Migration and debugging of Android system ---> detailed appreciation of build. Prop File

TIPS: What is build. Prop? /System/build. Prop is an attribute file. In Android, The. Prop file is very important and records system settings and changes, similar to files in/etc. How is this file generated?

Build/tools/buildinfo. the sh script is used to generate a build. use build/tools/buildinfo in the prop file build/CORE/makefile. sh script to generate build. prop file, and the default system. prop and customized system. append the settings in prop to build. some device-related configurations are appended to build in the prop file. prop

The code for build. Prop is as follows:

# Begin build properties # start to set system performance # autogenerated by buildinfo. sh # the following content is automatically generated by the script during compilation. build. id = jro03c # Build ID, which is usually generated during compilation without modifying Ro. build. display. TBDG1073-eng 4.1.1 jro03c 20130723. v016 test-keys # The ID displayed, which can be changed as any version Ro of the mobile phone information. build. version. incrementally = 20130723. v016 # version added instructions, generally do not show and there is no need to modify Ro. build. version. SDK = 16 # do not modify the version of the SDK used during system compilation. ro. build. version. codename = rel # version encoding name. Generally, you do not need to modify Ro if it is not displayed. build. version. release = 4.1.1 # The published version is displayed as the system version of mobile phone information Ro. build. date = Tue Jul 23 17:14:43 CST 2013 # system Compilation Time, no need to modify Ro. build. date. UTC = 1374570883 # system Compilation Time (digital version), no need to modify Ro. build. type = ENG # system compilation type. Generally, you do not need to display or modify Ro. build. user = PYou # system user name, which can be changed to your own name Ro. build. host = roco-Ubuntu # System host name, which can be any name. The English letter is Ro. build. tags = test-keys # system tag, meaningless, do not modify Ro. product. model = tbdg1073_ouyangpeng # the model of the machine. product. brand = tbdg1073 # machine brand, create Ro with you. product. name = tbdg1073 # Name of the machine, create Ro with you. prod UCT. device = tbdg1073 # device name. Create Ro with you. product. board = tbdg1073 # motherboard name, create RO as you like. product. CPU. abi = armeabi-v7a # CPU, it is best not to modify, to avoid some software in the identification of the machine, appear disorder Ro. product. CPU. abi2 = armeabi # CPU brand Ro. product. manufacturer = tbdg1073 # manufacturer, create Ro with you. product. locale. language = EN # System Language Ro. product. locale. region = us # region of the system Ro. wiFi. channels = 11 # communication channel of the Wireless Local Area Network. Blank indicates automatic identification of Ro. board. platform = meson6 # Main Board System # Ro. build. product is obsolete; Use Ro. product. devicero. build. PR Oduct = tbdg1073 # The device name is discarded and it is useless to modify it. # Do not try to parse Ro. build. description or. fingerprint # Do not try to modify Ro in the following content. build. description = TBDG1073-eng 4.1.1 jro03c 20130723. v016 test-keys # Your keyro. build. fingerprint = tbdg1073/tbdg1073/tbdg1073: 4.1.1/jro03c/20130723. v016: Eng/test-keys # body code Ro. build. characteristics = tablet # End build properties # End of attribute creation # system. prop For M1 reference board # system technical support provided by M1 # This overrides Settin GS in the products/generic/system. prop file # rild. libpath =/system/lib/libreference-ril.so # rild. libargs =-D/dev/ttys0ro. SF. LCD _density = 120 # display resolution. The larger the value, the higher the Resolution, the lower the keyguard. no_require_sim = 1 # mobile phones can be operated without a SIM card # Set fontro. fontscale = 1.0 # font size scaling # Set keyguard. enable = false to disable keyguardkeyguard. enable = true # lock screen Ro. statusbar. widget = truero. statusbar. button = truero. statusbar. yearmonthdayweek = true # wifi. interface = ra0 # WiFi Interface # Time Between scans in seconds. keep it high to minimize battery drain. # This only affects the case in which there are remembered access points, # But none are in range. # WiFi. supplicant_scan_interval = 60 # Wi-Fi scan interval, which is set to 45 seconds. Set the duration to reduce power consumption # ALSA. mixer. playback. master = dac2 analog # ALSA. mixer. capture. master = analog # configure the Dalvik heap for a standard tablet device. # frameworks/base/build/tablet-dalvik-heap.mkdalvik.vm.heapstartsize = 5 m # The initial memory Dalvik assigned by a single application. VM. heapgrowthlimit = 48 m # maximum memory limit for a single application. If the maximum memory limit is exceeded, it will be killed. This may be the cause of the crash of some large-volume programs, Dalvik. VM. heapsize = 256 m # virtual memory size of Dalvik hwui. render_dirty_regions = false # disable UN-supported Android featurehw. Nopm = falsehw. nobattery = falsehw. nophone = truehw. novibrate = truehw. cameras = 1hw. hasethernet = false # HW. hasdata = truero. platform. has. touch = truehw. nodatausage = true # Wi-Fi sleep policyro. platform. has. sleeppolicy = false # set to 0 temporarily so touch works without other changesro. SF. hwrotation = 270 #0, automatic screen conversion #0 ~ 7 you are required to get the correct install direction according the sensor placement on target board # Ro. SF. gsensorposition = 6ro. SF. ecompassposition = 4allow_all_orientations = 1 # Set camera orientationro. camera. orientation. front = 270ro. camera. orientation. back = 90 # Use osd2 mouse patchro. UI. cursor = osd2ro. hardware = amlogic # enable 32-bit osdsys. FB. bits = 32 # disable gpsgps. enable = false # enable player route 5_stretch = truemedia. libplayer. fastswitch = 0media. libplayer. required 4only = 1media. amplayer. dsource4local = 1 # media. amplayer. hdmicloseauthen = 1media. amplayer. delaybuffering = 2media. amplayer. buffertime = 5media. amplayer. v4osd. enable = 1media. arm. audio. decoder = ape # Fix doubletwist APK can not play radiomedia. player. forcemp3softdec = true # Fix online video block issuelibplayer. livets. softdemux = 1libplayer. netts. recalcpts = 1 # NAND write need force sync when gadgetgadget. nand. force_sync = true # status bar customizationro. statusbar. widget. power = truero. statusbar. yearmonthdayweek = true # HDMI # Ro. hdmi480p. enable = true # RW. FB. need2xscale = OK # media. amplayer. osd2xenable = true # camera dcim dir. 0: SD only; 1: NAND only; 2, SD firstro. camera. dcim = 1 # disable preload-classro.amlogic.no.preloadclass = 0 # app optimizationro. app. optimization = truepersist. SYS. timezone = America/new_york # force time zone, which is the New York time of America # dual displayro. vout. dualdisplay3 = truero. vout. player. exit = false # CPU settingsro. has. CPU. setting = true # CPU freq customized in setting menu # normal, performance, powersavingro. cpumode. maxfreq = 1200000,1320000, 800000 # When USB storage, CPU mode and freqro. USB storage. cpumode = performancero. USB storage. maxfreq = 600000ro. bootanimation. rotation = 0 # used to set default surface size, set 1 when hwrotation is 270, Set 3 when hwrotation is 90; need set Ro. bootanimation. rotation 0; debug. default. dimention = 1 # support media poll uevent, can use SD cardread on USB porthas. media. poll = true # used forward seek for libplayermedia. libplayer. seek. fwdsearch = 1 # For tabletui displayro. UI. tabletui = true # enable address bar cover issue fixingro. flashplayer. surfacehack = 1 # Add vol button in statusbar. ro. statusbar. volume = truero. screen. has. USB storage = truehw. erase. internalsdcard = true # media partition namero. media. partition. label = ouyangpeng # usb pid and vid name # Ro. USB. vendor. string = AML # Ro. USB. product. string = mid # CTS # media. amplayer. widevineenable = true # media. amplayer. dsource4local = truero.com. google. gmsversion = 4.1 _ r5ro.com. google. clientidbase = Android-FIH # Google customer ID Ro. setupwizard. mode = optional # The account setting wizard appears when the Installation Wizard is started. enabled indicates display, disabled indicates disabled, and optional indicates optional Ro. statusbar. screenshot = true # additional_build_properties # ro.com. android. dateformat = mm-dd-yyyy # The default ringtone. Place the corresponding ringtone in the/system/Media/Audio/ringtones file. ro.config.icationication_sound?pixiedust.ogg # The default tone, the file is in the/system/Media/Audio/events Events # default alert. The file is in the/system/Media/Audio/alarms directory. service. enabled = truero. setupwizard. mode = optional # Use the setup wizard ro.com when starting the instance by default. google. gmsversion = 4.1 _ r4ro. kernel. android. checkjni = 1net. BT. name = Android # name displayed in the Bluetooth Network. You can modify Dalvik. VM. stack-trace-file =/data/ANR/traces.txt

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