Onnowpurbo at 22:50, 30 December 2014

2014-12-30T22:50:10Z

Onnowpurbo: /* Referensi */

2014-12-30T22:47:30Z

Referensi

← Older revision		Revision as of 22:47, 30 December 2014
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	MTK Kernel Builder		MTK Kernel Builder

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	* http://hubeihuyanwei.blog.163.com/blog/static/28205284201282444441662/		* http://hubeihuyanwei.blog.163.com/blog/static/28205284201282444441662/
			* https://www.facebook.com/androidevn/posts/823618704330578

Onnowpurbo: New page: MTK Kernel Builder 2012-09-24 16:44:41| 分类： Android | 标签：kernel android makefile |举报 |字号订阅 KConfig 流程关心点1： kernel builder: @makeMtk make ...

2014-12-30T22:45:01Z

New page: MTK Kernel Builder 2012-09-24 16:44:41| 分类： Android | 标签：kernel android makefile |举报 |字号订阅 KConfig 流程关心点1： kernel builder: @makeMtk make ...

New page

MTK Kernel Builder

2012-09-24 16:44:41| 分类： Android | 标签：kernel android makefile |举报 |字号订阅
KConfig 流程
关心点1：
kernel builder:
@makeMtk
make -f mediatek/build/makemtk.mk kernel

@mediatek/build/makemtk.mk
kernel/build.sh

@kernel/build.sh
make mediatek-configs
nice make ${makeflags} ${makedefs} silentoldconfig
make ${makeflags} ${makejobs} ${makedefs}

mediatek-configs 目标是怎么回事? 原来：
@kernel/Makefile
include $(srctree)/arch/$(SRCARCH)/Makefile
@kernel/arch/arm/Makefile
include ../mediatek/build/kernel/Makefile
@mediatek/build/kernel/Makefile
.config mediatek-configs: $(MTK_ROOT_GEN_CONFIG)/kconfig $(MTK_ROOT_GEN_CONFIG)
@echo "[COPY] $< --> $@"
@cp $< $@
@echo "[COPY] $< --> .config"
@cp $< .config

@kernel/Kconfig
source "arch/$SRCARCH/Kconfig"
@alps/kernel/arch/arm/Kconfig
source "../mediatek/source/kernel/Kconfig"
@alps/mediatek/source/kernel/Kconfig
31 if ARCH_MT6573
32 source "../mediatek/platform/mt6573/kernel/Kconfig/Kernel"
33 source "../mediatek/platform/mt6573/kernel/Kconfig/Board"
34 source "../mediatek/platform/mt6573/kernel/Kconfig/Drivers"
35 endif

@mediatek/platform/mt6573/kernel/Kconfig/Drivers
34 # Frame Buffer Related
35 menuconfig MTK_FB # FB_MT6516 FB_MT6573
36 bool "MediaTek Framebuffer Driver"
37 depends on FB
38 select FB_CFB_FILLRECT
39 select FB_CFB_COPYAREA
40 select FB_CFB_IMAGEBLIT
41 select FB_SOFT_CURSOR
42 ---help---
43 This selects the MediaTek(R) frame buffer driver.
44 If you want to use MediaTek(R) frame buffer diver, say Y here.
45 If unsure, say N.

关心点2：
menuconfig是从哪里来？这样解释：

@alps/kernel/Makefile
%config: scripts_basic outputmakefile FORCE
$(Q)mkdir -p include/linux include/config
$(Q)$(MAKE) $(build)=scripts/kconfig $@

关于最后的一条命令：我打印出来是这样的效果:
make -f scripts/Makefile.build obj=scripts/kconfig menuconfig

不知道$(build)变量是怎么计算出来的，后来发现是这样的：
@kernel/Makefile
329 include $(srctree)/scripts/Kbuild.include

@kernel/scripts/Kbuild.include
156 ###
157 # Shorthand for $(Q)$(MAKE) -f scripts/Makefile.build obj=
158 # Usage:
159 # $(Q)$(MAKE) $(build)=dir
160 build := -f $(if $(KBUILD_SRC),$(srctree)/)scripts/Makefile.build obj

