[Bug 1569] New: Add CRC checks to SD card driver

[bugzilla-daemon at rtems.org]

https://www.rtems.org/bugzilla/show_bug.cgi?id=1569

           Summary: Add CRC checks to SD card driver
           Product: RTEMS
           Version: HEAD
          Platform: All
        OS/Version: RTEMS
            Status: NEW
          Severity: enhancement
          Priority: P3
         Component: misc
        AssignedTo: joel.sherrill at oarcorp.com
        ReportedBy: arnout at mind.be


Created an attachment (id=799)
 --> (http://www.rtems.org/bugzilla/attachment.cgi?id=799)
Add CRC checks to SD card driver

SD cards have CRC checks for commands and for data.  These are currently set to
0 by the driver to disable CRC checking.  Since I have unreliable SPI hardware,
I do need the CRC checks.  The following patch adds them.

The code for the CRC computation is taken from
http://en.wikipedia.org/wiki/Computation_of_CRC

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