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
  21 PLATFORM_RELFLAGS += $(call cc-option, -msoft-float) \
  22       $(call cc-option,-mshort-load-bytes,$(call cc-option,-malignment-traps,))
  23
  24 # Support generic board on ARM
  25 __HAVE_ARCH_GENERIC_BOARD := y
  26
  27 PLATFORM_CPPFLAGS += -DCONFIG_ARM -D__ARM__
  28
  29 # Choose between ARM/Thumb instruction sets
  30 ifeq ($(CONFIG_SYS_THUMB_BUILD),y)
  31 PF_CPPFLAGS_ARM := $(call cc-option, -mthumb -mthumb-interwork,\
  32                         $(call cc-option,-marm,)\
  33                         $(call cc-option,-mno-thumb-interwork,)\
  34                 )
  35 else
  36 PF_CPPFLAGS_ARM := $(call cc-option,-marm,) \
  37                 $(call cc-option,-mno-thumb-interwork,)
  38 endif
  39
  40 # Only test once
  41 ifneq ($(CONFIG_SPL_BUILD),y)
  42 ALL-$(CONFIG_SYS_THUMB_BUILD)   += checkthumb
  43 endif
  44
  45 # Try if EABI is supported, else fall back to old API,
  46 # i. e. for example:
  47 # - with ELDK 4.2 (EABI supported), use:
  48 #       -mabi=aapcs-linux
  49 # - with ELDK 4.1 (gcc 4.x, no EABI), use:
  50 #       -mabi=apcs-gnu
  51 # - with ELDK 3.1 (gcc 3.x), use:
  52 #       -mapcs-32
  53 PF_CPPFLAGS_ABI := $(call cc-option,\
  54                         -mabi=aapcs-linux,\
  55                         $(call cc-option,\
  56                                 -mapcs-32,\
  57                                 $(call cc-option,\
  58                                         -mabi=apcs-gnu,\
  59                                 )\
  60                         )\
  61                 )
  62 PLATFORM_CPPFLAGS += $(PF_CPPFLAGS_ARM) $(PF_CPPFLAGS_ABI)
  63
  64 # For EABI, make sure to provide raise()
  65 ifneq (,$(findstring -mabi=aapcs-linux,$(PLATFORM_CPPFLAGS)))
  66 # This file is parsed many times, so the string may get added multiple
  67 # times. Also, the prefix needs to be different based on whether
  68 # CONFIG_SPL_BUILD is defined or not. 'filter-out' the existing entry
  69 # before adding the correct one.
  70 ifdef CONFIG_SPL_BUILD
  71 PLATFORM_LIBS := $(SPLTREE)/arch/arm/lib/eabi_compat.o \
  72         $(filter-out %/arch/arm/lib/eabi_compat.o, $(PLATFORM_LIBS))
  73 else
  74 PLATFORM_LIBS := $(OBJTREE)/arch/arm/lib/eabi_compat.o \
  75         $(filter-out %/arch/arm/lib/eabi_compat.o, $(PLATFORM_LIBS))
  76 endif
  77 endif
  78
  79 # needed for relocation
  80 LDFLAGS_u-boot += -pie
  81
  82 #
  83 # FIXME: binutils versions < 2.22 have a bug in the assembler where
  84 # branches to weak symbols can be incorrectly optimized in thumb mode
  85 # to a short branch (b.n instruction) that won't reach when the symbol
  86 # gets preempted
  87 #
  88 # http://sourceware.org/bugzilla/show_bug.cgi?id=12532
  89 #
  90 ifeq ($(CONFIG_SYS_THUMB_BUILD),y)
  91 ifeq ($(GAS_BUG_12532),)
  92 export GAS_BUG_12532:=$(shell if [ $(call binutils-version) -lt 0222 ] ; \
  93         then echo y; else echo n; fi)
  94 endif
  95 ifeq ($(GAS_BUG_12532),y)
  96 PLATFORM_RELFLAGS += -fno-optimize-sibling-calls
  97 endif
  98 endif
  99
 100 ifneq ($(CONFIG_SPL_BUILD),y)
 101 # Check that only R_ARM_RELATIVE relocations are generated.
 102 ALL-y += checkarmreloc
 103 # The movt / movw can hardcode 16 bit parts of the addresses in the
 104 # instruction. Relocation is not supported for that case, so disable
 105 # such usage by requiring word relocations.
 106 PLATFORM_CPPFLAGS += $(call cc-option, -mword-relocations)
 107 endif
 108
 109 # limit ourselves to the sections we want in the .bin.
 110 ifdef CONFIG_ARM64
 111 OBJCOPYFLAGS += -j .text -j .rodata -j .data -j .u_boot_list -j .rela.dyn
 112 else
 113 OBJCOPYFLAGS += -j .text -j .rodata -j .hash -j .data -j .got.plt -j .u_boot_list -j .rel.dyn
 114 endif
 115
 116 ifneq ($(CONFIG_IMX_CONFIG),)
 117 ifdef CONFIG_SPL
 118 ifndef CONFIG_SPL_BUILD
 119 ALL-y += SPL
 120 endif
 121 else
 122 ALL-y += u-boot.imx
 123 endif
 124 endif