xref: /openbmc/u-boot/arch/arm/config.mk (revision 83bf0057)
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
8ifndef CONFIG_STANDALONE_LOAD_ADDR
9ifneq ($(CONFIG_OMAP_COMMON),)
10CONFIG_STANDALONE_LOAD_ADDR = 0x80300000
11else
12CONFIG_STANDALONE_LOAD_ADDR = 0xc100000
13endif
14endif
15
16LDFLAGS_FINAL += --gc-sections
17PLATFORM_RELFLAGS += -ffunction-sections -fdata-sections \
18		     -fno-common -ffixed-r9
19PLATFORM_RELFLAGS += $(call cc-option, -msoft-float) \
20      $(call cc-option,-mshort-load-bytes,$(call cc-option,-malignment-traps,))
21
22PLATFORM_CPPFLAGS += -D__ARM__
23
24# Choose between ARM/Thumb instruction sets
25ifeq ($(CONFIG_SYS_THUMB_BUILD),y)
26AFLAGS_IMPLICIT_IT	:= $(call as-option,-Wa$(comma)-mimplicit-it=always)
27PF_CPPFLAGS_ARM		:= $(AFLAGS_IMPLICIT_IT) \
28			$(call cc-option, -mthumb -mthumb-interwork,\
29			$(call cc-option,-marm,)\
30			$(call cc-option,-mno-thumb-interwork,)\
31		)
32else
33PF_CPPFLAGS_ARM := $(call cc-option,-marm,) \
34		$(call cc-option,-mno-thumb-interwork,)
35endif
36
37# Only test once
38ifneq ($(CONFIG_SPL_BUILD),y)
39ifeq ($(CONFIG_SYS_THUMB_BUILD),y)
40archprepare: checkthumb
41
42checkthumb:
43	@if test "$(call cc-version)" -lt "0404"; then \
44		echo -n '*** Your GCC does not produce working '; \
45		echo 'binaries in THUMB mode.'; \
46		echo '*** Your board is configured for THUMB mode.'; \
47		false; \
48	fi
49endif
50endif
51
52# Try if EABI is supported, else fall back to old API,
53# i. e. for example:
54# - with ELDK 4.2 (EABI supported), use:
55#	-mabi=aapcs-linux
56# - with ELDK 4.1 (gcc 4.x, no EABI), use:
57#	-mabi=apcs-gnu
58# - with ELDK 3.1 (gcc 3.x), use:
59#	-mapcs-32
60PF_CPPFLAGS_ABI := $(call cc-option,\
61			-mabi=aapcs-linux,\
62			$(call cc-option,\
63				-mapcs-32,\
64				$(call cc-option,\
65					-mabi=apcs-gnu,\
66				)\
67			)\
68		)
69PLATFORM_CPPFLAGS += $(PF_CPPFLAGS_ARM) $(PF_CPPFLAGS_ABI)
70
71# For EABI, make sure to provide raise()
72ifneq (,$(findstring -mabi=aapcs-linux,$(PLATFORM_CPPFLAGS)))
73# This file is parsed many times, so the string may get added multiple
74# times. Also, the prefix needs to be different based on whether
75# CONFIG_SPL_BUILD is defined or not. 'filter-out' the existing entry
76# before adding the correct one.
77PLATFORM_LIBS := arch/arm/lib/eabi_compat.o \
78	$(filter-out arch/arm/lib/eabi_compat.o, $(PLATFORM_LIBS))
79endif
80
81# needed for relocation
82LDFLAGS_u-boot += -pie
83
84#
85# FIXME: binutils versions < 2.22 have a bug in the assembler where
86# branches to weak symbols can be incorrectly optimized in thumb mode
87# to a short branch (b.n instruction) that won't reach when the symbol
88# gets preempted
89#
90# http://sourceware.org/bugzilla/show_bug.cgi?id=12532
91#
92ifeq ($(CONFIG_SYS_THUMB_BUILD),y)
93ifeq ($(GAS_BUG_12532),)
94export GAS_BUG_12532:=$(shell if [ $(call binutils-version) -lt 0222 ] ; \
95	then echo y; else echo n; fi)
96endif
97ifeq ($(GAS_BUG_12532),y)
98PLATFORM_RELFLAGS += -fno-optimize-sibling-calls
99endif
100endif
101
102ifneq ($(CONFIG_SPL_BUILD),y)
103# Check that only R_ARM_RELATIVE relocations are generated.
104ALL-y += checkarmreloc
105# The movt / movw can hardcode 16 bit parts of the addresses in the
106# instruction. Relocation is not supported for that case, so disable
107# such usage by requiring word relocations.
108PLATFORM_CPPFLAGS += $(call cc-option, -mword-relocations)
109endif
110
111# limit ourselves to the sections we want in the .bin.
112ifdef CONFIG_ARM64
113OBJCOPYFLAGS += -j .text -j .rodata -j .data -j .u_boot_list -j .rela.dyn
114else
115OBJCOPYFLAGS += -j .text -j .secure_text -j .rodata -j .hash -j .data -j \
116	.got -j .got.plt -j .u_boot_list -j .rel.dyn
117endif
118
119ifdef CONFIG_OF_EMBED
120OBJCOPYFLAGS += -j .dtb.init.rodata
121endif
122
123ifneq ($(CONFIG_IMX_CONFIG),)
124ifdef CONFIG_SPL
125ifndef CONFIG_SPL_BUILD
126ALL-y += SPL
127endif
128else
129ifeq ($(CONFIG_OF_SEPARATE),y)
130ALL-y += u-boot-dtb.imx
131else
132ALL-y += u-boot.imx
133endif
134endif
135endif
136