4 Replies Latest reply on Nov 16, 2016 9:58 AM by jafoste4

    PicoZed fails to load OS from eMMC at low temp


      I am using the  AES-Z7PZ-7Z015-SOM-G Rev C04. When the board is cold started (power up after being powered off for a while) it will boot into Pentalinux but will not load the OS from the eMMC. After a couple of power cycles it will eventually boot al the way up.  

      I put the SOM and Carrier in a temperature chamber and I could repeat the failure when the set point was less than 20C.

      Below is a log of what I am seeing when it fails:


      U-Boot 2015.07 (Sep 01 2016 - 14:31:20 -0500)

      DRAM:  ECC disabled 1 GiB
      MMC:   zynq_sdhci: 0
      SF: Detected S25FL128S_64K with page size 256 Bytes, erase size 64 KiB, total 16 MiB
      In:    serial
      Out:   serial
      Err:   serial
      Net:   Gem.e000b000
      Hit any key to stop autoboot:  4  3  2  1  0 
      sdhci_transfer_data: Error detected in status(0x208000)!
      Device: zynq_sdhci
      Manufacturer ID: fe
      OEM: 14e
      Name: MMC04
      Tran Speed: 52000000
      Rd Block Len: 512
      MMC version 4.4.1
      High Capacity: Yes
      Capacity: 3.5 GiB
      Bus Width: 4-bit
      Erase Group Size: 512 KiB
      HC WP Group Size: 4 MiB
      User Capacity: 3.5 GiB
      Boot Capacity: 16 MiB ENH
      RPMB Capacity: 128 KiB ENH
      ** Unrecognized filesystem type **