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

   1 # SPDX-License-Identifier: GPL-2.0-or-later
   2
   3 #
   4 # Makefile for the LZMA compressed kernel loader for BMIPS based boards
   5 #
   6 # Copyright (C) 2020 Álvaro Fernández Rojas <noltari@gmail.com>
   7 # Copyright (C) 2014 Jonas Gorski <jogo@openwrt.org>
   8 # Copyright (C) 2011 Gabor Juhos <juhosg@openwrt.org>
   9 #
  10 # Some parts of this file was based on the OpenWrt specific lzma-loader
  11 # for the BCM47xx and ADM5120 based boards:
  12 #       Copyright (C) 2004 Manuel Novoa III (mjn3@codepoet.org)
  13 #       Copyright (C) 2005 Mineharu Takahara <mtakahar@yahoo.com>
  14 #       Copyright (C) 2005 by Oleg I. Vdovikin <oleg@cs.msu.su>
  15 #
  16
  17 LOADER_ADDR     :=
  18 KERNEL_ADDR     :=
  19 LZMA_TEXT_START := 0x80a00000
  20 LOADER_DATA     :=
  21
  22 CC              := $(CROSS_COMPILE)gcc
  23 LD              := $(CROSS_COMPILE)ld
  24 OBJCOPY         := $(CROSS_COMPILE)objcopy
  25 OBJDUMP         := $(CROSS_COMPILE)objdump
  26
  27 BIN_FLAGS       := -O binary -R .reginfo -R .note -R .comment -R .mdebug \
  28                    -R .MIPS.abiflags -S
  29
  30 CFLAGS          = -D__KERNEL__ -Wall -Wstrict-prototypes -Wno-trigraphs -Os \
  31                   -fno-strict-aliasing -fno-common -fomit-frame-pointer -G 0 \
  32                   -mno-abicalls -fno-pic -ffunction-sections -pipe \
  33                   -ffreestanding -fhonour-copts \
  34                   -mabi=32 -march=mips32 \
  35                   -Wa,-32 -Wa,-march=mips32 -Wa,-mips32 -Wa,--trap
  36 CFLAGS          += -D_LZMA_PROB32
  37 CFLAGS          += -DUART_BASE=$(UART_BASE)
  38
  39 ASFLAGS         = $(CFLAGS) -D__ASSEMBLY__
  40
  41 LDFLAGS         = -static --gc-sections -no-warn-mismatch
  42 LDFLAGS         += -e startup -T loader.lds -Ttext $(LZMA_TEXT_START)
  43
  44 O_FORMAT        = $(shell $(OBJDUMP) -i | head -2 | grep elf32)
  45
  46 OBJECTS         := head.o loader.o cache.o board.o printf.o LzmaDecode.o
  47
  48 ifneq ($(strip $(LOADER_DATA)),)
  49 OBJECTS         += data.o
  50 CFLAGS          += -DLZMA_WRAPPER=1 -DLOADADDR=$(KERNEL_ADDR)
  51 endif
  52
  53
  54 all: loader.elf
  55
  56 # Don't build dependencies, this may die if $(CC) isn't gcc
  57 dep:
  58
  59 install:
  60
  61 %.o : %.c
  62         $(CC) $(CFLAGS) -c -o $@ $<
  63
  64 %.o : %.S
  65         $(CC) $(ASFLAGS) -c -o $@ $<
  66
  67 data.o: $(LOADER_DATA)
  68         $(LD) -r -b binary --oformat $(O_FORMAT) -T lzma-data.lds -o $@ $<
  69
  70 loader: $(OBJECTS)
  71         $(LD) $(LDFLAGS) -o $@ $(OBJECTS)
  72
  73 loader.bin: loader
  74         $(OBJCOPY) $(BIN_FLAGS) $< $@
  75
  76 loader2.o: loader.bin
  77         $(LD) -r -b binary --oformat $(O_FORMAT) -o $@ $<
  78
  79 loader.elf: loader2.o
  80         $(LD) -e startup -T loader2.lds -Ttext $(LOADER_ADDR) -o $@ $<
  81
  82 mrproper: clean
  83
  84 clean:
  85         rm -f loader *.elf *.bin *.o