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TMDXIDK5718: SD card boot issue

Part Number: TMDXIDK5718
Other Parts Discussed in Thread: AM5718

Hi,

We use to boot Linux form SD card slot in AM5718 idk evm. Off  late we are unable to boot from SD card slot. We have multiple EVM boards and the same sd card boots on other AM5718idks

One particular Idk  has this issue.

We have burned uboot to QSPI and Kernel to eMMC on same idk. In this case we can comfortably boot Linux. So I guess Board has as such no issue other than SD card.

If in insert SD card and try to boot even uboot does not show up. So i guess it still running ROMBoot loader.

I have tested continuity of SD card contact pins to R402,403,404,405,406,407 and  they are intact. On power up CMD, DAT1,DAT2,DAT3,DAT4 are pulled up to VSDMMC (3.3V). I have cross checked 10K pullup resistance too. Also tested the functionality of card detect (CD).  For bringing up uboot do we need this feature??

As i understand VSDMMC = 3.3V is default value fetched by PMIC and ROMBoot loader does not change it.

Is there any other dependency for SD card boot (uBOOT---> Linux)??

  • Hello,

    For the one board that does not boot from SD card, I am wondering if you could please share the boot pins. Also, after the board fails to boot, please connect to CCS (no gel files) and read the PC (program counter) from the "Registers" window.

    Regards,
    Krunal 

  • Hi,

    1. The boot option I have selected for SD card only production mode 

    Sysboot (5-4) = "11"

    sysboot (3-0) = " 0000"

    I selected this mode to hard code to SD card only mode, to avoid boot from  QSPI1 which has a valid uBOOT.

    The register read from SD card is as attached. I guess the boot process in Production mode is supposed to apply warm reset after 10 attempts

    but i am not sure about the time period in this loop , but I was able to connect JTAG and read the register contents.

    I will also try to boot from a new SD card ......

  • Hello,

    I am wondering if you have tried using the create-sd card script to re-flash/format the SD card.

    Regards,
    Krunal