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Enhanced area feature is a new feature defined in eMMC4.4 standard. This user data area provides higher performance/reliability, at the expense of using twice the effective media space due to the area using SLC. The MMC driver now reads out the enhanced area offset and size and adds them to the device attributes in sysfs. Enabling the enhanced area can only be done once, and should be done in manufacturing. To use this feature, bit ERASE_GRP_DEF should also be set. Documentation/ABI/testing/sysfs-devices-mmc describes the two new attributes. Signed-off-by: Chuanxiao Dong <chuanxiao.dong@intel.com> Reviewed-by: Chris Ball <cjb@laptop.org> Signed-off-by: Chris Ball <cjb@laptop.org>
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What: /sys/devices/.../mmc_host/mmcX/mmcX:XXXX/enhanced_area_offset Date: January 2011 Contact: Chuanxiao Dong chuanxiao.dong@intel.com Description: Enhanced area is a new feature defined in eMMC4.4 standard. eMMC4.4 or later card can support such feature. This kind of area can help to improve the card performance. If the feature is enabled, this attribute will indicate the start address of enhanced data area. If not, this attribute will be -EINVAL. Unit Byte. Format decimal.
What: /sys/devices/.../mmc_host/mmcX/mmcX:XXXX/enhanced_area_size Date: January 2011 Contact: Chuanxiao Dong chuanxiao.dong@intel.com Description: Enhanced area is a new feature defined in eMMC4.4 standard. eMMC4.4 or later card can support such feature. This kind of area can help to improve the card performance. If the feature is enabled, this attribute will indicate the size of enhanced data area. If not, this attribute will be -EINVAL. Unit KByte. Format decimal.