arch/arm/config.mk

   1 #
   2 # (C) Copyright 2000-2002
   3 # Wolfgang Denk, DENX Software Engineering, wd@denx.de.
   4 #
   5 # SPDX-License-Identifier:      GPL-2.0+
   6 #
   7
   8 CROSS_COMPILE ?= arm-linux-
   9
  10 ifndef CONFIG_STANDALONE_LOAD_ADDR
  11 ifneq ($(CONFIG_AM33XX)$(CONFIG_OMAP34XX)$(CONFIG_OMAP44XX)$(CONFIG_OMAP54XX)$(CONFIG_TI814X),)
  12 CONFIG_STANDALONE_LOAD_ADDR = 0x80300000
  13 else
  14 CONFIG_STANDALONE_LOAD_ADDR = 0xc100000
  15 endif
  16 endif
  17
  18 LDFLAGS_FINAL += --gc-sections
  19 PLATFORM_RELFLAGS += -ffunction-sections -fdata-sections
  20
  21 # Support generic board on ARM
  22 __HAVE_ARCH_GENERIC_BOARD := y
  23
  24 PLATFORM_CPPFLAGS += -DCONFIG_ARM -D__ARM__
  25
  26 # Choose between ARM/Thumb instruction sets
  27 ifeq ($(CONFIG_SYS_THUMB_BUILD),y)
  28 PF_CPPFLAGS_ARM := $(call cc-option, -mthumb -mthumb-interwork,\
  29                         $(call cc-option,-marm,)\
  30                         $(call cc-option,-mno-thumb-interwork,)\
  31                 )
  32 else
  33 PF_CPPFLAGS_ARM := $(call cc-option,-marm,) \
  34                 $(call cc-option,-mno-thumb-interwork,)
  35 endif
  36
  37 # Only test once
  38 ifneq ($(CONFIG_SPL_BUILD),y)
  39 ALL-$(CONFIG_SYS_THUMB_BUILD)   += checkthumb
  40 endif
  41
  42 # Try if EABI is supported, else fall back to old API,
  43 # i. e. for example:
  44 # - with ELDK 4.2 (EABI supported), use:
  45 #       -mabi=aapcs-linux
  46 # - with ELDK 4.1 (gcc 4.x, no EABI), use:
  47 #       -mabi=apcs-gnu
  48 # - with ELDK 3.1 (gcc 3.x), use:
  49 #       -mapcs-32
  50 PF_CPPFLAGS_ABI := $(call cc-option,\
  51                         -mabi=aapcs-linux,\
  52                         $(call cc-option,\
  53                                 -mapcs-32,\
  54                                 $(call cc-option,\
  55                                         -mabi=apcs-gnu,\
  56                                 )\
  57                         )\
  58                 )
  59 PLATFORM_CPPFLAGS += $(PF_CPPFLAGS_ARM) $(PF_CPPFLAGS_ABI)
  60
  61 # For EABI, make sure to provide raise()
  62 ifneq (,$(findstring -mabi=aapcs-linux,$(PLATFORM_CPPFLAGS)))
  63 # This file is parsed many times, so the string may get added multiple
  64 # times. Also, the prefix needs to be different based on whether
  65 # CONFIG_SPL_BUILD is defined or not. 'filter-out' the existing entry
  66 # before adding the correct one.
  67 ifdef CONFIG_SPL_BUILD
  68 PLATFORM_LIBS := $(SPLTREE)/arch/arm/lib/eabi_compat.o \
  69         $(filter-out %/arch/arm/lib/eabi_compat.o, $(PLATFORM_LIBS))
  70 else
  71 PLATFORM_LIBS := $(OBJTREE)/arch/arm/lib/eabi_compat.o \
  72         $(filter-out %/arch/arm/lib/eabi_compat.o, $(PLATFORM_LIBS))
  73 endif
  74 endif
  75
  76 # needed for relocation
  77 LDFLAGS_u-boot += -pie
  78
  79 #
  80 # FIXME: binutils versions < 2.22 have a bug in the assembler where
  81 # branches to weak symbols can be incorrectly optimized in thumb mode
  82 # to a short branch (b.n instruction) that won't reach when the symbol
  83 # gets preempted
  84 #
  85 # http://sourceware.org/bugzilla/show_bug.cgi?id=12532
  86 #
  87 ifeq ($(CONFIG_SYS_THUMB_BUILD),y)
  88 ifeq ($(GAS_BUG_12532),)
  89 export GAS_BUG_12532:=$(shell if [ $(call binutils-version) -lt 0222 ] ; \
  90         then echo y; else echo n; fi)
  91 endif
  92 ifeq ($(GAS_BUG_12532),y)
  93 PLATFORM_RELFLAGS += -fno-optimize-sibling-calls
  94 endif
  95 endif
  96
  97 # check that only R_ARM_RELATIVE relocations are generated
  98 ifneq ($(CONFIG_SPL_BUILD),y)
  99 ALL-y   += checkarmreloc
 100 endif