不同項(xiàng)目共用一個(gè)CPU等核心平臺(tái)，項(xiàng)目外圍有些差異，需要共用絕大部分代碼，比如我們基于高通msm8937 64位CPU開(kāi)發(fā)3款產(chǎn)品(每款產(chǎn)品定義為一個(gè)項(xiàng)目的體現(xiàn)形式)，我們用DEVELOP_PROJECT來(lái)記錄并區(qū)分，DEVELOP_PRODUCT對(duì)應(yīng)這3個(gè)項(xiàng)目的名稱(chēng)為evb(評(píng)估板)、ht_v8(手持機(jī)v8型號(hào)設(shè)備)，dr_v2(門(mén)禁設(shè)備V2型號(hào)設(shè)備)。

我們是基于msm8937_64上來(lái)擴(kuò)展為支持幾個(gè)項(xiàng)目共用一套代碼，為驗(yàn)證這套機(jī)制的基本實(shí)現(xiàn)，我們以修改“設(shè)置--->關(guān)于手機(jī)--->型號(hào)”來(lái)驗(yàn)證，這個(gè)對(duì)應(yīng)device\qcom\msm8937_64\msm8937_64.mk的PRODUCT_MODEL的值。其他部分的兼容性在此基礎(chǔ)上展開(kāi)。

查找包含msm8937_64的目錄

查找了device、system、hardware、vendor和build目錄

Msm8937下lk部分是對(duì)應(yīng)msm8952目錄，但lk目錄修改較少

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這里面的device/qcom/8937_64是針對(duì)8937 64位的，目錄如下：

我們是基于框CPU來(lái)開(kāi)發(fā)幾款產(chǎn)品，所以可以在此目錄下把共同部分保持原來(lái)的目錄結(jié)構(gòu)，產(chǎn)品可能不同的就放在新創(chuàng)建的對(duì)應(yīng)的目錄下，比如針對(duì)于evb(評(píng)估板)，我們?cè)赿evice\qcom\msm8937_64下新建device_evb文件夾，把差異性部分放在這里，其他產(chǎn)品類(lèi)似。

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編譯設(shè)置

先來(lái)看看高通默認(rèn)的編譯之前的操作配置

(1)?? source build/envsetup.sh

(2)?? lunch msm8937_64-userdebug

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2.1? source build/envsetup.sh

使當(dāng)前shell讀入build/envsetup.sh的shell文件并依次執(zhí)行文件中的所有語(yǔ)句，通常用于重新執(zhí)行剛修改的初始化文件，使之立即生效，而不必注銷(xiāo)并重新登錄

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打印的信息

WARNING: Only bash is supported, use of other shell would lead to erroneous results

including device/generic/mini-emulator-arm64/vendorsetup.sh

including device/generic/mini-emulator-armv7-a-neon/vendorsetup.sh

including device/generic/mini-emulator-x86_64/vendorsetup.sh

including device/generic/mini-emulator-x86/vendorsetup.sh

including device/qcom/common/vendorsetup.sh

including vendor/forge/vendorsetup.sh

fatal: Not a git repository (or any of the parent directories): .git

FORGE_VERSION ==> 1B62.XXXXXXX.180823.100.V01.T01

FORGE_AP_VERSION ==> SLM757MG_EQ0_XXXXXXX_180823_100_V01_T01

including vendor/qcom/proprietary/common/vendorsetup.sh

including sdk/bash_completion/adb.bash

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(1)?? 找出包含有vendorsetup.sh的文件并執(zhí)行

這來(lái)會(huì)找到并執(zhí)行其中的device\qcom\common\vendorsetup.sh，此sh相關(guān)的有

…

add_lunch_combo msm8937_32-userdebug

add_lunch_combo msm8937_64-userdebug

add_lunch_combo msm8953_32-userdebug

…

也就是調(diào)用add_lunch_combo這個(gè)函數(shù)，將各自產(chǎn)品添加到LUNCH_MENU_CHOICES變量中去。

(2)?? add_lunch_combo()

