Android Q动态分区相关初步整理

最新推荐文章于 2025-07-29 09:13:10 发布

原创

最新推荐文章于 2025-07-29 09:13:10 发布 · 1.1w 阅读

20 ·

CC 4.0 BY-SA版权

本文深入探讨了Android10中引入的动态分区机制，详细分析了super.img的生成过程，包括编译阶段的参数设置与差分包的生成逻辑。通过对super.img的解包，揭示了动态分区在设备上的具体布局。

Android 10上刷机使用了super.img,差分包多了dynamic_partitions_op_list，大致查询了下是新增了动态分区，从编译到生成差分包都做了一些修改，本次先整理大致分析，对这个更新点有初步的认识

一、编译方面

1.super.img的生成

通过编译的log可以看到，super.img的生成

make

build/make/core/Makefile

# If BOARD_BUILD_SUPER_IMAGE_BY_DEFAULT is set, super.img is built from images in the
# $(PRODUCT_OUT) directory, and is built to $(PRODUCT_OUT)/super.img. Also, it will
# be built for non-dist builds. This is useful for devices that uses super.img directly, e.g.
# virtual devices.
ifeq (true,$(BOARD_BUILD_SUPER_IMAGE_BY_DEFAULT))
$(INSTALLED_SUPERIMAGE_TARGET): $(INSTALLED_SUPERIMAGE_DEPENDENCIES)
    $(call pretty,"Target super fs image for debug: $@")
    $(call build-superimage-target,$(INSTALLED_SUPERIMAGE_TARGET),\
      $(call intermediates-dir-for,PACKAGING,superimage_debug)/misc_info.txt)

编译log

[100% 1686/1686] Target super fs image for debug: out/target/product/k61v1_64_bsp/super.img
2020-01-06 16:14:22 - build_super_image.py - INFO    : Building super image from info dict...
2020-01-06 16:14:22 - sparse_img.py - INFO    : Total of 370303 4096-byte output blocks in 21 input chunks.
2020-01-06 16:14:22 - sparse_img.py - INFO    : Total of 383438 4096-byte output blocks in 19 input chunks.
2020-01-06 16:14:22 - sparse_img.py - INFO    : Total of 83534 4096-byte output blocks in 11 input chunks.
2020-01-06 16:14:22 - common.py - INFO    :   Running: "lpmake --metadata-size 65536 --super-name super --metadata-slots 2 --device super:4294967296 --group main:4292870144 --partition product:readonly:1516761088:main --image product=out/target/product/k61v1_64_bsp/product.img --partition system:readonly:1570562048:main --image system=out/target/product/k61v1_64_bsp/system.img --partition vendor:readonly:342155264:main --image vendor=out/target/product/k61v1_64_bsp/vendor.img --sparse --output out/target/product/k61v1_64_bsp/super.img"
2020-01-06 16:15:34 - common.py - INFO    : lpmake I 01-06 16:14:22   697   697 builder.cpp:937] [liblp]Partition product will resize from 0 bytes to 1

最低0.47元/天解锁文章