android sd card porting

 

I (android kernel)
1.make sure this 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  --->   
[ ] enable deprecated sysfs features to support old userspace tools  
if choice it will open can't mount SD card error
3.filesystem support
 File systems  --->
 DOS/FAT/NT Filesystems  --->
 <*> VFAT (Windows-95) fs support      
-*- Native language support  ---> 
 <*>  Codepage 437 (United States, Canada)
 <*>   Simplified Chinese charset (CP936, GB2312)    
 <*>   NLS ISO 8859-1  (Latin 1; Western European Languages)   
II (android system)
reference http://hi.baidu.com/jugege/blog/item/f58b2fdc13d770b5cc1166c7.html
1.start vold service
in init.rc start the vold service
service vold /system/bin/vold
        socket vold stream 0660 root mount
        ioprio be 2
2.configuration vold.fstab
/system/etc/vold.fstab
dev_mount sdcard /mnt/sdcard auto /devices/platform/s3c-sdhci.0/mmc_host/mmc0