target/image/generic/lzma-loader/src/Makefile

   1 #
   2 # Copyright (C) 2006 OpenWrt.org
   3 #
   4 # This is free software, licensed under the GNU General Public License v2.
   5 # See /LICENSE for more information.
   6 #
   7 LOADADDR = 0x80400000           # RAM start + 4M
   8 KERNEL_ENTRY = 0x80001000
   9 RAMSIZE = 0x00100000            # 1MB
  10 IMAGE_COPY:=0
  11
  12 CROSS_COMPILE = mips-linux-
  13
  14 OBJCOPY:= $(CROSS_COMPILE)objcopy -O binary -R .reginfo -R .note -R .comment -R .mdebug -S
  15 CFLAGS := -fno-builtin -Os -G 0 -ffunction-sections -mno-abicalls -fno-pic -mabi=32 -march=mips32 -Wa,-32 -Wa,-march=mips32 -Wa,-mips32 -Wa,--trap -Wall -DRAMSIZE=${RAMSIZE} -DKERNEL_ENTRY=${KERNEL_ENTRY} -D_LZMA_IN_CB
  16 ifeq ($(IMAGE_COPY),1)
  17 CFLAGS += -DLOADADDR=${LOADADDR} -DIMAGE_COPY=1
  18 endif
  19
  20 .S.s:
  21         $(CPP) $(CFLAGS) $< -o $*.s
  22 .S.o:
  23         $(CC) $(CFLAGS) -c $< -o $*.o
  24 .c.o:
  25         $(CC) $(CFLAGS) -c $< -o $*.o
  26
  27 CC =       $(CROSS_COMPILE)gcc
  28 LD =       $(CROSS_COMPILE)ld
  29 OBJDUMP =  $(CROSS_COMPILE)objdump
  30
  31 O_FORMAT = $(shell $(OBJDUMP) -i | head -2 | grep elf32)
  32
  33 # Drop some uninteresting sections in the kernel.
  34 # This is only relevant for ELF kernels but doesn't hurt a.out
  35 drop-sections   = .reginfo .mdebug .comment
  36 strip-flags     = $(addprefix --remove-section=,$(drop-sections))
  37
  38 all : lzma.elf
  39
  40 lzma.lds: lzma.lds.in
  41         sed -e 's,@LOADADDR@,$(LOADADDR),g' -e 's,@ENTRY@,_start,g' $< >$@
  42
  43 kernel.o: vmlinux.lzma lzma.lds
  44         $(LD) -r -b binary --oformat $(O_FORMAT) -o $@ $<
  45
  46 ifeq ($(IMAGE_COPY),1)
  47 LOADER_ENTRY ?= $(KERNEL_ENTRY)
  48 lzma.o: decompress.o LzmaDecode.o kernel.o
  49         sed -e 's,@LOADADDR@,$(LOADADDR),g' -e 's,@ENTRY@,entry,g' lzma.lds.in >lzma-stage2.lds
  50         $(LD) -static --no-warn-mismatch -e entry -Tlzma-stage2.lds -o temp-$@ $^
  51         $(OBJCOPY) temp-$@ lzma.tmp
  52         @echo "SECTIONS { .data : { code_start = .; *(.data) code_stop = .; }}" > lzma-data.lds
  53         $(LD) -no-warn-mismatch -T lzma-data.lds -r -o $@ -b binary lzma.tmp --oformat $(O_FORMAT)
  54
  55 lzma.elf: start.o lzma.o
  56         sed -e 's,@LOADADDR@,$(LOADER_ENTRY),g' lzma-copy.lds.in >lzma-copy.lds
  57         $(LD) -s -Tlzma-copy.lds -o $@ $^
  58 else
  59 lzma.elf: start.o decompress.o LzmaDecode.o kernel.o
  60         $(LD) -s -Tlzma.lds -o $@ $^
  61 endif
  62
  63 clean:
  64         rm -f *.o lzma.elf *.tmp *.lds