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101 lines
3.9 KiB
Markdown
101 lines
3.9 KiB
Markdown
# Android_boot_image_editor
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[](https://travis-ci.org/cfig/Android_boot_image_editor)
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[](http://www.apache.org/licenses/LICENSE-2.0.html)
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This tool focuses on editing Android boot.img(also recovery.img, recovery-two-step.img and vbmeta.img).
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## 1. Prerequisite
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#### 1.1 Host OS requirement:
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Linux or Mac.
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Also need python 2.x and jdk 8.
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#### 1.2 Target Android requirement:
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(1) Target boot.img MUST follows AOSP verified boot flow, either [Boot image signature](https://source.android.com/security/verifiedboot/verified-boot#signature_format) in VBoot 1.0 or [AVB HASH footer](https://android.googlesource.com/platform/external/avb/+/master/README.md#The-VBMeta-struct) in VBoot 2.0.
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Supported images:
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- boot.img
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- recovery.img
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- recovery-two-step.img
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- vbmeta.img
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(2) These utilities are known to work for Nexus/Pixel boot.img for the following Android releases:
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- AOSP master
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- Lollipop (5.0) - Q preview
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## 2. Usage
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Put your boot.img to current directory, then start gradle 'unpack' task:
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cp <original_boot_image> boot.img
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./gradlew unpack
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Your get the flattened kernel and /root filesystem under **./build/unzip\_boot**:
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build/unzip_boot/
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├── boot.img.avb.json (AVB only)
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├── bootimg.json (boot image info)
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├── kernel
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├── second (2nd bootloader, if exists)
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├── dtb (dtb, if exists)
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├── dtbo (dtbo, if exists)
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└── root
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Then you can edit the actual file contents, like rootfs or kernel.
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Now, pack the boot.img again
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./gradlew pack
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You get the repacked boot.img at $(CURDIR):
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boot.img.signed
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#### If you are working with recovery.img
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If you are working with recovery.img, the steps are similar:
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cp <original_recovery_image> recovery.img
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./gradlew unpack
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./gradlew pack
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And you get recovery.img.signed
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## 3. example & test
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An example boot.img has been placed at **src/test/resources/boot.img**, which is extracted from Nexus 5x(code: bullhead) factory images from [Google](https://dl.google.com/dl/android/aosp/bullhead-mda89e-factory-29247942.tgz), you can take it as a quick start.
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## 4. boot.img layout
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Read [layout](doc/layout.md) of Android boot.img.
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We now support both VB 1.0 and AVB 2.0 layouts.
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## 5. compatible devices
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| Device Model | Manufacturer | Compatible | Android Version | Note |
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|--------------------------------|--------------|----------------------|--------------------------|------|
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| Pixel 3 (blueline) | Google | Y | Q preview (qpp2.190228.023, <Br>2019)| [more ...](doc/additional_tricks.md#pixel-3-blueline) |
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| Pixel XL (marlin) | HTC | Y | 9.0.0 (PPR2.180905.006, <Br>Sep 2018)| [more ...](doc/additional_tricks.md#pixel-xl-marlin) |
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| Z18(NX606J) | ZTE | Y | 8.1.0 | [more...](doc/additional_tricks.md#nx606j) |
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| Nexus 9 (volantis/flounder) | HTC | Y(with some tricks) | 7.1.1 (N9F27M, Oct 2017) | [tricks](doc/additional_tricks.md#tricks-for-nexus-9volantis)|
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| Nexus 5x (bullhead) | LG | Y | 6.0.0_r12 (MDA89E) | |
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| Moto X (2013) T-Mobile | Motorola | N | | |
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## 6. References
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boot\_signer
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https://android.googlesource.com/platform/system/extras
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bouncycastle
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https://android.googlesource.com/platform/external/bouncycastle
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cpio / fs\_config
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https://android.googlesource.com/platform/system/core
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AVB
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https://android.googlesource.com/platform/external/avb/
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mkbootimg
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https://android.googlesource.com/platform/system/core/+/master/mkbootimg/
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Android version list
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https://source.android.com/source/build-numbers.html
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