Andorid use vold to manage SD card and it is easy to use. But I meet many troubles and finally find that the real problem is in the Linux Kernel. Thanks to the Android Mail List.
Part I (kernel)
(1)make sure thus kernel configuration in MMC driver
CONFIG_MMC=y # CONFIG_MMC_DEBUG is not set CONFIG_MMC_UNSAFE_RESUME=y # CONFIG_MMC_EMBEDDED_SDIO is not set CONFIG_MMC_PARANOID_SD_INIT=y
# # MMC/SD Card Drivers # CONFIG_MMC_BLOCK=y CONFIG_MMC_BLOCK_BOUNCE=y # CONFIG_MMC_BLOCK_PARANOID_RESUME is not set # CONFIG_SDIO_UART is not set # CONFIG_MMC_TEST is not set
# # MMC/SD Host Controller Drivers # CONFIG_MMC_SDHCI=y (2)Disable this option General Setup -> Create deprecated sysfs layout for older userspace tools
Before I did this,vold showed a lot of trouble. And ,my media_path is not right media_path /devices/platform/s3c-sdhci.0/mmc_host:mmc0<--my path before turn off that option
media_path /devices/platform/s3c-sdhci.0/mmc_host/mmc0 <--this is the right one
Vold may be unhappy to accept my old path,and it didn't work.
D/vold ( 42): Accepted connection from framework D/vold ( 42): dispatch_cmd(send_ums_status): D/vold ( 42): dispatch_cmd(mount_volume:/sdcard): E/vold ( 42): Cannot start volume '/sdcard' (volume is not bound) D/MountListener( 59): handleEvent volume_nomedia:/sdcard D/MountListener( 59): handleEvent ums_disabled D/MountListener( 59): handleEvent ums_disconnected
(3) rebuild your linux kernel
PART II(android system)
(1) creat a vold.conf in build/target/board/idea6410
## vold configuration file for idea6410
volume_sdcard { ## This is the direct uevent device path to the SD slot on the device media_path /devices/platform/s3c-sdhci.0/mmc_host/mmc0
media_type mmc mount_point /sdcard ums_path /devices/platform/usb_mass_storage/lun0 }
(2)add those below to AndroidBoard.mk
include $(CLEAR_VARS) LOCAL_MODULE_CLASS := ETC LOCAL_MODULE := vold.conf LOCAL_SRC_FILES := $(LOCAL_MODULE) include $(BUILD_PREBUILT)
(3)rebuild the system and check init.rc
service vold /system/bin/vold socket vold stream 0660 root mount
(4)enjoy
D/vold ( 42): Accepted connection from framework D/vold ( 42): dispatch_cmd(send_ums_status): D/vold ( 42): dispatch_cmd(mount_volume:/sdcard): I/vold ( 42): Evaluating dev '/devices/platform/s3c-sdhci.0/mmc_host/mmc0/mmc0:e624/block/mmcblk0' for mountable filesystems for '/sdcard' D/MountListener( 61): handleEvent volume_unmounted:/sdcard D/MountListener( 61): handleEvent ums_disabled D/MountListener( 61): handleEvent ums_disconnected D/MountListener( 61): handleEvent volume_checking:/sdcard
Rockie Cheng
阿虚
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