target/linux/ath79/image/lzma-loader/src/Makefile

   1 #
   2 # Makefile for the LZMA compressed kernel loader for
   3 # Atheros AR7XXX/AR9XXX based boards
   4 #
   5 # Copyright (C) 2011 Gabor Juhos <juhosg@openwrt.org>
   6 #
   7 # Some parts of this file was based on the OpenWrt specific lzma-loader
   8 # for the BCM47xx and ADM5120 based boards:
   9 #       Copyright (C) 2004 Manuel Novoa III (mjn3@codepoet.org)
  10 #       Copyright (C) 2005 Mineharu Takahara <mtakahar@yahoo.com>
  11 #       Copyright (C) 2005 by Oleg I. Vdovikin <oleg@cs.msu.su>
  12 #
  13 # This program is free software; you can redistribute it and/or modify it
  14 # under the terms of the GNU General Public License version 2 as published
  15 # by the Free Software Foundation.
  16 #
  17
  18 LOADADDR        :=
  19 LZMA_TEXT_START := 0x80a00000
  20 LOADER_DATA     :=
  21 BOARD           :=
  22 FLASH_OFFS      :=
  23 FLASH_MAX       :=
  24 KERNEL_CMDLINE  := rootfstype=squashfs
  25
  26 CC              := $(CROSS_COMPILE)gcc
  27 LD              := $(CROSS_COMPILE)ld
  28 OBJCOPY         := $(CROSS_COMPILE)objcopy
  29 OBJDUMP         := $(CROSS_COMPILE)objdump
  30
  31 BIN_FLAGS       := -O binary -R .reginfo -R .note -R .comment -R .mdebug \
  32                    -R .MIPS.abiflags -S
  33
  34 CFLAGS          = -D__KERNEL__ -Wall -Wstrict-prototypes -Wno-trigraphs -Os \
  35                   -fno-strict-aliasing -fno-common -fomit-frame-pointer -G 0 \
  36                   -mno-abicalls -fno-pic -ffunction-sections -pipe -mlong-calls \
  37                   -fno-common -ffreestanding -fhonour-copts \
  38                   -mabi=32 -march=mips32r2 \
  39                   -Wa,-32 -Wa,-march=mips32r2 -Wa,-mips32r2 -Wa,--trap
  40 CFLAGS          += -D_LZMA_PROB32
  41
  42 ASFLAGS         = $(CFLAGS) -D__ASSEMBLY__
  43
  44 LDFLAGS         = -static --gc-sections -no-warn-mismatch
  45 LDFLAGS         += -e startup -T loader.lds -Ttext $(LZMA_TEXT_START)
  46
  47 O_FORMAT        = $(shell $(OBJDUMP) -i | head -2 | grep elf32)
  48
  49 OBJECTS         := head.o loader.o cache.o board.o printf.o LzmaDecode.o
  50
  51 ifneq ($(strip $(LOADER_DATA)),)
  52 OBJECTS         += data.o
  53 CFLAGS          += -DLZMA_WRAPPER=1 -DLOADADDR=$(LOADADDR)
  54 endif
  55
  56 ifneq ($(strip $(KERNEL_CMDLINE)),)
  57 CFLAGS          += -DCONFIG_KERNEL_CMDLINE='"$(KERNEL_CMDLINE)"'
  58 endif
  59
  60 ifneq ($(strip $(FLASH_OFFS)),)
  61 CFLAGS          += -DCONFIG_FLASH_OFFS=$(FLASH_OFFS)
  62 endif
  63
  64 ifneq ($(strip $(FLASH_MAX)),)
  65 CFLAGS          += -DCONFIG_FLASH_MAX=$(FLASH_MAX)
  66 endif
  67
  68 BOARD_DEF := $(shell echo $(strip $(BOARD)) | tr a-z A-Z | tr - _)
  69 ifneq ($(BOARD_DEF),)
  70 CFLAGS          += -DCONFIG_BOARD_$(BOARD_DEF)
  71 endif
  72
  73 all: loader.elf
  74
  75 # Don't build dependencies, this may die if $(CC) isn't gcc
  76 dep:
  77
  78 install:
  79
  80 %.o : %.c
  81         $(CC) $(CFLAGS) -c -o $@ $<
  82
  83 %.o : %.S
  84         $(CC) $(ASFLAGS) -c -o $@ $<
  85
  86 data.o: $(LOADER_DATA)
  87         $(LD) -r -b binary --oformat $(O_FORMAT) -T lzma-data.lds -o $@ $<
  88
  89 loader: $(OBJECTS)
  90         $(LD) $(LDFLAGS) -o $@ $(OBJECTS)
  91
  92 loader.bin: loader
  93         $(OBJCOPY) $(BIN_FLAGS) $< $@
  94
  95 loader2.o: loader.bin
  96         $(LD) -r -b binary --oformat $(O_FORMAT) -o $@ $<
  97
  98 loader.elf: loader2.o
  99         $(LD) -e startup -T loader2.lds -Ttext $(LOADADDR) -o $@ $<
 100
 101 mrproper: clean
 102
 103 clean:
 104         rm -f loader *.elf *.bin *.o
 105
 106
 107