Android源码编译(6)---选择设备

Selecting Devices

IN THIS DOCUMENT

HiKey boards
Running Android on HiKey

Compiling userspace
Installing initial
fastboot and ptable
Flashing images
Building the kernel
Setting monitor resolution
Configuring kernel serial
output (uart3)

You can create builds for Nexus devices using Android Open Source Project (AOSP) builds and the relevant hardware-specific binaries. For available Android builds and targeted Nexus devices, see Source
Code, Tags, and Builds.

Note: Due to hardware differences, do not use Android 4.1.1 on a Nexus 7 originally sold with Android 4.1.2 or newer.
You can also create builds for the HiKey Android reference
board (described below). Reference boards are designed to help non-Nexus component vendors develop and port drivers to Android releases. Using a reference board can ease upgrade efforts, reduce time-to-market for new Android devices, lower device costs by
enabling ODM/OEMs to choose from a wider range of compatible components, and increase the speed of innovation among component suppliers.

HiKey boards

Google supports HiKey, a certified 96Board,
as an Android reference board. AOSP provides kernel source and board support for HiKey to enable developers to easily create and debug new and existing peripheral drivers, do kernel development, and perform other tasks with fewer OEM encumbrances.
HiKey boards are available in 1GB RAM and 2GB
RAM configurations from Lenovator:



Figure 1. HiKey board by Lenovator
Additional resources:

HiKey schematics
HiKey User Guide
HiKey wiki

Running Android on HiKey

Use the following commands to download, build, and run Android on a HiKey board.

Compiling userspace

Download the Android source tree:

$ repo init -u https://android.googlesource.com/platform/manifest -b master

$ repo sync -j24

Download and extract HDMI binaries into the Android source tree:

$ wget https://dl.google.com/dl/android/aosp/linaro-hikey-20160226-67c37b1a.tgz

$ tar xzf linaro-hikey-20160226-67c37b1a.tgz

$ ./extract-linaro-hikey.sh

Install mcopy utility:

$ apt-get install mtools

Build:

$ . ./build/envsetup.sh

$ lunch hikey-userdebug

$ make -j32

Note: For 4GB eMMC, instead of

$ make -j32

use:

$ make -j32 TARGET_USERDATAIMAGE_4GB=true

.

Installing initial fastboot and ptable

Select special bootloader mode by linking J15 1-2 and 3-4 pins (for details, refer to the HiKey
User Guide).
Connect USB to PC to get ttyUSB device (ex:

/dev/ttyUSB1

).
Power the board:

$ cd device/linaro/hikey/installer

$ ./flash-all.sh /dev/ttyUSB1 [4g]

Remove jumper 3-4 and power the board.

Flashing images

Enter fastboot mode by linking J15 1-2 and 5-6 pins.
Run the following commands:

$ fastboot flash boot out/target/product/hikey/boot.img

$ fastboot flash -w system out/target/product/hikey/system.img

Remove jumper 5-6 and power the board.

Building the kernel

Run the following commands:

$ git clone https://android.googlesource.com/kernel/hikey-linaro

$ cd hikey-linaro

$ git checkout -b android-hikey-linaro-4.4 origin/android-hikey-linaro-4.4

$ make ARCH=arm64 hikey_defconfig

$ make ARCH=arm64 CROSS_COMPILE=aarch64-linux-android- -j24

Copy output to the hikey kernel directory (

/kernel/hikey-linaro

):

Copy hi6220-hikey.dtb (

arch/arm64/boot/dts/hisilicon/hi6220-hikey.dtb

) to the hikey-kernel directory.
Copy the Image file

(arch/arm64/boot/Image-dtb

) to the hikey-kernel directory.
Make the boot image:

$ make bootimage -j24

Setting monitor resolution

Edit

device/linaro/hikey/BoardConfig.mk

parameter

BOARD_KERNEL_CMDLINE

and
configure the

video

setting. Example setting for a 24" monitor:

video=HDMI-A-1:1280x800@60

.

Configuring kernel serial output (uart3)

Set the J2 low speed expansion connector to 1 - Gnd, 11 - Rx, 13 - Tx . For details, refer to the HiKey
User Guide).