Makefile

# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
#      http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
#
# Hacked up a simple Makefile for the XT890 Kernel, this has a lot of optimized
# flags and went a little extreme on specifying the flags since this is for a 
# remote compile target.
#
#                                               Mar 2013 - Omar Avelar
#

############################################################################
########################## GLOBAL MAKE ARGUMENTS ###########################
############################################################################

export ARCH := i386
#export CROSS_COMPILE := $(PWD)/gcc/i686-linux-android-4.7/bin/i686-linux-android-
export KBUILD_VERBOSE := 0

############################################################################
##################### LOCAL SETUP AND FILE STRUCTURES ######################
############################################################################

KVERSION = linux-3.0
KDEFCONFIG = i386_mfld_oxavelar_defconfig
KSRC_PATH = $(PWD)/kernel/$(KVERSION)
WL12XX_SRC_PATH = $(PWD)/hardware/ti/wlan/wl12xx-compat
OUT_PATH = $(PWD)/out
KBUILD_OUT_PATH = $(OUT_PATH)/kbuild
MBUILD_OUT_PATH = $(OUT_PATH)/mbuild

############################################################################
#################### KERNEL OPTIMIZATION FLAGS FOR THE ATOM ################
############################################################################

export ANDROID_TOOLCHAIN_FLAGS := \
        -pipe \
        -flto \
        -mno-android \
        -O2 \
        -march=atom \
        -msse2 \
        -msse3 \
        -mssse3 \
        -mpclmul \
        -mcx16 \
        -msahf \
        -mmovbe \
        -mfancy-math-387 \
        -ftree-vectorize \
        -funswitch-loops \
        -fpredictive-commoning \
        -fgcse-after-reload \
        -fexcess-precision=fast \
        -floop-block \
        --param loop-block-tile-size=512 \
        -floop-interchange \
        -floop-strip-mine \
        -fgraphite-identity \
        -floop-parallelize-all \
        -ftree-loop-im \
        -ftree-parallelize-loops=2 \
        -ftree-loop-if-convert \
        -ftree-loop-if-convert-stores \
        -fomit-frame-pointer \
        -foptimize-register-move \
        -fmodulo-sched \
        -fmodulo-sched-allow-regmoves \
        --param l1-cache-line-size=64 \
        --param l1-cache-size=24 \
        --param l2-cache-size=512 \

# The following modules have problems with -ftree-vectorize
# and if removed will get battery reading errors
export CFLAGS_platform_max17042.o           := -fno-tree-vectorize
export CFLAGS_max17042_battery.o            := -fno-tree-vectorize
export CFLAGS_intel_mdf_battery.o           := -fno-tree-vectorize

############################################################################
########################### KERNEL BUILD STEPS #############################
############################################################################

BOOT_CMDLINE="init=/init pci=noearly console=logk0 vmalloc=256M earlyprintk=nologger hsu_dma=7 kmemleak=off androidboot.bootmedia=sdcard androidboot.hardware=sc1 emmc_ipanic.ipanic_part_number=6 loglevel=4 zram.num_devices=2"

.PHONY: bootimage
bootimage: kernel modules
	rm -fR /tmp/smi-ramdisk
	cp -R $(PWD)/root /tmp/smi-ramdisk
	mkdir -p /tmp/smi-ramdisk/lib/modules
	# Copy the created modules to the ramdisk path and strip debug symbols
	find $(MBUILD_OUT_PATH) -iname *.ko -exec cp -f \{\} /tmp/smi-ramdisk/lib/modules/ \;
	find $(WL12XX_SRC_PATH) -iname *.ko -exec cp -f \{\} /tmp/smi-ramdisk/lib/modules/ \;
	strip --strip-debug --strip-unneeded /tmp/smi-ramdisk/lib/modules/*.ko
	$(PWD)/tools/pack-ramdisk /tmp/smi-ramdisk
	mv /tmp/ramdisk.cpio.gz $(OUT_PATH)/ramdisk.cpio.gz
	# Pack the boot.img
	$(PWD)/tools/mkbootimg --kernel $(OUT_PATH)/kernel \
	 --ramdisk $(OUT_PATH)/ramdisk.cpio.gz             \
	 --cmdline $(BOOT_CMDLINE) --output $(PWD)/out/

.PHONY: kernel
kernel:
	mkdir -p $(KBUILD_OUT_PATH)
	$(MAKE) -C $(KSRC_PATH) O=$(KBUILD_OUT_PATH) $(KDEFCONFIG)
	$(MAKE) -C $(KSRC_PATH) O=$(KBUILD_OUT_PATH) bzImage
	cp $(KBUILD_OUT_PATH)/arch/x86/boot/bzImage $(OUT_PATH)/kernel

.PHONY: modules
modules:
	# General modules from the kernel
	mkdir -p $(MBUILD_OUT_PATH)
	$(MAKE) -C $(KSRC_PATH) O=$(MBUILD_OUT_PATH) $(KDEFCONFIG)
	$(MAKE) -C $(KSRC_PATH) O=$(MBUILD_OUT_PATH) ANDROID_TOOLCHAIN_FLAGS+="-fno-lto -fno-tree-vectorize" modules
	# Wireless modules
	cd $(WL12XX_SRC_PATH); scripts/driver-select wl12xx
	$(MAKE) -C $(WL12XX_SRC_PATH) KLIB=$(MBUILD_OUT_PATH) KLIB_BUILD=$(MBUILD_OUT_PATH) ANDROID_TOOLCHAIN_FLAGS+="-fno-lto -fno-tree-vectorize"

.PHONY: clean
clean:
	$(MAKE) -C $(WL12XX_SRC_PATH) clean
	$(MAKE) -C $(KSRC_PATH) mrproper
	rm -rf $(PWD)/out