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SDHC errata

Question asked by Makoto Katsukura on Dec 24, 2013
Latest reply on Jan 7, 2014 by Timesys Support

Dear forum members,


    My team is making a product using Vybrid VF5 and Linux 3.0 ( provided
by Timesys ). We use a multi media card (SD-CARD) to store our customers’ data.
However, we found that there are some errata around SDHC function of Vybrid.

Errata around SDHC are as follows:


  1. e3980 “SDHC: Glitch is generated on card clock with software reset
    or clock divider change”
  2. e3981 “SDHC: ADMA fails when data length in the last descriptor is
    less or equal to 4 bytes”
  3. e3982 “SDHC: ADMA transfer error when the block size is not a
    multiple of four”
  4. e3983 “SDHC: Problem when ADMA2 last descriptor is LINK or NOP”
  5. e4627 “SDHC: Erroneous CMD CRC error and CMD Index error may occur
    on sending new CMD during data transfer”


I just want to know that Linux SDHC drivers in Timesys Linux are already modified to avoid those errata or not.
If not, we need to plan to modify the code to avoid those errata.


Best regards,

Makoto Katsukura



  Vybrid Errata ( Vybrid 1N02G )