0 Replies Latest reply on Nov 19, 2013 1:32 AM by koteswararao.nelakurthi

    hdd led is off on intel ATCA-46xx board (Front panel)

    koteswararao.nelakurthi

      Hi,

       

      I am koteswararao working on intel based x86_64 board (ATCA-46xx) which has

      HDD LED that indicates the status about HDD access . During HDD access

      LED is 'ON'. But, after applying sgpio related patches specified in below link ,

      the HDD LED is continuously 'OFF' and doesn't blink during HDD read/write operations.

       

      The below commit's are backported from 3.2 kernel (kernel.org)

      {{{

      1.

      8ec6552f4a77d15f446b00aed364e3c12d38aa6c

      [SCSI] libsas: sgpio write support

       

      2.

      13257cfbc57e9cf84fd9fe0cb7a909b3fb4f7482

      [SCSI] isci: fix sgpio register definitions

       

      3.

      ad4f4c1de80abdda5d55315289505598aa78e355

      [SCSI] isci: initial sgpio write support

      }}}

       

      I have gone through the above commit code and observed that

      SGPIO_HW_CONTROL macro defined in 3rd commit in above list

      is causing the issue.  I referred C600 data sheet given in below link

       

      http://www.intel.com/content/dam/www/public/us/en/documents/datasheets/c600-series-chipset-datasheet.pdf

       

      to get idea over SGPIO_HW_CONTROL macro bit settings and observed

      that LED issue is due to FSENG activity written in to SCU output data select register.

      There is no much details about FSENG activity.

      Could anyone please let me know more details about FSENG activity?

      What does this FSENG activity means?

      how it has effect on HDD LED (front panel LED)?

       

      Thanks for allowing me in posting this mail.

       

      Regards

      koti46xx