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# Makefile - build a kernel+filesystem image for stand-alone Linux booting
#
# Copyright (C) 2011 ARM Limited. All rights reserved.
#
# Use of this source code is governed by a BSD-style license that can be
# found in the LICENSE.txt file.
CPPFLAGS += -DSMP
#CPPFLAGS += -DTHUMB2_KERNEL
CPPFLAGS += -march=armv7-a
CPPFLAGS += -DVEXPRESS
# Turn this on to use an initrd whose contents are in filesystem.cpio.gz
USE_INITRD = no
ifeq ($(USE_INITRD),yes)
CPPFLAGS += -DUSE_INITRD
FILESYSTEM = filesystem.cpio.gz
else
FILESYSTEM =
endif
# MPS (Cortex-M3) definitions
#CPPFLAGS += -DMACH_MPS -DTHUMB2_KERNEL
#CPPFLAGS += -march=armv7-m
#CPPFLAGS += -mthumb -Wa,-mthumb -Wa,-mimplicit-it=always
# Kernel command line
# MPS:
# KCMD = "rdinit=/bin/sh console=ttyAMA3 mem=4M earlyprintk"
# not-vexpress (ie EB, RealviewPB, etc), with initrd
# KCMD = "console=ttyAMA0 mem=256M earlyprintk"
# not-vexpress, without initrd:
# KCMD = "root=/dev/nfs nfsroot=10.1.77.43:/work/debootstrap/arm ip=dhcp console=ttyAMA0 mem=256M earlyprintk"
# Vexpress, with initrd:
# KCMD = "console=ttyAMA0 mem=512M mem=512M@0x880000000 earlyprintk ip=192.168.27.200::192.168.27.1:255.255.255.0:angstrom:eth0:off"
# VExpress, without initrd:
KCMD ?= "console=ttyAMA0 mem=512M mem=512M@0x880000000 earlyprintk root=/dev/nfs nfsroot=172.31.252.250:/srv/arm-oneiric-root,tcp rw ip=dhcp nfsrootdebug"
MONITOR = monitor.S
BOOTLOADER = boot.S
KERNEL_SRC = ../linux-kvm-arm
KERNEL = uImage
IMAGE = linux-system.axf
LD_SCRIPT = model.lds.S
CROSS_COMPILE ?= arm-unknown-eabi-
ARCH ?= arm
CC = $(CROSS_COMPILE)gcc
LD = $(CROSS_COMPILE)ld
# These are needed by the underlying kernel make
export CROSS_COMPILE ARCH
all: $(IMAGE)
clean:
rm -f $(IMAGE) boot.o model.lds monitor.o uImage
$(KERNEL): $(KERNEL_SRC)/arch/arm/boot/uImage
cp $< $@
$(IMAGE): boot.o monitor.o model.lds $(KERNEL) $(FILESYSTEM) Makefile
$(LD) -o $@ --script=model.lds
boot.o: $(BOOTLOADER)
$(CC) $(CPPFLAGS) -DKCMD='$(KCMD)' -c -o $@ $<
monitor.o: $(MONITOR)
$(CC) $(CPPFLAGS) -c -o $@ $<
model.lds: $(LD_SCRIPT) Makefile
$(CC) $(CPPFLAGS) -E -P -C -o $@ $<
$(KERNEL_SRC)/arch/arm/boot/uImage: force
$(MAKE) -C $(KERNEL_SRC) -j4 uImage
# Pass any target we don't know about through to the kernel makefile.
# This is a convenience rule so we can say 'make menuconfig' etc here.
%: force
$(MAKE) -C $(KERNEL_SRC) $@
force: ;
Makefile: ;
.PHONY: all clean
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