NanoPayload

Annotated stage2/Makefile

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2015-06-14 Paul Boddie file changeset files shortlog Introduced initial support for non-PIC stage 2 payloads that do not need their objects relocating, tested to be bootable from MMC. stage2-non-pic
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# Makefile - Build the NanoNote payload
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#
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# Copyright (C) 2015 Paul Boddie <paul@boddie.org.uk>
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# Copyright (C) Xiangfu Liu <xiangfu@sharism.cc>
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#
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# This program is free software; you can redistribute it and/or modify it under
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# the terms of the GNU General Public License as published by the Free Software
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# Foundation; either version 3 of the License, or (at your option) any later
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# version.
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#
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# This program is distributed in the hope that it will be useful, but WITHOUT
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# ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
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# FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more
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# details.
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#
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# You should have received a copy of the GNU General Public License along with
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# this program.  If not, see <http://www.gnu.org/licenses/>.
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ARCH = mipsel-linux-gnu
 
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CC = $(ARCH)-gcc
 
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LD = $(ARCH)-ld
 
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MKIMAGE = mkimage
 
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NM = $(ARCH)-nm
 
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OBJCOPY=$(ARCH)-objcopy
 
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OBJDUMP=$(ARCH)-objdump
 
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# NOTE: -O2 is actually needed to prevent memcpy references, whereas probably
 
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# NOTE: one of the -f{freestanding, no-hosted, no-builtin} options should work.
 
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# NOTE: See: https://gcc.gnu.org/bugzilla/show_bug.cgi?id=56888
 
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CFLAGS = -O2 -Wall \
 
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	-fno-unit-at-a-time -fno-zero-initialized-in-bss \
 
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	-ffreestanding -fno-hosted -fno-builtin \
 
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	-march=mips32 \
 
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	-I../include
 
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LDFLAGS = -nostdlib -EL
 
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UIMAGE = uImage
 
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PAYLOAD = stage2.bin
 
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TARGET = $(PAYLOAD:.bin=.elf)
 
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DUMP = $(PAYLOAD:.bin=.dump)
 
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MAP = $(PAYLOAD:.bin=.map)
 
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# Configure target-specific objects.
 
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NANONOTE_SRC = board-nanonote.c nanonote_gpm940b0.c
 
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NANONOTE_OBJ = board-nanonote.o nanonote_gpm940b0.o
 
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MINIPC_SRC = board-minipc.c minipc_claa070vc01.c
 
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MINIPC_OBJ = board-minipc.o minipc_claa070vc01.o
 
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ifdef MINIPC
 
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BOARD_SRC = $(MINIPC_SRC)
 
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BOARD_OBJ = $(MINIPC_OBJ)
 
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BOARD_DEFS = -DCONFIG_CPU_JZ4730_MINIPC -DCONFIG_CPU_JZ4730
 
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else
 
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BOARD_SRC = $(NANONOTE_SRC)
 
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BOARD_OBJ = $(NANONOTE_OBJ)
 
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BOARD_DEFS =
 
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endif
 
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DEFS = $(BOARD_DEFS)
 
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# Ordering of objects is important and cannot be left to replacement rules.
 
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SRC = head2.S stage2.c lcd.c jzlcd.c board.c $(BOARD_SRC)
 
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OBJ = head2.o stage2.o lcd.o jzlcd.o board.o $(BOARD_OBJ)
 
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.PHONY:	all clean distclean
 
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all:	$(PAYLOAD) $(UIMAGE)
 
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clean:
 
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	rm -f $(OBJ) $(TARGET) $(PAYLOAD) $(UIMAGE) $(DUMP) *.map
 
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distclean: clean
 
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	echo "Nothing else to clean."
 
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$(UIMAGE): $(PAYLOAD)
 
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	$(MKIMAGE) -A mips -O linux -T kernel -C none -a 0x80010000 -e 0x80010000 -n NanoPayload -d $(PAYLOAD) $(UIMAGE)
 
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$(PAYLOAD): $(TARGET)
 
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	$(OBJCOPY) -O binary $(@:.bin=.elf) $@+
 
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	$(OBJDUMP) -D $(@:.bin=.elf) > $(@:.bin=.dump)
 
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	$(OBJDUMP) -h $(@:.bin=.elf) > $(@:.bin=.map)
 
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	$(NM) -n $(@:.bin=.elf) > System.map
 
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	chmod -x $@+
 
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	mv -f $@+ $@
 
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stage2.elf: $(OBJ)
 
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	$(LD) $(LDFLAGS) -T $(@:.elf=.ld) $(OBJ) -o $@
 
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.c.o:
 
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	$(CC) -c $(CFLAGS) $(DEFS) $< -o $@
 
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.S.o:
 
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	$(CC) -c $(CFLAGS) $(DEFS) $< -o $@