• State Resolved
  • Locked Locked
  • Replies 2 replies
  • Answers 1 answer
  • Subscribers 98 subscribers
  • Views 326 views
  • Users 0 members are here
Support feedback
Options
Options
Related

This thread has been locked.

If you have a related question, please click the "Ask a related question" button in the top right corner. The newly created question will be automatically linked to this question.

Original question:

TDA2HG: 【Linux 】Linux kernel hung on " Waiting for root device PARTUUID=bbb167d9-02..."

TDA2HG: How can TDA2HG configure O917A133 on DVFS mode

Tim-ckt1010
Expert 1685 points
Part Number: TDA2HG
Other Parts Discussed in Thread: TDA2

Hi,

My board use TDA2HG as processor, O917A133 as PMIC. And external MCU set POWERON and POWERHold to let O917A133 output power to TDA2HG.

Please refer diagram below:

TDA2HG output signal to O917A133 's nRESWARM, and O917A133 output Rest_out signal to TDA2HG's RESETn.

The problem: is everytime when TDA2HG configure O917A133 in "warm reset sequences", TDA2HG will reset by O917A133. But actually TDA2HG only want O917A133 change it's output voltage not reset TDA2HG. Or it may called DVFS mode.

But from O917A133 datasheet, it only have OFF2ACT, ACT2OFF, ACT2SLP and Warm Reset Sequences. So is DVFS mode available on this design?

Thanks a lot!

  • 0
    TI__Guru 54382 points

    Tim,

    DVFS is a software concept where application code would change the Voltage and Frequency to a new OPP to increase performance (and increase power) or decrease power (and decrease performance) at run-time.

    However, DVFS is not supported in the SDK for the TDA2 devices.

    Regards,

    Kyle

  • 0 in reply to kcastille
    Expert 1685 points

    Thanks Kyle!

    I finger out this problem already. Actaully SOC rest_out singal is because I configure SMPS4 on a wronge voltage then cause SOC rest.

    And I think if I leave SMPS4 along which is only for DDR supply, is OK for my system to work property.

    Anyway, thanks for your reply!