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CCS/AM3352: SD boot issue

richard chiang
Prodigy 160 points
Part Number: AM3352

Tool/software: Code Composer Studio

AM3352 boot from SD with CCC message .We do'nt wire MMC0_SDWP pin to SD card ,Is any effect to SD boot?

When we boot fail , we re-power off than power-on the system ,Our system show CCC again.

we need re-move SD card and re-insert SD card , the system will keep go on boot and success

Could you let me know what function in this WP pin? 

  • 0
    TI__Guru 69657 points

    Won't be able to look into this until later this week or early next week. Thanks for your patience.

  • 0
    TI__Guru 69657 points

    Hi Richard,

    richard chiang said:
    AM3352 boot from SD with CCC message .We do'nt wire MMC0_SDWP pin to SD card ,Is any effect to SD boot?

    This signal should not affect the ability of ROM loading the first stage of U-Boot (SPL a.k.a. "MLO"). Similarly, the ROM code also ignores the card detection signal (as per TRM: "The ROM Code does not handle the card detection feature on card cage.").

    Those CCCC... prints in your console come from the UART boot mode that somehow gets invoked. Is this intentional? What are your SYSBOOT pin settings?

    Also can you probe the SD_CLK and SD_CMD signals with a logic analyzer during your failed boot attempts? Do you see any activity there?

    Regards, Andreas