Build kernel for Nexus5x_nexus5x kernelsu-优快云博客

本文链接：https://blog.youkuaiyun.com/nevergefeizi/article/details/121189522

本文详细介绍了如何将Nexus5X解锁为开发者模式，启用OEM解锁和USB调试，进入 bootloader 模式并使用 fastboot 命令解锁设备。接着，通过下载源代码和交叉编译器来编译内核，插入自定义驱动，并生成新的 boot.img。文章还涵盖了如何处理verity_key以确保正确生成，并提供了生成 boot.img 的步骤。最后，通过 fastboot 闪存新内核，确保设备的安全启动。

摘要生成于 C知道，由 DeepSeek-R1 满血版支持，前往体验 >

Root Nexus5x（The following process is normally needed when you have a totally new phone）

1. settings->about phone -> Build number(click multiple times): it will indicate you are a developer

2. enable 'OEM unlock' -> makes the user able to flash boot img.

enable 'USB debuging' -> enable the adb

3. power off the phone, enter the boot loader mode(or #adb reboot-bootloader)

4. #fastboot oem unlock (if DEVICE STATE locked)

5.$PROJECT_PATH\Nexus5X\FactoryImage\image_usedebug\flash-all.bat

#adb root;

#adb disable-verity;

#adb reboot

Build kernel for Nexus5x

Download source code and the cross-compiler

Source code https://android.googlesource.com/kernel/msm/+refs

package: android-msm-bullhead-3.10-marshmallow-mr2

cross-compiler: aarch64-linux-android-4.9

Extract the kernel source code and cross-compiler to proper path.

2. Run scripts: build_kernel.sh, content as follow

export PATH=~/work/tools/aarch64_4.9/bin:$PATH

export ARCH=arm64

export CROSS_COMPILE=aarch64-linux-android-

make menuconfig bullhead_defconfig

make

3. Insert your driver into below folder:

bullhead_androidM/drivers/misc/

4. Use the original boot.img with scripts in /make_n5_rom/image_sdcard/creat-img.sh to generate the boot.img-ramdisk folder.

Make sure that below two instructions are not commented out in the creat-img.sh script.

./extract-kernel.pl boot.img

./extract-ramdisk.pl boot.img

This step is to make sure that the right verity_key in ramdisk is generated and used.

https://www.reddit.com/r/androiddev/comments/kfrabd/is_bootverity_key_still_used_in_android_verified/

5. Comment out ./extract-kernel.pl boot.img and ./extract-ramdisk.pl boot.img in /make_n5_rom/image_sdcard/creat-img.sh

6. Generat boot.img with scripts in /make_n5_rom/image_sdcard/creat-img.sh

7. Insert the i2c information in kernel: bullhead_androidM/arch/arm64/boot/dts/lge

msm8992-bullhead-misc.dtsi

8. Compile the kernel with build_kernel.sh

After you get Image.gz-dtb, then run the script:

make_N5x_rom/create_img.sh (this time you can comment out ./extract-kernel.pl boot.img

and ./extract-ramdisk.pl boot.img)

Then you can get boot.img

9. Bootloader mode: fastboot flash boot boot.img

(Replace kernel:

#fastboot boot boot.img ----àKernel will recover to old one when phone reboots

#fastboot flash boot boot.img ----àverified and flash boot.img)

PS: sometimes you host can not know the android device of Nexus5X even you have andriod device dirver. for this issue, you need to install an Qualcom driver since the AP of Nexus5X is Qualcom.