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AM625: Is possible to control GPIOs assigned to MCU domain in BootROM?

Weicheng Li
Intellectual 375 points
Part Number: AM625

Hi TI expert

Is possible to control GPIOs which are assigned to MCU domain in BootROM? we need to pull high these GPIOs as soon as possible when the SoC is power on. and according to the boot flow, the earliest way to complete this operation may be done in bootROM.

Thanks!

BR

Weicheng

  • 0
    TI__Guru* 86820 points

    Weicheng, the boot ROM code is not modifiable.  So the earliest you could change GPIOs is in SPL or SBL bootloaders.  

    Regards,

    James

  • 0 in reply to JJD
    Intellectual 375 points

    Hi James

    As we now use the eMMC as the image storage, initialization for the eMMC takes long time, we only have 100ms budge to pull high these GPIOs. no chance to handler this in the SBL.

    1.20ms for the PMIC

    2.9ms for reset release

    3.typical 50ms for the initialization for the eMMC with PON( if this time takes longer, then the 100ms budge will be used up)

    4.6ms to load SBL.

    5.SBL can complete this GPIO operation

    But thanks for your sharing,  Boot ROM is not modifiable.

    BR

    Weicheng