config.mk

   1 #
   2 # (C) Copyright 2000-2006
   3 # Wolfgang Denk, DENX Software Engineering, wd@denx.de.
   4 #
   5 # See file CREDITS for list of people who contributed to this
   6 # project.
   7 #
   8 # This program is free software; you can redistribute it and/or
   9 # modify it under the terms of the GNU General Public License as
  10 # published by the Free Software Foundation; either version 2 of
  11 # the License, or (at your option) any later version.
  12 #
  13 # This program is distributed in the hope that it will be useful,
  14 # but WITHOUT ANY WARRANTY; without even the implied warranty of
  15 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16 # GNU General Public License for more details.
  17 #
  18 # You should have received a copy of the GNU General Public License
  19 # along with this program; if not, write to the Free Software
  20 # Foundation, Inc., 59 Temple Place, Suite 330, Boston,
  21 # MA 02111-1307 USA
  22 #
  23
  24 #########################################################################
  25
  26 ifneq ($(OBJTREE),$(SRCTREE))
  27 ifeq ($(CURDIR),$(SRCTREE))
  28 dir :=
  29 else
  30 dir := $(subst $(SRCTREE)/,,$(CURDIR))
  31 endif
  32
  33 obj := $(if $(dir),$(OBJTREE)/$(dir)/,$(OBJTREE)/)
  34 src := $(if $(dir),$(SRCTREE)/$(dir)/,$(SRCTREE)/)
  35
  36 $(shell mkdir -p $(obj))
  37 else
  38 obj :=
  39 src :=
  40 endif
  41
  42 # clean the slate ...
  43 PLATFORM_RELFLAGS =
  44 PLATFORM_CPPFLAGS =
  45 PLATFORM_LDFLAGS =
  46
  47 #########################################################################
  48
  49 ifeq ($(HOSTOS),darwin)
  50 HOSTCC          = cc
  51 else
  52 HOSTCC          = gcc
  53 endif
  54 HOSTCFLAGS      = -Wall -Wstrict-prototypes -O2 -fomit-frame-pointer
  55 HOSTSTRIP       = strip
  56
  57 #########################################################################
  58 #
  59 # Option checker (courtesy linux kernel) to ensure
  60 # only supported compiler options are used
  61 #
  62 cc-option = $(shell if $(CC) $(CFLAGS) $(1) -S -o /dev/null -xc /dev/null \
  63                 > /dev/null 2>&1; then echo "$(1)"; else echo "$(2)"; fi ;)
  64
  65 #
  66 # Include the make variables (CC, etc...)
  67 #
  68 AS      = $(CROSS_COMPILE)as
  69 LD      = $(CROSS_COMPILE)ld
  70 CC      = $(CROSS_COMPILE)gcc
  71 CPP     = $(CC) -E
  72 AR      = $(CROSS_COMPILE)ar
  73 NM      = $(CROSS_COMPILE)nm
  74 LDR     = $(CROSS_COMPILE)ldr
  75 STRIP   = $(CROSS_COMPILE)strip
  76 OBJCOPY = $(CROSS_COMPILE)objcopy
  77 OBJDUMP = $(CROSS_COMPILE)objdump
  78 RANLIB  = $(CROSS_COMPILE)RANLIB
  79
  80 #########################################################################
  81
  82 # Load generated board configuration
  83 sinclude $(OBJTREE)/include/autoconf.mk
  84
  85 ifdef   ARCH
  86 sinclude $(TOPDIR)/lib_$(ARCH)/config.mk        # include architecture dependend rules
  87 endif
  88 ifdef   CPU
  89 sinclude $(TOPDIR)/cpu/$(CPU)/config.mk # include  CPU  specific rules
  90 endif
  91 ifdef   SOC
  92 sinclude $(TOPDIR)/cpu/$(CPU)/$(SOC)/config.mk  # include  SoC  specific rules
  93 endif
  94 ifdef   VENDOR
  95 BOARDDIR = $(VENDOR)/$(BOARD)
  96 else
  97 BOARDDIR = $(BOARD)
  98 endif
  99 ifdef   BOARD
 100 sinclude $(TOPDIR)/board/$(BOARDDIR)/config.mk  # include board specific rules
 101 endif
 102
 103 #########################################################################
 104
 105 ifneq (,$(findstring s,$(MAKEFLAGS)))
 106 ARFLAGS = cr
 107 else
 108 ARFLAGS = crv
 109 endif
 110 RELFLAGS= $(PLATFORM_RELFLAGS)
 111 DBGFLAGS= -g # -DDEBUG
 112 OPTFLAGS= -Os #-fomit-frame-pointer
 113 ifndef LDSCRIPT
 114 #LDSCRIPT := $(TOPDIR)/board/$(BOARDDIR)/u-boot.lds.debug
