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1b8bd17c2d
...and max flash offset The mtdsplit parser was recently refactored to allow the kernel to have custom image header magic. Let's also do this for the lzma-loader For example: When implemented together, this allows the kernel to "appear" to be a rootfs by OEM software in order to write an image that is actually kernel + rootfs. At the same time, it would boot to openwrt normally by setting the same magic in DTS. Both of the variables have a default value that is unchanged when not defined in the makefiles This has no effect on the size of the loader when lzma compressed. Signed-off-by: Michael Pratt <mcpratt@pm.me>
114 lines
2.8 KiB
Makefile
114 lines
2.8 KiB
Makefile
#
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# Makefile for the LZMA compressed kernel loader for
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# Atheros AR7XXX/AR9XXX based boards
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#
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# Copyright (C) 2011 Gabor Juhos <juhosg@openwrt.org>
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#
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# Some parts of this file was based on the OpenWrt specific lzma-loader
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# for the BCM47xx and ADM5120 based boards:
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# Copyright (C) 2004 Manuel Novoa III (mjn3@codepoet.org)
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# Copyright (C) 2005 Mineharu Takahara <mtakahar@yahoo.com>
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# Copyright (C) 2005 by Oleg I. Vdovikin <oleg@cs.msu.su>
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#
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# This program is free software; you can redistribute it and/or modify it
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# under the terms of the GNU General Public License version 2 as published
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# by the Free Software Foundation.
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#
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LOADADDR :=
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LZMA_TEXT_START := 0x80a00000
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LOADER_DATA :=
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KERNEL_MAGIC :=
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BOARD :=
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FLASH_OFFS :=
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FLASH_MAX :=
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CC := $(CROSS_COMPILE)gcc
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LD := $(CROSS_COMPILE)ld
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OBJCOPY := $(CROSS_COMPILE)objcopy
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OBJDUMP := $(CROSS_COMPILE)objdump
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BIN_FLAGS := -O binary -R .reginfo -R .note -R .comment -R .mdebug \
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-R .MIPS.abiflags -S
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CFLAGS = -D__KERNEL__ -Wall -Wstrict-prototypes -Wno-trigraphs -Os \
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-fno-strict-aliasing -fno-common -fomit-frame-pointer -G 0 \
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-mno-abicalls -fno-pic -ffunction-sections -pipe -mlong-calls \
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-fno-common -ffreestanding -fhonour-copts -nostartfiles \
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-mabi=32 -march=mips32r2 \
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-Wa,-32 -Wa,-march=mips32r2 -Wa,-mips32r2 -Wa,--trap
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CFLAGS += -D_LZMA_PROB32
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CFLAGS += -flto
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ASFLAGS = $(CFLAGS) -D__ASSEMBLY__
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LDFLAGS = -static -Wl,--gc-sections -Wl,-no-warn-mismatch
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LDFLAGS += -Wl,-e,startup -T loader.lds -Wl,-Ttext,$(LZMA_TEXT_START)
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LDFLAGS += -flto -fwhole-program
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O_FORMAT = $(shell $(OBJDUMP) -i | head -2 | grep elf32)
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OBJECTS := head.o loader.o cache.o board.o printf.o LzmaDecode.o
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ifneq ($(strip $(LOADER_DATA)),)
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OBJECTS += data.o
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CFLAGS += -DLZMA_WRAPPER=1 -DLOADADDR=$(LOADADDR)
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endif
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ifneq ($(strip $(KERNEL_MAGIC)),)
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CFLAGS += -DCONFIG_KERNEL_MAGIC=$(KERNEL_MAGIC)
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endif
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ifneq ($(strip $(KERNEL_CMDLINE)),)
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CFLAGS += -DCONFIG_KERNEL_CMDLINE='"$(KERNEL_CMDLINE)"'
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endif
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ifneq ($(strip $(FLASH_OFFS)),)
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CFLAGS += -DCONFIG_FLASH_OFFS=$(FLASH_OFFS)
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endif
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ifneq ($(strip $(FLASH_MAX)),)
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CFLAGS += -DCONFIG_FLASH_MAX=$(FLASH_MAX)
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endif
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BOARD_DEF := $(shell echo $(strip $(BOARD)) | tr a-z A-Z | tr - _)
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ifneq ($(BOARD_DEF),)
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CFLAGS += -DCONFIG_BOARD_$(BOARD_DEF)
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endif
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all: loader.elf
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# Don't build dependencies, this may die if $(CC) isn't gcc
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dep:
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install:
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%.o : %.c
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$(CC) $(CFLAGS) -c -o $@ $<
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%.o : %.S
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$(CC) $(ASFLAGS) -c -o $@ $<
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data.o: $(LOADER_DATA)
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$(LD) -r -b binary --oformat $(O_FORMAT) -T lzma-data.lds -o $@ $<
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loader: $(OBJECTS)
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$(CC) $(CFLAGS) $(LDFLAGS) -o $@ $(OBJECTS)
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loader.bin: loader
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$(OBJCOPY) $(BIN_FLAGS) $< $@
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loader2.o: loader.bin
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$(LD) -r -b binary --oformat $(O_FORMAT) -o $@ $<
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loader.elf: loader2.o
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$(LD) -z max-page-size=0x1000 -e startup -T loader2.lds -Ttext $(LOADADDR) -o $@ $<
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mrproper: clean
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clean:
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rm -f loader *.elf *.bin *.o
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