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 ($(CONFIG_OMAP_COMMON),)
  12 CONFIG_STANDALONE_LOAD_ADDR = 0x80300000
  13 else
  14 CONFIG_STANDALONE_LOAD_ADDR = 0xc100000
  15 endif
  16 endif
  17
  18 LDFLAGS_FINAL += --gc-sections
  19 PLATFORM_RELFLAGS += -ffunction-sections -fdata-sections \
  20                      -fno-common -ffixed-r9 -msoft-float
  21
  22 # Support generic board on ARM
  23 __HAVE_ARCH_GENERIC_BOARD := y
  24
  25 PLATFORM_CPPFLAGS += -DCONFIG_ARM -D__ARM__
  26
  27 # Choose between ARM/Thumb instruction sets
  28 ifeq ($(CONFIG_SYS_THUMB_BUILD),y)
  29 PF_CPPFLAGS_ARM := $(call cc-option, -mthumb -mthumb-interwork,\
  30                         $(call cc-option,-marm,)\
  31                         $(call cc-option,-mno-thumb-interwork,)\
  32                 )
  33 else
  34 PF_CPPFLAGS_ARM := $(call cc-option,-marm,) \
  35                 $(call cc-option,-mno-thumb-interwork,)
  36 endif
  37
  38 # Only test once
  39 ifneq ($(CONFIG_SPL_BUILD),y)
  40 ALL-$(CONFIG_SYS_THUMB_BUILD)   += checkthumb
  41 endif
  42
  43 # Try if EABI is supported, else fall back to old API,
  44 # i. e. for example:
  45 # - with ELDK 4.2 (EABI supported), use:
  46 #       -mabi=aapcs-linux
  47 # - with ELDK 4.1 (gcc 4.x, no EABI), use:
  48 #       -mabi=apcs-gnu
  49 # - with ELDK 3.1 (gcc 3.x), use:
  50 #       -mapcs-32
  51 PF_CPPFLAGS_ABI := $(call cc-option,\
  52                         -mabi=aapcs-linux,\
  53                         $(call cc-option,\
  54                                 -mapcs-32,\
  55                                 $(call cc-option,\
  56                                         -mabi=apcs-gnu,\
  57                                 )\
  58                         )\
  59                 )
  60 PLATFORM_CPPFLAGS += $(PF_CPPFLAGS_ARM) $(PF_CPPFLAGS_ABI)
  61
  62 # For EABI, make sure to provide raise()
  63 ifneq (,$(findstring -mabi=aapcs-linux,$(PLATFORM_CPPFLAGS)))
  64 # This file is parsed many times, so the string may get added multiple
  65 # times. Also, the prefix needs to be different based on whether
  66 # CONFIG_SPL_BUILD is defined or not. 'filter-out' the existing entry
  67 # before adding the correct one.
  68 ifdef CONFIG_SPL_BUILD
  69 PLATFORM_LIBS := $(SPLTREE)/arch/arm/lib/eabi_compat.o \
  70         $(filter-out %/arch/arm/lib/eabi_compat.o, $(PLATFORM_LIBS))
  71 else
  72 PLATFORM_LIBS := $(OBJTREE)/arch/arm/lib/eabi_compat.o \
  73         $(filter-out %/arch/arm/lib/eabi_compat.o, $(PLATFORM_LIBS))
  74 endif
  75 endif
  76
  77 # needed for relocation
  78 LDFLAGS_u-boot += -pie
  79
  80 #
  81 # FIXME: binutils versions < 2.22 have a bug in the assembler where
  82 # branches to weak symbols can be incorrectly optimized in thumb mode
  83 # to a short branch (b.n instruction) that won't reach when the symbol
  84 # gets preempted
  85 #
  86 # http://sourceware.org/bugzilla/show_bug.cgi?id=12532
  87 #
  88 ifeq ($(CONFIG_SYS_THUMB_BUILD),y)
  89 ifeq ($(GAS_BUG_12532),)
  90 export GAS_BUG_12532:=$(shell if [ $(call binutils-version) -lt 0222 ] ; \
  91         then echo y; else echo n; fi)
  92 endif
  93 ifeq ($(GAS_BUG_12532),y)
  94 PLATFORM_RELFLAGS += -fno-optimize-sibling-calls
  95 endif
  96 endif
  97
  98 ifneq ($(CONFIG_SPL_BUILD),y)
  99 # Check that only R_ARM_RELATIVE relocations are generated.
 100 ALL-y += checkarmreloc
 101 # The movt / movw can hardcode 16 bit parts of the addresses in the
 102 # instruction. Relocation is not supported for that case, so disable
 103 # such usage by requiring word relocations.
 104 PLATFORM_CPPFLAGS += $(call cc-option, -mword-relocations)
 105 endif