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SD Card example design using standalone?

Former Member

Hello folks,

Quick question:  Is it possible to do read/writes to an SD card using standalone (bare-metal) OS? 

I tried building a Zynq-based SDK project with a standalone BSP + xilfatfs.  However when I do so I get this error in SDK:

ERROR:EDK:3900 - issued from TCL procedure "::sw_xilfatfs_v1_00_a::xilfatfs_drc"
   line 15
   xilfatfs () - Sysace HW module not present or not accessible from this
   processor. FATfs cannot be used without this module

So my guess is, standalone OS doesn't have libraries for SD/MMC support...

I know the typical flow is to use U-boot/Linux, but my application will be *dumb* simple and U-boot/Linux would be unnecessary overhead. 

The application will simply move a file from SD card over to memory, and buffer the data via GPIOs to an external device.

Thanks,

Eddie

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    Hi Eddie,

    Tim makes a great suggestion above.

    I just wanted to add that using only U-Boot may also be an option to look at as well.  There are mechanisms built into U-Boot for reading FAT file systems.

    Another option to look at, if your code is compact enough, is the FSBL.  There are mechanisms in FSBL BSP for reading from the SD card FAT file system.  Plus you have the source code available to you for modification.

    Going to either of these routes will give you some nice APIs to work with but still keep you at a very low level of complexity when it comes to writing into the PL hardware address space.

    Regards,

    -Kevin

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    Hi Eddie,

    Tim makes a great suggestion above.

    I just wanted to add that using only U-Boot may also be an option to look at as well.  There are mechanisms built into U-Boot for reading FAT file systems.

    Another option to look at, if your code is compact enough, is the FSBL.  There are mechanisms in FSBL BSP for reading from the SD card FAT file system.  Plus you have the source code available to you for modification.

    Going to either of these routes will give you some nice APIs to work with but still keep you at a very low level of complexity when it comes to writing into the PL hardware address space.

    Regards,

    -Kevin

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