target/linux/generic-2.6/image/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 RAMSTART = 0x80000000
   8 RAMSIZE = 0x00100000            # 1MB
   9 LOADADDR = 0x80400000           # RAM start + 4M
  10 KERNEL_ENTRY = 0x80001000
  11 IMAGE_COPY:=0
  12
  13 CROSS_COMPILE = mips-linux-
  14
  15 OBJCOPY:= $(CROSS_COMPILE)objcopy -O binary -R .reginfo -R .note -R .comment -R .mdebug -S
  16 CFLAGS := -fno-builtin -Os -G 0 -ffunction-sections -mno-abicalls -fno-pic -mabi=32 -march=mips32 -Wa,-32 -Wa,-march=mips32 -Wa,-mips32 -Wa,--trap -Wall -DRAMSTART=${RAMSTART} -DRAMSIZE=${RAMSIZE} -DKERNEL_ENTRY=${KERNEL_ENTRY} -D_LZMA_IN_CB
  17 ifeq ($(IMAGE_COPY),1)
  18 CFLAGS += -DLOADADDR=${LOADADDR} -DIMAGE_COPY=1
  19 endif
  20
  21 .S.s:
  22         $(CPP) $(CFLAGS) $< -o $*.s
  23 .S.o:
  24         $(CC) $(CFLAGS) -c $< -o $*.o
  25 .c.o:
  26         $(CC) $(CFLAGS) -c $< -o $*.o
  27
  28 CC =       $(CROSS_COMPILE)gcc
  29 LD =       $(CROSS_COMPILE)ld
  30 OBJDUMP =  $(CROSS_COMPILE)objdump
  31
  32 O_FORMAT = $(shell $(OBJDUMP) -i | head -2 | grep elf32)
  33
  34 # Drop some uninteresting sections in the kernel.
  35 # This is only relevant for ELF kernels but doesn't hurt a.out
  36 drop-sections   = .reginfo .mdebug .comment
  37 strip-flags     = $(addprefix --remove-section=,$(drop-sections))
  38
  39 all : lzma.elf
  40
  41 lzma.lds: lzma.lds.in
  42         sed -e 's,@LOADADDR@,$(LOADADDR),g' -e 's,@ENTRY@,_start,g' $< >$@
  43
  44 kernel.o: vmlinux.lzma lzma.lds
  45         $(LD) -r -b binary --oformat $(O_FORMAT) -o $@ $<
  46
  47 ifeq ($(IMAGE_COPY),1)
  48 LOADER_ENTRY ?= $(KERNEL_ENTRY)
  49 lzma.o: decompress.o LzmaDecode.o kernel.o
  50         sed -e 's,@LOADADDR@,$(LOADADDR),g' -e 's,@ENTRY@,entry,g' lzma.lds.in >lzma-stage2.lds
  51         $(LD) -static --no-warn-mismatch -e entry -Tlzma-stage2.lds -o temp-$@ $^
  52         $(OBJCOPY) temp-$@ lzma.tmp
  53         @echo "SECTIONS { .data : { code_start = .; *(.data) code_stop = .; }}" > lzma-data.lds
  54         $(LD) -no-warn-mismatch -T lzma-data.lds -r -o $@ -b binary lzma.tmp --oformat $(O_FORMAT)
  55
  56 lzma.elf: start.o lzma.o
  57         sed -e 's,@LOADADDR@,$(LOADER_ENTRY),g' lzma-copy.lds.in >lzma-copy.lds
  58         $(LD) -s -Tlzma-copy.lds -o $@ $^
  59 else
  60 lzma.elf: start.o decompress.o LzmaDecode.o kernel.o
  61         $(LD) -s -Tlzma.lds -o $@ $^
  62 endif
  63
  64 clean:
  65         rm -f *.o lzma.elf *.tmp *.lds