSC) += -mrtsc
38 cflags-$(CONFIG_ARC_DW2_UNWIND) += -fasynchronous-unwind-tables
40 ifndef CONFIG_CC_OPTIMIZE_FOR_SIZE
41 # Generic build system uses -O2, we want -O3
45 # small data is default for elf32 tool-chain. If not usable, disable it
46 # This also allows repurposing GP as scratch reg to gcc reg allocator
47 disable_small_data := y
48 cflags-$(disable_small_data) += -mno-sdata -fcall-used-gp
50 cflags-$(CONFIG_CPU_BIG_ENDIAN) += -mbig-endian
51 ldflags-$(CONFIG_CPU_BIG_ENDIAN) += -EB
54 # arc-linux-uclibc-ld (buildroot) or arceb-elf32-ld (EZChip) don't accept
55 # --build-id w/o "-marclinux".
56 # Default arc-elf32-ld is OK
57 ldflags-y += -marclinux
60 cflags-$(CONFIG_ARC_HAS_HW_MPY) += -multcost=16
62 ifndef CONFIG_ARC_HAS_HW_MPY
65 # newlib for ARC700 assumes MPY to be always present, which is generally true
66 # However, if someone really doesn't want MPY, we need to use the 600 ver
67 # which coupled with -mno-mpy will use mpy emulation
68 # With gcc 4.4.7, -mno-mpy is enough to make any other related adjustments,
69 # e.g. increased cost of MPY. With gcc 4.2.1 this had to be explicitly hinted
71 ARC_LIBGCC := -marc600
72 ifneq ($(atleast_gcc44),y)
73 cflags-y += -multcost=30
77 LIBGCC := $(shell $(CC) $(ARC_LIBGCC) $(cflags-y) --print-libgcc-file-name)
79 # Modules with short calls might break for calls into builtin-kernel
80 KBUILD_CFLAGS_MODULE += -mlong-calls
82 # Finally dump eveything into kernel build system
83 KBUILD_CFLAGS += $(cflags-y)
84 KBUILD_AFLAGS += $(KBUILD_CFLAGS)
85 LDFLAGS += $(ldflags-y)
87 # Needed for Linker script preprocessing
88 KBUILD_CPPFLAGS += -Iarch/arc/plat-$(PLATFORM)/include
90 head-y := arch/arc/kernel/head.o
92 # See arch/arc/Kbuild for content of core part of the kernel
95 # w/o this dtb won't embed into kernel binary
96 core-y += arch/arc/boot/dts/
98 # w/o this ifneq, make ARCH=arc clean was crapping out
99 ifneq ($(platform-y),)
100 core-y += arch/arc/plat-$(PLATFORM)/
103 drivers-$(CONFIG_OPROFILE) += arch/arc/oprofile/
105 libs-y += arch/arc/lib/ $(LIBGCC)
107 #default target for make without any arguements.
108 KBUILD_IMAGE := bootpImage
111 boot := arch/arc/boot
116 $(Q)$(MAKE) $(build)=$(boot) $(boot)/$@
118 %.dtb %.dtb.S %.dtb.o: scripts
119 $(Q)$(MAKE) $(build)=$(boot)/dts $(boot)/dts/$@
122 $(Q)$(MAKE) $(build)=$(boot)/dts dtbs
125 $(Q)$(MAKE) $(clean)=$(boot)
127 # Hacks to enable final link due to absence of link-time branch relexation
128 # and gcc choosing optimal(shorter) branches at -O3
130 # vineetg Feb 2010: -mlong-calls switched off for overall kernel build
131 # However lib/decompress_inflate.o (.init.text) calls
132 # zlib_inflate_workspacesize (.text) causing relocation errors.
133 # Thus forcing all exten calls in this file to be long calls
134 export CFLAGS_decompress_inflate.o = -mmedium-calls
135 export CFLAGS_initramfs.o = -mmedium-calls
137 export CFLAGS_core.o = -mmedium-calls