 115 ifeq ($(CONFIG_NAND_U_BOOT),y)
 116 LDSCRIPT := $(TOPDIR)/board/$(BOARDDIR)/u-boot-nand.lds
 117 else
 118 LDSCRIPT := $(TOPDIR)/board/$(BOARDDIR)/u-boot.lds
 119 endif
 120 endif
 121 OBJCFLAGS += --gap-fill=0xff
 122
 123 gccincdir := $(shell $(CC) -print-file-name=include)
 124
 125 CPPFLAGS := $(DBGFLAGS) $(OPTFLAGS) $(RELFLAGS)         \
 126         -D__KERNEL__
 127 ifneq ($(TEXT_BASE),)
 128 CPPFLAGS += -DTEXT_BASE=$(TEXT_BASE)
 129 endif
 130
 131 ifneq ($(OBJTREE),$(SRCTREE))
 132 CPPFLAGS += -I$(OBJTREE)/include2 -I$(OBJTREE)/include
 133 endif
 134
 135 CPPFLAGS += -I$(TOPDIR)/include
 136 CPPFLAGS += -fno-builtin -ffreestanding -nostdinc       \
 137         -isystem $(gccincdir) -pipe $(PLATFORM_CPPFLAGS)
 138
 139 ifdef BUILD_TAG
 140 CFLAGS := $(CPPFLAGS) -Wall -Wstrict-prototypes \
 141         -DBUILD_TAG='"$(BUILD_TAG)"'
 142 else
 143 CFLAGS := $(CPPFLAGS) -Wall -Wstrict-prototypes
 144 endif
 145
 146 CFLAGS += $(call cc-option,-fno-stack-protector)
 147
 148 # avoid trigraph warnings while parsing pci.h (produced by NIOS gcc-2.9)
 149 # this option have to be placed behind -Wall -- that's why it is here
 150 ifeq ($(ARCH),nios)
 151 ifeq ($(findstring 2.9,$(shell $(CC) --version)),2.9)
 152 CFLAGS := $(CPPFLAGS) -Wall -Wno-trigraphs
 153 endif
 154 endif
 155
 156 # $(CPPFLAGS) sets -g, which causes gcc to pass a suitable -g<format>
 157 # option to the assembler.
 158 AFLAGS_DEBUG :=
 159
 160 # turn jbsr into jsr for m68k
 161 ifeq ($(ARCH),m68k)
 162 ifeq ($(findstring 3.4,$(shell $(CC) --version)),3.4)
 163 AFLAGS_DEBUG := -Wa,-gstabs,-S
 164 endif
 165 endif
 166
 167 AFLAGS := $(AFLAGS_DEBUG) -D__ASSEMBLY__ $(CPPFLAGS)
 168
 169 LDFLAGS += -Bstatic -T $(LDSCRIPT) $(PLATFORM_LDFLAGS)
 170 ifneq ($(TEXT_BASE),)
 171 LDFLAGS += -Ttext $(TEXT_BASE)
 172 endif
 173
 174 # Location of a usable BFD library, where we define "usable" as
 175 # "built for ${HOST}, supports ${TARGET}".  Sensible values are
 176 # - When cross-compiling: the root of the cross-environment
 177 # - Linux/ppc (native): /usr
 178 # - NetBSD/ppc (native): you lose ... (must extract these from the
 179 #   binutils build directory, plus the native and U-Boot include
 180 #   files don't like each other)
 181 #
 182 # So far, this is used only by tools/gdb/Makefile.
 183
 184 ifeq ($(HOSTOS),darwin)
 185 BFD_ROOT_DIR =          /usr/local/tools
 186 else
 187 ifeq ($(HOSTARCH),$(ARCH))
 188 # native
 189 BFD_ROOT_DIR =          /usr
 190 else
 191 #BFD_ROOT_DIR =         /LinuxPPC/CDK           # Linux/i386
 192 #BFD_ROOT_DIR =         /usr/pkg/cross          # NetBSD/i386
 193 BFD_ROOT_DIR =          /opt/powerpc
 194 endif
 195 endif
 196
 197 #########################################################################
 198
 199 export  HOSTCC HOSTCFLAGS CROSS_COMPILE \
 200         AS LD CC CPP AR NM STRIP OBJCOPY OBJDUMP MAKE
 201 export  TEXT_BASE PLATFORM_CPPFLAGS PLATFORM_RELFLAGS CPPFLAGS CFLAGS AFLAGS
 202
 203 #########################################################################
 204
 205 # Allow boards to use custom optimize flags on a per dir/file basis
 206 BCURDIR := $(notdir $(CURDIR))
 207 $(obj)%.s:      %.S
 208         $(CPP) $(AFLAGS) $(AFLAGS_$(@F)) $(AFLAGS_$(BCURDIR)) -o $@ $<
 209 $(obj)%.o:      %.S
 210         $(CC)  $(AFLAGS) $(AFLAGS_$(@F)) $(AFLAGS_$(BCURDIR)) -o $@ $< -c
 211 $(obj)%.o:      %.c
 212         $(CC)  $(CFLAGS) $(CFLAGS_$(@F)) $(CFLAGS_$(BCURDIR)) -o $@ $< -c
 213 $(obj)%.i:      %.c
 214         $(CPP) $(CFLAGS) $(CFLAGS_$(@F)) $(CFLAGS_$(BCURDIR)) -o $@ $< -c
 215 $(obj)%.s:      %.c
 216         $(CC)  $(CFLAGS) $(CFLAGS_$(@F)) $(CFLAGS_$(BCURDIR)) -o $@ $< -c -S
 217
 218 #########################################################################