这样，就解析出来了上面的东西，

@kernel/scripts/Makefile.build
41 # The filename Kbuild has precedence over Makefile
42 kbuild-dir := $(if $(filter /%,$(src)),$(src),$(srctree)/$(src))
43 kbuild-file := $(if $(wildcard $(kbuild-dir)/Kbuild),$(kbuild-dir)/Kbuild,$(kbuild-dir)/Makefile)
44 include $(kbuild-file)
这样就将 kernel/scripts/kconfig/Makefile 包含进去了。
查看文件 kernel/scripts/kconfig/Makefile 也就不用我多说了：
@scripts/kconfig/Makefile
xconfig: $(obj)/qconf
$< $(Kconfig)

gconfig: $(obj)/gconf
$< $(Kconfig)

menuconfig: $(obj)/mconf
$< $(Kconfig)

config: $(obj)/conf
$< --oldaskconfig $(Kconfig)

nconfig: $(obj)/nconf
$< $(Kconfig)

oldconfig: $(obj)/conf
$< --$@ $(Kconfig)

silentoldconfig: $(obj)/conf
$(Q)mkdir -p include/generated
$< --$@ $(Kconfig)
cp -f include/generated/autoconf.h include/linux/autoconf.h

关心点3：
.config 文件最终还会被更新一次：查看kernel log
[COPY] ../mediatek/config/out/s816_bef/autoconfig/kconfig --> mediatek-configs
[COPY] ../mediatek/config/out/s816_bef/autoconfig/kconfig --> .config
HOSTCC scripts/kconfig/conf.o
SHIPPED scripts/kconfig/zconf.tab.c
SHIPPED scripts/kconfig/lex.zconf.c
SHIPPED scripts/kconfig/zconf.hash.c
HOSTCC scripts/kconfig/zconf.tab.o
HOSTLD scripts/kconfig/conf
scripts/kconfig/conf --silentoldconfig Kconfig
#
# configuration written to .config
#
cp -f include/generated/autoconf.h include/linux/autoconf.h

看kernel config 的程序 scripts/kconfig/conf 里面的代码有：
scripts/kconfig/confdata.c:66: char *name = getenv("KCONFIG_CONFIG");
而@Makefile
240:KCONFIG_CONFIG ?= .config
export KCONFIG_CONFIG
可以获知这样的信息。

mediatek/config/out/s816_bef/autoconfig/kconfig: mediatek/config/mt6575/autoconfig/kconfig/platform

mediatek/config/common/autoconfig/kconfig/AEE mediatek/config/s816_bef/autoconfig/kconfig/project

mediatek/config/out/s816_bef/autoconfig
@echo "[CONFIG] generate mediatek/config/out/s816_bef/autoconfig/kconfig"
@cat mediatek/config/mt6575/autoconfig/kconfig/platform mediatek/config/common/autoconfig/kconfig/AEE

mediatek/config/s816_bef/autoconfig/kconfig/project | python mediatek/build/tools/config/merge-kconfig.py >

mediatek/config/out/s816_bef/autoconfig/kconfig

查了一下应该是：
define .mtk.config.generate-auto-merge-rules
.PHONY: mediatek-configs.$(1)
mediatek-configs: mediatek-configs.$(1)
mediatek-configs.$(1): $(2)
$(2): PRIVATE_FILE_LIST := $(3)
$(2): $(3) $(4)
@echo "[CONFIG] generate $(2)"
@cat $(3) | $(5) > $(2)
endef

应该是这样类似的$(call .mtk.config.generate-auto-merge-rules,kconfig,xx.xx.xx)
更有可能是这样的：$(call .mtk.config.generate-auto-rules,xx,xx,xx)
这个就要自己去验证了。

==Referensi==

* http://hubeihuyanwei.blog.163.com/blog/static/28205284201282444441662/

ROM Android: Compile Kernel untuk MediaTek - Revision history

Onnowpurbo at 22:50, 30 December 2014

Onnowpurbo: /* Referensi */

Onnowpurbo: New page: MTK Kernel Builder 2012-09-24 16:44:41| 分类： Android | 标签：kernel android makefile |举报 |字号 订阅 KConfig 流程 关心点1： kernel builder: @makeMtk make ...

Onnowpurbo: New page: MTK Kernel Builder 2012-09-24 16:44:41| 分类： Android | 标签：kernel android makefile |举报 |字号订阅 KConfig 流程关心点1： kernel builder: @makeMtk make ...