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 ifeq ($(CROSS_COMPILE),)
   9 CROSS_COMPILE := arm-linux-
  10 endif
  11
  12 ifndef CONFIG_STANDALONE_LOAD_ADDR
  13 ifneq ($(CONFIG_OMAP_COMMON),)
  14 CONFIG_STANDALONE_LOAD_ADDR = 0x80300000
  15 else
  16 CONFIG_STANDALONE_LOAD_ADDR = 0xc100000
  17 endif
  18 endif
  19
  20 LDFLAGS_FINAL += --gc-sections
  21 PLATFORM_RELFLAGS += -ffunction-sections -fdata-sections \
  22                      -fno-common -ffixed-r9
  23 PLATFORM_RELFLAGS += $(call cc-option, -msoft-float) \
  24       $(call cc-option,-mshort-load-bytes,$(call cc-option,-malignment-traps,))
  25
  26 # Support generic board on ARM
  27 __HAVE_ARCH_GENERIC_BOARD := y
  28
  29 PLATFORM_CPPFLAGS += -DCONFIG_ARM -D__ARM__
  30
  31 # Choose between ARM/Thumb instruction sets
  32 ifeq ($(CONFIG_SYS_THUMB_BUILD),y)
  33 PF_CPPFLAGS_ARM := $(call cc-option, -mthumb -mthumb-interwork,\
  34                         $(call cc-option,-marm,)\
  35                         $(call cc-option,-mno-thumb-interwork,)\
  36                 )
  37 else
  38 PF_CPPFLAGS_ARM := $(call cc-option,-marm,) \
  39                 $(call cc-option,-mno-thumb-interwork,)
  40 endif
  41
  42 # Only test once
  43 ifneq ($(CONFIG_SPL_BUILD),y)
  44 ALL-$(CONFIG_SYS_THUMB_BUILD)   += checkthumb
  45 endif
  46
  47 # Try if EABI is supported, else fall back to old API,
  48 # i. e. for example:
  49 # - with ELDK 4.2 (EABI supported), use:
  50 #       -mabi=aapcs-linux
  51 # - with ELDK 4.1 (gcc 4.x, no EABI), use:
  52 #       -mabi=apcs-gnu
  53 # - with ELDK 3.1 (gcc 3.x), use:
  54 #       -mapcs-32
  55 PF_CPPFLAGS_ABI := $(call cc-option,\
  56                         -mabi=aapcs-linux,\
  57                         $(call cc-option,\
  58                                 -mapcs-32,\
  59                                 $(call cc-option,\
  60                                         -mabi=apcs-gnu,\
  61                                 )\
  62                         )\
  63                 )
  64 PLATFORM_CPPFLAGS += $(PF_CPPFLAGS_ARM) $(PF_CPPFLAGS_ABI)
  65
  66 # For EABI, make sure to provide raise()
  67 ifneq (,$(findstring -mabi=aapcs-linux,$(PLATFORM_CPPFLAGS)))
  68 # This file is parsed many times, so the string may get added multiple
  69 # times. Also, the prefix needs to be different based on whether
  70 # CONFIG_SPL_BUILD is defined or not. 'filter-out' the existing entry
  71 # before adding the correct one.
  72 PLATFORM_LIBS := arch/arm/lib/eabi_compat.o \
  73         $(filter-out arch/arm/lib/eabi_compat.o, $(PLATFORM_LIBS))
  74 endif
  75
  76 # needed for relocation
  77 LDFLAGS_u-boot += -pie
  78
  79 #
  80 # FIXME: binutils versions < 2.22 have a bug in the assembler where
  81 # branches to weak symbols can be incorrectly optimized in thumb mode
  82 # to a short branch (b.n instruction) that won't reach when the symbol
  83 # gets preempted
  84 #
  85 # http://sourceware.org/bugzilla/show_bug.cgi?id=12532
  86 #
  87 ifeq ($(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 ifneq ($(CONFIG_SPL_BUILD),y)
  98 # Check that only R_ARM_RELATIVE relocations are generated.
  99 ALL-y += checkarmreloc
 100 # The movt / movw can hardcode 16 bit parts of the addresses in the
 101 # instruction. Relocation is not supported for that case, so disable
 102 # such usage by requiring word relocations.
 103 PLATFORM_CPPFLAGS += $(call cc-option, -mword-relocations)
 104 endif
 105
 106 # limit ourselves to the sections we want in the .bin.
 107 ifdef CONFIG_ARM64
 108 OBJCOPYFLAGS += -j .text -j .rodata -j .data -j .u_boot_list -j .rela.dyn
 109 else
 110 OBJCOPYFLAGS += -j .text -j .rodata -j .hash -j .data -j .got.plt -j .u_boot_list -j .rel.dyn
 111 endif
 112
 113 ifneq ($(CONFIG_IMX_CONFIG),)
 114 ifdef CONFIG_SPL
 115 ifndef CONFIG_SPL_BUILD
 116 ALL-y += SPL
 117 endif
 118 else
 119 ALL-y += u-boot.imx
 120 endif
 121 endif