CROSS_COMPILE ?= arm-linux-
ifndef CONFIG_STANDALONE_LOAD_ADDR
-ifeq ($(SOC),omap3)
+ifneq ($(CONFIG_AM33XX)$(CONFIG_OMAP34XX)$(CONFIG_OMAP44XX)$(CONFIG_OMAP54XX)$(CONFIG_TI814X),)
CONFIG_STANDALONE_LOAD_ADDR = 0x80300000
else
CONFIG_STANDALONE_LOAD_ADDR = 0xc100000
endif
endif
+LDFLAGS_FINAL += --gc-sections
+PLATFORM_RELFLAGS += -ffunction-sections -fdata-sections
+
+# Support generic board on ARM
+__HAVE_ARCH_GENERIC_BOARD := y
+
PLATFORM_CPPFLAGS += -DCONFIG_ARM -D__ARM__
-# Explicitly specifiy 32-bit ARM ISA since toolchain default can be -mthumb:
-PF_CPPFLAGS_ARM := $(call cc-option,-marm,)
+# Choose between ARM/Thumb instruction sets
+ifeq ($(CONFIG_SYS_THUMB_BUILD),y)
+PF_CPPFLAGS_ARM := $(call cc-option, -mthumb -mthumb-interwork,\
+ $(call cc-option,-marm,)\
+ $(call cc-option,-mno-thumb-interwork,)\
+ )
+else
+PF_CPPFLAGS_ARM := $(call cc-option,-marm,) \
+ $(call cc-option,-mno-thumb-interwork,)
+endif
+
+# Only test once
+ifneq ($(CONFIG_SPL_BUILD),y)
+ALL-$(CONFIG_SYS_THUMB_BUILD) += checkthumb
+endif
# Try if EABI is supported, else fall back to old API,
# i. e. for example:
# - with ELDK 4.2 (EABI supported), use:
-# -mabi=aapcs-linux -mno-thumb-interwork
+# -mabi=aapcs-linux
# - with ELDK 4.1 (gcc 4.x, no EABI), use:
-# -mabi=apcs-gnu -mno-thumb-interwork
+# -mabi=apcs-gnu
# - with ELDK 3.1 (gcc 3.x), use:
-# -mapcs-32 -mno-thumb-interwork
+# -mapcs-32
PF_CPPFLAGS_ABI := $(call cc-option,\
- -mabi=aapcs-linux -mno-thumb-interwork,\
+ -mabi=aapcs-linux,\
$(call cc-option,\
-mapcs-32,\
$(call cc-option,\
-mabi=apcs-gnu,\
)\
- ) $(call cc-option,-mno-thumb-interwork,)\
+ )\
)
PLATFORM_CPPFLAGS += $(PF_CPPFLAGS_ARM) $(PF_CPPFLAGS_ABI)
endif
# needed for relocation
-ifndef CONFIG_NAND_SPL
LDFLAGS_u-boot += -pie
+
+#
+# FIXME: binutils versions < 2.22 have a bug in the assembler where
+# branches to weak symbols can be incorrectly optimized in thumb mode
+# to a short branch (b.n instruction) that won't reach when the symbol
+# gets preempted
+#
+# http://sourceware.org/bugzilla/show_bug.cgi?id=12532
+#
+ifeq ($(CONFIG_SYS_THUMB_BUILD),y)
+ifeq ($(GAS_BUG_12532),)
+export GAS_BUG_12532:=$(shell if [ $(call binutils-version) -lt 0222 ] ; \
+ then echo y; else echo n; fi)
+endif
+ifeq ($(GAS_BUG_12532),y)
+PLATFORM_RELFLAGS += -fno-optimize-sibling-calls
+endif
endif