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 27ifneq ($(CONFIG_AM33XX)$(CONFIG_OMAP34XX)$(CONFIG_OMAP44XX)$(CONFIG_OMAP54XX)$(CONFIG_TI814X),) 28CONFIG_STANDALONE_LOAD_ADDR = 0x80300000 29else 30CONFIG_STANDALONE_LOAD_ADDR = 0xc100000 31endif 32endif 33 34# Support generic board on ARM 35__HAVE_ARCH_GENERIC_BOARD := y 36 37PLATFORM_CPPFLAGS += -DCONFIG_ARM -D__ARM__ 38 39# Choose between ARM/Thumb instruction sets 40ifeq ($(CONFIG_SYS_THUMB_BUILD),y) 41PF_CPPFLAGS_ARM := $(call cc-option, -mthumb -mthumb-interwork,\ 42 $(call cc-option,-marm,)\ 43 $(call cc-option,-mno-thumb-interwork,)\ 44 ) 45else 46PF_CPPFLAGS_ARM := $(call cc-option,-marm,) \ 47 $(call cc-option,-mno-thumb-interwork,) 48endif 49 50# Only test once 51ifneq ($(CONFIG_SPL_BUILD),y) 52ALL-$(CONFIG_SYS_THUMB_BUILD) += checkthumb 53endif 54 55# Try if EABI is supported, else fall back to old API, 56# i. e. for example: 57# - with ELDK 4.2 (EABI supported), use: 58# -mabi=aapcs-linux 59# - with ELDK 4.1 (gcc 4.x, no EABI), use: 60# -mabi=apcs-gnu 61# - with ELDK 3.1 (gcc 3.x), use: 62# -mapcs-32 63PF_CPPFLAGS_ABI := $(call cc-option,\ 64 -mabi=aapcs-linux,\ 65 $(call cc-option,\ 66 -mapcs-32,\ 67 $(call cc-option,\ 68 -mabi=apcs-gnu,\ 69 )\ 70 )\ 71 ) 72PLATFORM_CPPFLAGS += $(PF_CPPFLAGS_ARM) $(PF_CPPFLAGS_ABI) 73 74# For EABI, make sure to provide raise() 75ifneq (,$(findstring -mabi=aapcs-linux,$(PLATFORM_CPPFLAGS))) 76# This file is parsed many times, so the string may get added multiple 77# times. Also, the prefix needs to be different based on whether 78# CONFIG_SPL_BUILD is defined or not. 'filter-out' the existing entry 79# before adding the correct one. 80ifdef CONFIG_SPL_BUILD 81PLATFORM_LIBS := $(SPLTREE)/arch/arm/lib/eabi_compat.o \ 82 $(filter-out %/arch/arm/lib/eabi_compat.o, $(PLATFORM_LIBS)) 83else 84PLATFORM_LIBS := $(OBJTREE)/arch/arm/lib/eabi_compat.o \ 85 $(filter-out %/arch/arm/lib/eabi_compat.o, $(PLATFORM_LIBS)) 86endif 87endif 88 89# needed for relocation 90ifndef CONFIG_NAND_SPL 91LDFLAGS_u-boot += -pie 92endif 93 94# 95# FIXME: binutils versions < 2.22 have a bug in the assembler where 96# branches to weak symbols can be incorrectly optimized in thumb mode 97# to a short branch (b.n instruction) that won't reach when the symbol 98# gets preempted 99# 100# http://sourceware.org/bugzilla/show_bug.cgi?id=12532 101# 102ifeq ($(CONFIG_SYS_THUMB_BUILD),y) 103ifeq ($(GAS_BUG_12532),) 104export GAS_BUG_12532:=$(shell if [ $(call binutils-version) -lt 0222 ] ; \ 105 then echo y; else echo n; fi) 106endif 107ifeq ($(GAS_BUG_12532),y) 108PLATFORM_RELFLAGS += -fno-optimize-sibling-calls 109endif 110endif 111