# Clear this variable.? It will be built up again when the vendorsetup.sh# files are included at the end of this file.unset LUNCH_MENU_CHOICESfunction add_lunch_combo(){local new_combo=$1local cfor c in ${LUNCH_MENU_CHOICES[@]} ; doif [ "$new_combo" = "$c" ] ; thenreturnfidoneLUNCH_MENU_CHOICES=(${LUNCH_MENU_CHOICES[@]} $new_combo)}這里重點(diǎn)

是收集所有的vendor清單，用echo ${LUNCH_MENU_CHOICES[@]}打印出來(lái)的值

aosp_arm-eng aosp_arm64-eng aosp_mips-eng aosp_mips64-eng aosp_x86-eng aosp_x86_64-eng mini_emulator_arm64-userdebug m_e_arm-userdebug mini_emulator_x86_64-userdebug mini_emulator_x86-userdebug msm8974-userdebug msm8610-userdebug msm8226-userdebug apq8084-userdebug mpq8092-userdebug msm_bronze-userdebug msm8916_32-userdebug msm8916_32_512-userdebug msm8916_32_k64-userdebug msm8916_64-userdebug msm8994-userdebug msm8996-userdebug msm8909-userdebug msm8909_512-userdebug msm8992-userdebug msm8952_64-userdebug msm8952_32-userdebug msm8937_32-userdebug?msm8937_64-userdebug?msm8953_32-userdebug msm8953_64-userdebug msm8998-userdebug msm8998_32-userdebug msmfalcon_64-userdebug msmfalcon_32-userdebug msmskunk-userdebug

(3)?? adb.bash

在sdk/bash_completion目錄下的adb.bash文件也會(huì)加載到當(dāng)前終端來(lái)，它是用來(lái)實(shí)現(xiàn)adb命令的bash completion功能的。也就是說(shuō)，加載了該文件之后，我們?cè)谶\(yùn)行adb相關(guān)的命令的時(shí)候，通過(guò)按tab鍵就可以幫助我們自動(dòng)完成命令的輸入。關(guān)于bash completion的知識(shí)，可以參考官方文檔：?http://www.gnu.org/s/bash/manual/bash.html#Programmable-Completion。

2.2? lunch msm8937_64-userdebug

說(shuō)明下，如果沒(méi)有前面的source build/envsetup.sh，將會(huì)提示-sh: lunch: command not found

輸出的信息

============================================

PLATFORM_VERSION_CODENAME=REL

PLATFORM_VERSION=7.1.1

TARGET_PRODUCT=msm8937_64

TARGET_BUILD_VARIANT=userdebug

TARGET_BUILD_TYPE=release

TARGET_BUILD_APPS=

TARGET_ARCH=arm64

TARGET_ARCH_VARIANT=armv8-a

TARGET_CPU_VARIANT=generic

TARGET_2ND_ARCH=arm

TARGET_2ND_ARCH_VARIANT=armv7-a-neon

TARGET_2ND_CPU_VARIANT=cortex-a53

HOST_ARCH=x86_64

HOST_2ND_ARCH=x86

HOST_OS=linux

HOST_OS_EXTRA=Linux-4.4.0-62-generic-x86_64-with-Ubuntu-16.04-xenial

HOST_CROSS_OS=windows

HOST_CROSS_ARCH=x86

HOST_CROSS_2ND_ARCH=x86_64

HOST_BUILD_TYPE=release

BUILD_ID=NMF26F

OUT_DIR=out

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(1)?? build_build_var_cache()

lunch()--->build_build_var_cache()

這里會(huì)執(zhí)行build/core/config.mk

(2)?? printconfig

lunch()--->printconfig()--->get_build_var()，此函數(shù)的參數(shù)是report_config，在core/dumpvar.mk中的print_build_config_vars對(duì)應(yīng)上面打印的信息，但他們的值怎來(lái)的呢

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(3)?? ?

2.3? ?

