upstream u-boot with additional patches for our devices/boards: https://lists.denx.de/pipermail/u-boot/2017-March/282789.html (AXP crashes) ; Gbit ethernet patch for some LIME2 revisions ; with SPI flash support
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u-boot/nand_spl/board/davinci/da8xxevm/Makefile

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#
# (C) Copyright 2006-2007
# Stefan Roese, DENX Software Engineering, sr@denx.de.
#
# (C) Copyright 2008
# Guennadi Liakhovetki, DENX Software Engineering, <lg@denx.de>
#
# See file CREDITS for list of people who contributed to this
# project.
#
# This program is free software; you can redistribute it and/or
# modify it under the terms of the GNU General Public License as
# published by the Free Software Foundation; either version 2 of
# the License, or (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the Free Software
# Foundation, Inc., 59 Temple Place, Suite 330, Boston,
# MA 02111-1307 USA
#
CONFIG_NAND_SPL = y
include $(TOPDIR)/config.mk
nandobj := $(OBJTREE)/nand_spl/
LDSCRIPT= $(TOPDIR)/nand_spl/board/$(BOARDDIR)/u-boot.lds
LDFLAGS := -T $(nandobj)u-boot.lds -Ttext $(CONFIG_SYS_TEXT_BASE) $(LDFLAGS) \
$(LDFLAGS_FINAL)
AFLAGS += -DCONFIG_SPL_BUILD -DCONFIG_NAND_SPL
CFLAGS += -DCONFIG_SPL_BUILD -DCONFIG_NAND_SPL
SOBJS = _divsi3.o \
_udivsi3.o \
start.o
COBJS = cpu.o \
davinci_nand.o \
davinci_pinmux.o \
div0.o \
hawkboard_nand_spl.o \
memsize.o \
misc.o \
nand_boot.o \
ns16550.o \
psc.o
SRCS := $(addprefix $(obj),$(SOBJS:.o=.S) $(COBJS:.o=.c))
OBJS := $(addprefix $(obj),$(SOBJS) $(COBJS))
__OBJS := $(SOBJS) $(COBJS)
LNDIR := $(nandobj)board/$(BOARDDIR)
ALL = $(nandobj)u-boot-spl $(nandobj)u-boot-spl.bin \
$(nandobj)u-boot-spl-16k.bin
all: $(ALL)
$(nandobj)u-boot-spl-16k.bin: $(nandobj)u-boot-spl
$(OBJCOPY) ${OBJCFLAGS} --pad-to=$(PAD_TO) -O binary $< $@
$(nandobj)u-boot-spl.bin: $(nandobj)u-boot-spl
$(OBJCOPY) ${OBJCFLAGS} -O binary $< $@
$(nandobj)u-boot-spl: $(OBJS) $(nandobj)u-boot.lds
cd $(LNDIR) && $(LD) $(LDFLAGS) $(__OBJS) \
-Map $(nandobj)u-boot-spl.map \
-o $(nandobj)u-boot-spl
$(nandobj)u-boot.lds: $(LDSCRIPT)
$(CPP) $(CPPFLAGS) $(LDPPFLAGS) -ansi -D__ASSEMBLY__ -P - <$^ >$@
# create symbolic links for common files
# from board directory
$(obj)davinci_pinmux.c:
@rm -f $@
@ln -s $(TOPDIR)/board/davinci/common/davinci_pinmux.c $@
# from drivers/mtd/nand directory
$(obj)davinci_nand.c:
@rm -f $@
@ln -s $(TOPDIR)/drivers/mtd/nand/davinci_nand.c $@
# from nand_spl directory
$(obj)nand_boot.c:
@rm -f $@
@ln -s $(TOPDIR)/nand_spl/nand_boot.c $@
# from drivers/serial directory
$(obj)ns16550.c:
@rm -f $@
@ln -sf $(TOPDIR)/drivers/serial/ns16550.c $@
# from cpu directory
$(obj)start.S:
@rm -f $@
ln -s $(TOPDIR)/arch/arm/cpu/arm926ejs/start.S $@
# from lib directory
$(obj)_udivsi3.S:
@rm -f $@
ln -s $(TOPDIR)/arch/arm/lib/_udivsi3.S $@
# from lib directory
$(obj)_divsi3.S:
@rm -f $@
ln -s $(TOPDIR)/arch/arm/lib/_divsi3.S $@
# from lib directory
$(obj)div0.c:
@rm -f $@
ln -s $(TOPDIR)/arch/arm/lib/div0.c $@
# from SoC directory
$(obj)cpu.c:
@rm -f $@
@ln -s $(TOPDIR)/arch/arm/cpu/arm926ejs/davinci/cpu.c $@
# from board directory
$(obj)hawkboard_nand_spl.c:
@rm -f $@
ln -s $(TOPDIR)/board/davinci/da8xxevm/hawkboard_nand_spl.c $@
# from board directory
$(obj)misc.c:
@rm -f $@
ln -s $(TOPDIR)/board/davinci/common/misc.c $@
$(obj)psc.c:
@rm -f $@
ln -s $(TOPDIR)/arch/arm/cpu/arm926ejs/davinci/psc.c $@
# from common directory
$(obj)memsize.c:
@rm -f $@
ln -s $(TOPDIR)/common/memsize.c $@
#########################################################################
$(obj)%.o: $(obj)%.S
$(CC) $(AFLAGS) -c -o $@ $<
$(obj)%.o: $(obj)%.c
$(CC) $(CFLAGS) -c -o $@ $<
# defines $(obj).depend target
include $(SRCTREE)/rules.mk
sinclude $(obj).depend
#########################################################################