Android System分区大小异常

 

平台:Freescale / Android 4.2.2

问题描述:

用 df 命令,看到/system分区大小275M。

用 busybox fdisk -l /dev/block/mmcblk0p5,看到 536M。

 

Freescale的刷机工具是Mfgtool,分区的动作在mksdcard-android.sh里面完成。

SYSTEM_ROM_SIZE=512

dd if=/dev/zero of=${node} bs=1024 count=1

sfdisk --force -uM ${node} << EOF
,${boot_rom_sizeb},83
,${RECOVERY_ROM_SIZE},83
,${extend_size},5
,${data_size},83
,${SYSTEM_ROM_SIZE},83
,${CACHE_SIZE},83
,${VENDER_SIZE},83
,${MISC_SIZE},83
EOF

注: dd 命令

格式:起始,大小,ID

起始 = 起始柱面(如果不进行指定则为第一可用柱面),大小 = 柱面数量(如果不进行指定则指所有柱面),ID号 = 分区类型(L: Linux, S: Swap, E:扩展分区)

 

Mfgtool的配置文件是ucl2.xml

其中,刷System.img的命令是:

<CMD state="Updater" type="push" body="pipe dd of=/dev/mmcblk0p5 bs=512" file="files/android/system.img">Sending and writting system.img</CMD>

可以看到,这边使用了 dd 命令,blocksize是512byte,将system.img拷贝到了/dev/mmcblk0p5分区。

但是,dd 命令的会改变分区的大小,改变后的分区大小就是system.img文件的实际大小。

所以,使用 df 命令会看到 275M。

 

解决方式:

修改 device/fsl/imx6/BoardConfigCommon.mk :

BOARD_SYSTEMIMAGE_PARTITION_SIZE := 524288000

BOARD_SYSTEMIMAGE_PARTITION_SIZE 会在 build/core/Makefile 中使用到:

define build-systemimage-target
  @echo "Target system fs image: $(1)"
  @mkdir -p $(dir $(1)) $(systemimage_intermediates) && rm -rf $(systemimage_intermediates)/system_image_info.txt
  $(call generate-userimage-prop-dictionary, $(systemimage_intermediates)/system_image_info.txt)
  $(hide) PATH=$(foreach p,$(INTERNAL_USERIMAGES_BINARY_PATHS),$(p):)$$PATH       ./build/tools/releasetools/build_image.py       $(TARGET_OUT) $(systemimage_intermediates)/system_image_info.txt $(1)
endef

generate-userimage-prop-dictionary 方法会对 system_image_info.txt 赋值:

define generate-userimage-prop-dictionary
$(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 $(BOARD_USERDATAIMAGE_PARTITION_SIZE),$(hide) echo "userdata_size=$(BOARD_USERDATAIMAGE_PARTITION_SIZE)" >> $(1))
$(if $(BOARD_CACHEIMAGE_FILE_SYSTEM_TYPE),$(hide) echo "cache_fs_type=$(BOARD_CACHEIMAGE_FILE_SYSTEM_TYPE)" >> $(1))
$(if $(BOARD_CACHEIMAGE_PARTITION_SIZE),$(hide) echo "cache_size=$(BOARD_CACHEIMAGE_PARTITION_SIZE)" >> $(1))
$(if $(INTERNAL_USERIMAGES_SPARSE_EXT_FLAG),$(hide) echo "extfs_sparse_flag=$(INTERNAL_USERIMAGES_SPARSE_EXT_FLAG)" >> $(1))
$(if $(mkyaffs2_extra_flags),$(hide) echo "mkyaffs2_extra_flags=$(mkyaffs2_extra_flags)" >> $(1))
$(if $(TARGET_MKUBIFS_ARGS),$(hide) echo "mkfsubifs_flags=$(TARGET_MKUBIFS_ARGS)" >> $(1))
$(if $(filter true, $(strip $(HAVE_SELINUX))), echo "selinux_fc=$(TARGET_ROOT_OUT)/file_contexts" >> $(1))
endef

关键词汇是:system_size

随后调用了./build/tools/releasetools/build_image.py,传入的参数就是system_image_info.txt:

  if mount_point == "system":
    copy_prop("fs_type", "fs_type")
    copy_prop("system_size", "partition_size")
 
...... ......

 if fs_type.startswith("ext"):
    build_command = ["mkuserimg.sh"]
    if "extfs_sparse_flag" in prop_dict:
      build_command.append(prop_dict["extfs_sparse_flag"])
      run_fsck = True
    build_command.extend([in_dir, out_file, fs_type,
                          prop_dict["mount_point"]])
    if "partition_size" in prop_dict:
      build_command.append(prop_dict["partition_size"])
    if "selinux_fc" in prop_dict:
      build_command.append(prop_dict["selinux_fc"])
exit_code = RunCommand(build_command)

转来转去又调用了 mkuserimg.sh,记住 partition_size 是作为第五个参数传进去的:

OUTPUT_FILE=$2
EXT_VARIANT=$3
MOUNT_POINT=$4
SIZE=$5
FC=$6

MAKE_EXT4FS_CMD="make_ext4fs $ENABLE_SPARSE_IMAGE $FCOPT -l $SIZE -a $MOUNT_POINT $OUTPUT_FILE $SRC_DIR"

终于看到核心了,使用了make_ext4fs来制作img了。

Android System分区大小异常,布布扣,bubuko.com

Android System分区大小异常

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