增加DEVELOP_PRODUCT記錄我們開(kāi)發(fā)的設(shè)備型號(hào)

，DEVELOP_PRODUCT對(duì)應(yīng)這3個(gè)項(xiàng)目的名稱(chēng)為evb(評(píng)估板)、ht_v8(手持機(jī)v8型號(hào)設(shè)備)，dr_v2(門(mén)禁設(shè)備V2型號(hào)設(shè)備)。

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3.1? DEVELOP_PRODUCT能夠手動(dòng)選擇并全局生效

手動(dòng)輸入，默認(rèn)為evb

要實(shí)現(xiàn)這個(gè)多產(chǎn)品選項(xiàng)

/build/envsetup.sh的lunch()調(diào)用新增的choose_develop_product()，如下：

PRODUCT_CHOICES=(evb ht_v8 dr_v2)# check to see if the supplied variant is validfunction check_develop_product(){for v in ${PRODUCT_CHOICES[@]}doif [ "$v" = "$1" ]thenreturn 0fidonereturn 1}function choose_develop_product(){echo $1T=$(gettop)echo "product choices are:"local index=1local vfor v in ${PRODUCT_CHOICES[@]}do# The product name is the name of the directory containing# the makefile we found, above.echo "???? $index. $v"index=$(($index+1))donelocal default_value=evblocal ANSWERexport DEVELOP_PRODUCT=while [ -z "$DEVELOP_PRODUCT" ]doecho -n "Which would you like? [$default_value] "if [ -z "$1" ] ; thenread ANSWERelseecho $1ANSWER=$1fiif [ -z "$ANSWER" ] ; thenexport DEVELOP_PRODUCT=$default_valueelif (echo -n $ANSWER | grep -q -e "^[0-9][0-9]*$") ; thenif [ "$ANSWER" -le "${#PRODUCT_CHOICES[@]}" ] ; thenexport DEVELOP_PRODUCT=${PRODUCT_CHOICES[$(($ANSWER-1))]}fielseif check_develop_product $ANSWERthenexport DEVELOP_PRODUCT=$ANSWERelseecho "** Not a valid project: $ANSWER"fifiif [ -n "$1" ] ; thenbreakfidone}function lunch(){local answerchoose_develop_product $2…}

3.2? 我們以修改“設(shè)置--->關(guān)于手機(jī)--->型號(hào)”來(lái)驗(yàn)證

這個(gè)對(duì)應(yīng)device\qcom\msm8937_64\msm8937_64.mk的PRODUCT_MODEL的值，默認(rèn)為

PRODUCT_MODEL := msm8937 for arm64

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實(shí)現(xiàn)這個(gè)驗(yàn)證的主要實(shí)現(xiàn)如下：

(1)?? 創(chuàng)建product_evb文件夾

在device\qcom\msm8937_64下創(chuàng)建product_evb文件夾

(2)?? product_evb文件夾創(chuàng)建msm8937_64_evb.mk文件

此文件下的內(nèi)容PRODUCT_MODEL := evb

(3)?? msm8937_64.mk把msm8937_64_evb.mk文件包含進(jìn)來(lái)

include device/qcom/msm8937_64/product_$(DEVELOP_PRODUCT)/msm8937_64_$(DEVELOP_PRODUCT).mk

這里用到了記錄產(chǎn)品型號(hào)的DEVELOP_PRODUCT變量。

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參考鏈接：

深入淺出 - Android系統(tǒng)移植與平臺(tái)開(kāi)發(fā)（十一）- Android系統(tǒng)的定制

https://blog.csdn.net/mr_raptor/article/details/30113417?readlog

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為android源碼添加新設(shè)備支持概述

https://blog.csdn.net/felix_wangq/article/details/49834207

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為android系統(tǒng)添加產(chǎn)品的過(guò)程

https://blog.csdn.net/getnextwindow/article/details/48158873

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Android 系統(tǒng)添加新項(xiàng)目及配置

https://blog.csdn.net/zhbpd/article/details/50274715

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msm8909+android5.1.1編譯前配置及增加新項(xiàng)目和產(chǎn)品所需分支

https://www.2cto.com/kf/201602/491312.html

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Android集成一個(gè)新產(chǎn)品時(shí)，lunch的product name和device name注意事項(xiàng)

https://www.2cto.com/kf/201512/454247.html

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