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SD card not responding on Linux. OMAP 137L

Jean-Marc
Prodigy 190 points
Other Parts Discussed in Thread: OMAP-L137

Has anyone had issues where certain SD cards don't seem to work.

When I plug in my  512MB SD Class ? card I get the following, and can mount the drive.

mmcblk0: p1

mmcblk0: mmc0:e624 SD512 495488KiB

If I try it with my 4GB SDHC Class 4, nothing gets recognized.  I know there is some differences between SD and SDHC.  The chip datasheet says it supports the V2.0 spec which my card most likely uses.  Can anyone reproduce this? 

~JM

 

  • 0
    TI__Mastermind 25916 points

    JM,

    I've been able to use SD Card with /dev/mmcblk0p1 .  Even booting uImage with SD card as target filesystem.

    I don't think SDHC is yet supported.

    Are you enabling SDMMC as prescribed on p. 34 of LSP_02.20_OMAP-L137_User_Guide?

    I'm using LSP_02_20_00_05 but had this working with LSP_02_20_00_03 also.

    -Joe

  • 0 in reply to Joe G.
    Prodigy 190 points

    That's too bad (I did get a couple more cards to try out, and the 2GB SD works fine, but 2 different SDHC ones do not.  That is too bad since the SDHC are available in significantly higher speeds/ sizes.  

     

    Were you able to boot uImage from the SD card? Or are you still using TFTP to load uImage?  It looks like it requires some code modifications to the u-boot program (mmcinit isn't supported).  It looks like that work has been done on other OMAPS but hasn't made it's way into this one yet.  

     

    ~JM

  • 0 in reply to Jean-Marc
    TI__Mastermind 25916 points

    uImage on SD not yet.
    But uImage on USB stick (i.e. micro USB port with adaptor) was quick with latest uBoot for standalone..
    I think SDHC is in the Linux roadmap.     SDHC will work on DSP side if you use RTFS package in DSP/BIOS from SDK website (in BIOSPSP, I think).

  • 0 in reply to Joe G.
    TI__Expert 7435 points

    You can have the filesystem on USB stick too.

    regards

    swami

  • 0 in reply to swami
    Prodigy 190 points

    sweet I'l try that.. thanks!

    ~JM