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Freescale esdhc-specific options
Support Freescale adapter card type identification. This is implemented by
operating Qixis FPGA relevant registers. The STAT_PRES1 register has SDHC
Card ID[0:2] bits showing the type of card installed in the SDHC Adapter Slot.
SDHC Card ID[0:2] Adapter Card Type
0b001 eMMC Card Rev4.5
0b010 SD/MMC Legacy Card
0b011 eMMC Card Rev4.4
0b101 MMC Card
0b110 SD Card Rev2.0/3.0
0b111 No card is present
ESDHC IP is in little-endian mode. Accessing ESDHC registers can be
determined by ESDHC IP's endian mode or processor's endian mode.
ESDHC IP is in big-endian mode. Accessing ESDHC registers can be determined
by ESDHC IP's endian mode or processor's endian mode.
- CONFIG_SYS_FSL_ESDHC_FORCE_VSELECT forces to run at 1.8V.