Android rom定制 修改system分区的容量大小

1、写在前面

系统ROM定制化，预置app太多，会导致系统rom很大，原生系统system分区已经不够用了，要加大系统systemui分区

2.修改system分区的容量大小的核心类

device/mediatekprojects/$project/BoardConfig.mk
build/make/core/Makefile

3、修改system 分区的容量大小的核心功能分析

Android 通常有以下分区：

System分区: 就是我们刷ROM的分区

Data分区: 分区就是我们装APK的分区

Catch分区：是缓存分区

SDCard分区：就是挂载的sd卡

3.1 Makefile中关于system分区的定义：

# $(1): the path of the output dictionary file
 # $(2): additional "key=value" pairs to append to the dictionary file.
 define generate-userimage-prop-dictionary
 $(hide) echo "ext_mkuserimg=$(notdir $(MKEXTUSERIMG))" >> $(1)
 $(if $(INTERNAL_USERIMAGES_EXT_VARIANT),$(hide) echo "fs_type=$(INTERNAL_USERIMAGES_EXT_VARIANT)" >> $(1))
 $(if $(BOARD_SYSTEMIMAGE_PARTITION_SIZE),$(hide) echo "system_size=$(BOARD_SYSTEMIMAGE_PARTITION_SIZE)" >> $(1))
 $(if $(BOARD_SYSTEMIMAGE_FILE_SYSTEM_TYPE),$(hide) echo "system_fs_type=$(BOARD_SYSTEMIMAGE_FILE_SYSTEM_TYPE)" >> $(1))
 $(if $(BOARD_SYSTEMIMAGE_EXTFS_INODE_COUNT),$(hide) echo "system_extfs_inode_count=$(BOARD_SYSTEMIMAGE_EXTFS_INODE_COUNT)" >> $(1))
 $(if $(BOARD_SYSTEMIMAGE_EXTFS_RSV_PCT),$(hide) echo "system_extfs_rsv_pct=$(BOARD_SYSTEMIMAGE_EXTFS_RSV_PCT)" >> $(1))
 $(if $(BOARD_SYSTEMIMAGE_JOURNAL_SIZE),$(hide