编译android源码官方教程(5)编译完之后刷机、编译fastboot
Running Builds
This page provides details for running builds on specific devices and is designed to complement the information in Building the System.
2.Building fastboot and adb
If you don't already have fastboot and adb, you can build them with the regular build system. Use the instructions in Building a System and replace the main make command with:
$ make fastboot adb
3.Booting into fastboot mode
During a cold boot of a device, use the following key combinations to boot into fastboot mode, which is a mode in the bootloader that can be used to flash the device:
| Device | Keys |
|---|---|
| hikey | Link pins 1 - 2 and 5 - 6 of J15 |
| angler | Press and hold Volume Down, then press and hold Power |
| bullhead | Press and hold Volume Down, then press and hold Power |
| shamu | Press and hold Volume Down, then press and hold Power |
| fugu | Press and hold Power |
| volantis | Press and hold Volume Down, then press and hold Power |
| hammerhead | Press and hold both Volume Up and Volume Down, then press and hold Power |
| flo | Press and hold Volume Down, then press and hold Power |
| deb | Press and hold Volume Down, then press and hold Power |
| manta | Press and hold both Volume Up and Volume Down, then press and hold Power |
| mako | Press and hold Volume Down, then press and hold Power |
| grouper | Press and hold Volume Down, then press and hold Power |
| tilapia | Press and hold Volume Down, then press and hold Power |
| phantasm | Power the device, cover it with one hand after the LEDs light up and until they turn red |
| maguro | Press and hold both Volume Up and Volume Down, then press and hold Power |
| toro | Press and hold both Volume Up and Volume Down, then press and hold Power |
| toroplus | Press and hold both Volume Up and Volume Down, then press and hold Power |
| panda | Press and hold Input, then press Power |
| wingray | Press and hold Volume Down, then press and hold Power |
| crespo | Press and hold Volume Up, then press and hold Power |
| crespo4g | Press and hold Volume Up, then press and hold Power |
You can also use the command adb reboot bootloader to reboot from Android directly into the bootloader with no key combinations.
4.Unlocking the bootloader
It's possible to flash a custom system only if the bootloader allows it, and the bootloader is locked by default. You can unlock the bootloader, but be aware that doing so deletes the user data for privacy reasons (the unlock operation needs to run only once). After unlocking, all data on the device is erased, i.e. both the applications' private data and the shared data that is accessible over USB, including photos and movies. Be sure to back up any precious files before unlocking the bootloader.
With the device in fastboot mode, unlock the bootloader using:
$ fastboot oem unlock
The procedure must be confirmed on-screen.
On Nexus 10, after unlocking the bootloader, the internal storage remains unformatted. You can format the device using:
$ fastboot format cache
$ fastboot format userdata
To re-lock the bootloader, use:
$ fastboot oem lock
Note: Re-locking the bootloading on a Motorola Xoom erases user data (including the shared USB data).
5.Using Flash Unlock
Android 7.0 introduces a new system API, getFlashLockState(), to transmit bootloader state.
Android 7.0 added the following system API that returns the bootloader’s lock status on compliant devices:
PersistentDataBlockManager.getFlashLockState()
| Return value | Conditions |
|---|---|
FLASH_LOCK_UNKNOWN |
Returned only by devices upgrading to Android 7.0 that have not supported bootloader changes required to get the flash lock status if they support flashing lock/unlock capability.
New Android 7.0 devices must be in either |
FLASH_LOCK_LOCKED |
Should be returned by any device that does not support flashing lock/unlock (i.e. the device is always locked), or any device that does support flashing lock/unlock and is in the locked state. |
FLASH_LOCK_UNLOCKED |
Returned by any device that supports flashing lock/unlock and is currently in the unlocked state. |
5.1 Examples and source
In the Android 7.0 release, the Android Open Source Project (AOSP) contains a reference implementation that returns a value based on the ro.boot.flash.locked boot property.
The code lives in:
frameworks/base/services/core/java/com/android/server/PersistentDataBlockService.java
frameworks/base/core/java/android/service/persistentdata/PersistentDataBlockManager.java
5.2 Validation
Manufacturers should test the values returned by devices with locked and unlocked bootloaders.
6.Selecting a device build
The recommended builds for devices are available from the lunch menu, accessed when running the lunchcommand with no arguments. You can download factory images and binaries for Nexus devices from developers.google.com:
- Preview binaries (blobs)
- Factory images for released devices
- Support binaries (drivers) for release devices
See Obtaining proprietary binaries for more details and Device binaries requirements for other resources.
| Device | Code name | Build configuration |
|---|---|---|
| HiKey | hikey | hikey-userdebug |
| Nexus 6P | angler | aosp_angler-userdebug |
| Nexus 5X | bullhead | aosp_bullhead-userdebug |
| Nexus 6 | shamu | aosp_shamu-userdebug |
| Nexus Player | fugu | aosp_fugu-userdebug |
| Nexus 9 | volantis (flounder) | aosp_flounder-userdebug |
| Nexus 5 (GSM/LTE) | hammerhead | aosp_hammerhead-userdebug |
| Nexus 7 (Wi-Fi) | razor (flo) | aosp_flo-userdebug |
| Nexus 7 (Mobile) | razorg (deb) | aosp_deb-userdebug |
| Nexus 10 | mantaray (manta) | full_manta-userdebug |
| Nexus 4 | occam (mako) | full_mako-userdebug |
| Nexus 7 (Wi-Fi) | nakasi (grouper) | full_grouper-userdebug |
| Nexus 7 (Mobile) | nakasig (tilapia) | full_tilapia-userdebug |
| Galaxy Nexus (GSM/HSPA+) | yakju (maguro) | full_maguro-userdebug |
| Galaxy Nexus (Verizon) | mysid (toro) | aosp_toro-userdebug |
| Galaxy Nexus (Experimental) | mysidspr (toroplus) | aosp_toroplus-userdebug |
| PandaBoard (Archived) | panda | aosp_panda-userdebug |
| Motorola Xoom (U.S. Wi-Fi) | wingray | full_wingray-userdebug |
| Nexus S | soju (crespo) | full_crespo-userdebug |
| Nexus S 4G | sojus (crespo4g) | full_crespo4g-userdebug |
Note: Do not use Android 4.1.1 on a Nexus 7 originally sold with Android 4.1.2 or newer.
7.Flashing a device
You can flash an entire Android system in a single command; doing so verifies the system being flashed is compatible with the installed bootloader and radio, writes the boot, recovery, and system partitions together, and then reboots the system. Flashing also erases all user data, similarly to fastboot oem unlock.
Place the device in fastboot mode either manually by holding the appropriate key combination at boot, or from the shell with:
$ adb reboot bootloader
Once the device is in fastboot mode, run:
$ fastboot flashall -w
The -w option wipes the /data partition on the device; this is useful for your first time flashing a particular device but is otherwise unnecessary.
Note: Filesystems created via fastboot on Motorola Xoom do not function optimally. We recommend re-creating filesystems through recovery, using: $ adb reboot recovery. While in recovery, open the menu (press Power + Volume Up), wipe the cache partition, then wipe data.
8.Restoring devices to factory state
Factory images for Nexus 5, Nexus 10, Nexus 4, Nexus Q, Nexus 7, Galaxy Nexus (GSM/HSPA+ "yakju" and "takju", and CDMA/LTE "mysid" and "mysidspr"), Nexus S, and Nexus S 4G are available from Google's factory image page.
Factory images for the Motorola Xoom are distributed directly by Motorola.
