1# 2# (C) Copyright 2000-2002 3# Wolfgang Denk, DENX Software Engineering, wd@denx.de. 4# 5# See file CREDITS for list of people who contributed to this 6# project. 7# 8# This program is free software; you can redistribute it and/or 9# modify it under the terms of the GNU General Public License as 10# published by the Free Software Foundation; either version 2 of 11# the License, or (at your option) any later version. 12# 13# This program is distributed in the hope that it will be useful, 14# but WITHOUT ANY WARRANTY; without even the implied warranty of 15# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 16# GNU General Public License for more details. 17# 18# You should have received a copy of the GNU General Public License 19# along with this program; if not, write to the Free Software 20# Foundation, Inc., 59 Temple Place, Suite 330, Boston, 21# MA 02111-1307 USA 22# 23 24CROSS_COMPILE ?= arm-linux- 25 26ifndef CONFIG_STANDALONE_LOAD_ADDR 27ifeq ($(SOC),omap3) 28CONFIG_STANDALONE_LOAD_ADDR = 0x80300000 29else 30CONFIG_STANDALONE_LOAD_ADDR = 0xc100000 31endif 32endif 33 34PLATFORM_CPPFLAGS += -DCONFIG_ARM -D__ARM__ 35 36# Choose between ARM/Thumb instruction sets 37ifeq ($(CONFIG_SYS_THUMB_BUILD),y) 38PF_CPPFLAGS_ARM := $(call cc-option, -mthumb -mthumb-interwork,\ 39 $(call cc-option,-marm,)\ 40 $(call cc-option,-mno-thumb-interwork,)\ 41 ) 42else 43PF_CPPFLAGS_ARM := $(call cc-option,-marm,) \ 44 $(call cc-option,-mno-thumb-interwork,) 45endif 46 47# Only test once 48ifneq ($(CONFIG_SPL_BUILD),y) 49ALL-$(CONFIG_SYS_THUMB_BUILD) += checkthumb 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. 77ifdef CONFIG_SPL_BUILD 78PLATFORM_LIBS := $(SPLTREE)/arch/arm/lib/eabi_compat.o \ 79 $(filter-out %/arch/arm/lib/eabi_compat.o, $(PLATFORM_LIBS)) 80else 81PLATFORM_LIBS := $(OBJTREE)/arch/arm/lib/eabi_compat.o \ 82 $(filter-out %/arch/arm/lib/eabi_compat.o, $(PLATFORM_LIBS)) 83endif 84endif 85 86# needed for relocation 87ifndef CONFIG_NAND_SPL 88LDFLAGS_u-boot += -pie 89endif 90 91# 92# FIXME: binutils versions < 2.22 have a bug in the assembler where 93# branches to weak symbols can be incorrectly optimized in thumb mode 94# to a short branch (b.n instruction) that won't reach when the symbol 95# gets preempted 96# 97# http://sourceware.org/bugzilla/show_bug.cgi?id=12532 98# 99ifeq ($(CONFIG_SYS_THUMB_BUILD),y) 100ifeq ($(GAS_BUG_12532),) 101export GAS_BUG_12532:=$(shell if [ $(call binutils-version) -lt 0222 ] ; \ 102 then echo y; else echo n; fi) 103endif 104ifeq ($(GAS_BUG_12532),y) 105PLATFORM_RELFLAGS += -fno-optimize-sibling-calls 106endif 107endif 108