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
18LOADADDR	:=
19LZMA_TEXT_START	:= 0x80a00000
20LOADER_DATA	:=
21BOARD		:=
22FLASH_OFFS	:=
23FLASH_MAX	:=
24
25CC		:= $(CROSS_COMPILE)gcc
26LD		:= $(CROSS_COMPILE)ld
27OBJCOPY		:= $(CROSS_COMPILE)objcopy
28OBJDUMP		:= $(CROSS_COMPILE)objdump
29
30BIN_FLAGS	:= -O binary -R .reginfo -R .note -R .comment -R .mdebug \
31		   -R .MIPS.abiflags -S
32
33CFLAGS		= -D__KERNEL__ -Wall -Wstrict-prototypes -Wno-trigraphs -Os \
34		  -fno-strict-aliasing -fno-common -fomit-frame-pointer -G 0 \
35		  -mno-abicalls -fno-pic -ffunction-sections -pipe -mlong-calls \
36		  -fno-common -ffreestanding -fhonour-copts \
37		  -mabi=32 -march=mips32r2 \
38		  -Wa,-32 -Wa,-march=mips32r2 -Wa,-mips32r2 -Wa,--trap
39CFLAGS		+= -D_LZMA_PROB32
40
41ASFLAGS		= $(CFLAGS) -D__ASSEMBLY__
42
43LDFLAGS		= -static --gc-sections -no-warn-mismatch
44LDFLAGS		+= -e startup -T loader.lds -Ttext $(LZMA_TEXT_START)
45
46O_FORMAT 	= $(shell $(OBJDUMP) -i | head -2 | grep elf32)
47
48OBJECTS		:= head.o loader.o cache.o board.o printf.o LzmaDecode.o
49
50ifneq ($(strip $(LOADER_DATA)),)
51OBJECTS		+= data.o
52CFLAGS		+= -DLZMA_WRAPPER=1 -DLOADADDR=$(LOADADDR)
53endif
54
55ifneq ($(strip $(KERNEL_CMDLINE)),)
56CFLAGS		+= -DCONFIG_KERNEL_CMDLINE='"$(KERNEL_CMDLINE)"'
57endif
58
59ifneq ($(strip $(FLASH_OFFS)),)
60CFLAGS		+= -DCONFIG_FLASH_OFFS=$(FLASH_OFFS)
61endif
62
63ifneq ($(strip $(FLASH_MAX)),)
64CFLAGS		+= -DCONFIG_FLASH_MAX=$(FLASH_MAX)
65endif
66
67BOARD_DEF := $(shell echo $(strip $(BOARD)) | tr a-z A-Z | tr - _)
68ifneq ($(BOARD_DEF),)
69CFLAGS		+= -DCONFIG_BOARD_$(BOARD_DEF)
70endif
71
72all: loader.elf
73
74# Don't build dependencies, this may die if $(CC) isn't gcc
75dep:
76
77install:
78
79%.o : %.c
80	$(CC) $(CFLAGS) -c -o $@ $<
81
82%.o : %.S
83	$(CC) $(ASFLAGS) -c -o $@ $<
84
85data.o: $(LOADER_DATA)
86	$(LD) -r -b binary --oformat $(O_FORMAT) -T lzma-data.lds -o $@ $<
87
88loader: $(OBJECTS)
89	$(LD) $(LDFLAGS) -o $@ $(OBJECTS)
90
91loader.bin: loader
92	$(OBJCOPY) $(BIN_FLAGS) $< $@
93
94loader2.o: loader.bin
95	$(LD) -r -b binary --oformat $(O_FORMAT) -o $@ $<
96
97loader.elf: loader2.o
98	$(LD) -e startup -T loader2.lds -Ttext $(LOADADDR) -o $@ $<
99
100mrproper: clean
101
102clean:
103	rm -f loader *.elf *.bin *.o
104
105
106
107