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#
# Makefile for the LZMA compressed kernel loader for
# Atheros AR7XXX/AR9XXX based boards
#
# Copyright (C) 2020 Álvaro Fernández Rojas <noltari@gmail.com>
# Copyright (C) 2014 Jonas Gorski <jogo@openwrt.org>
# Copyright (C) 2011 Gabor Juhos <juhosg@openwrt.org>
#
# Some parts of this file was based on the OpenWrt specific lzma-loader
# for the BCM47xx and ADM5120 based boards:
# Copyright (C) 2004 Manuel Novoa III (mjn3@codepoet.org)
# Copyright (C) 2005 Mineharu Takahara <mtakahar@yahoo.com>
# Copyright (C) 2005 by Oleg I. Vdovikin <oleg@cs.msu.su>
#
# This program is free software; you can redistribute it and/or modify it
# under the terms of the GNU General Public License version 2 as published
# by the Free Software Foundation.
#
LOADER_ADDR :=
KERNEL_ADDR :=
LZMA_TEXT_START := 0x80a00000
LOADER_DATA :=
CC := $(CROSS_COMPILE)gcc
LD := $(CROSS_COMPILE)ld
OBJCOPY := $(CROSS_COMPILE)objcopy
OBJDUMP := $(CROSS_COMPILE)objdump
BIN_FLAGS := -O binary -R .reginfo -R .note -R .comment -R .mdebug \
-R .MIPS.abiflags -S
CFLAGS = -D__KERNEL__ -Wall -Wstrict-prototypes -Wno-trigraphs -Os \
-fno-strict-aliasing -fno-common -fomit-frame-pointer -G 0 \
-mno-abicalls -fno-pic -ffunction-sections -pipe \
-ffreestanding -fhonour-copts \
-mabi=32 -march=mips32 \
-Wa,-32 -Wa,-march=mips32 -Wa,-mips32 -Wa,--trap
CFLAGS += -D_LZMA_PROB32
CFLAGS += -DUART_BASE=$(UART_BASE)
ASFLAGS = $(CFLAGS) -D__ASSEMBLY__
LDFLAGS = -static --gc-sections -no-warn-mismatch
LDFLAGS += -e startup -T loader.lds -Ttext $(LZMA_TEXT_START)
O_FORMAT = $(shell $(OBJDUMP) -i | head -2 | grep elf32)
OBJECTS := head.o loader.o cache.o board.o printf.o LzmaDecode.o
ifneq ($(strip $(LOADER_DATA)),)
OBJECTS += data.o
CFLAGS += -DLZMA_WRAPPER=1 -DLOADADDR=$(KERNEL_ADDR)
endif
all: loader.elf
# Don't build dependencies, this may die if $(CC) isn't gcc
dep:
install:
%.o : %.c
$(CC) $(CFLAGS) -c -o $@ $<
%.o : %.S
$(CC) $(ASFLAGS) -c -o $@ $<
data.o: $(LOADER_DATA)
$(LD) -r -b binary --oformat $(O_FORMAT) -T lzma-data.lds -o $@ $<
loader: $(OBJECTS)
$(LD) $(LDFLAGS) -o $@ $(OBJECTS)
loader.bin: loader
$(OBJCOPY) $(BIN_FLAGS) $< $@
loader2.o: loader.bin
$(LD) -r -b binary --oformat $(O_FORMAT) -o $@ $<
loader.elf: loader2.o
$(LD) -e startup -T loader2.lds -Ttext $(LOADER_ADDR) -o $@ $<
mrproper: clean
clean:
rm -f loader *.elf *.bin *.o
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