The SDIO controller supports a maximum block length of 512 bytes. The SDIO capability register indicates a max length of 4,096 bytes. The software driver must use the 512 byte length and ignore what is read from the capabilities register.
Solution
Impact: Trivial. Typically there is no impact on customers since the host driver will use 512-byte blocks regardless of the value in this register. However, for stand-alone applications, this might cause confusion.
Work-around: None.
Configurations Affected: Systems that use the SDIO controller.
Device Revision(s) Affected: Refer to (Xilinx Answer 47916)- Zynq-7000 Design Advisory Master Answer Record There is no work-around at this time.