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AM6548: DVFS support schedule

Ryuuichi machida
Guru 13220 points

Part Number: AM6548

Hi,

According to datasheet of AM6548, there is following description.
(Please see Note of Section 5.5.1)

This device, when used in a production system, only supports one static OPP over the lifetime of the device.


I understood that this means AM6548 do NOT support DVFS on SR1.0.
If my understanding is correct, I would like you to ask about below.

* Do you have plan to support DVFS for the future on AM654X ?

Best Regards,

  • 0
    TI__Guru 56477 points

    Machida-san,  (Long time no talk, hope things are going well for you!)

    That is correct, AM6548 does not support DVFS.  It may be possible to reduce power (at a single OPP Voltage aligned to the highest desired frequency) by using frequency aka DFS.

    Regards,

    Kyle

  • 0 in reply to kcastille
    Guru 13220 points

    Hello Kyle-san, (I'm glad to talk you again !)

    Thank you for your reply.

    Let me confirm about following two.

    1. "AM6548 does not support DVFS."

    Does above mean you have no plan to support DVFS for AM654x at this time ?

    2. If you can not answer about below, please forward to proper person.

    "It may be possible to reduce power (at a single OPP Voltage aligned to the highest desired frequency) by using frequency aka DFS."

    For above :

    Now, I am also checking Linux SDK. I understand that Current SDK (6.02.00.81) did not implement CPUfreq. This means that user can not change CPU frequency from Linux OS level.

    According to following URL, TI use 800MHz for CPU clock, however I'm not sure how user can realize DFS at current environment.

    (Now I understood that user only use fixed frequency..)

    Do you have solution for my above question ?

    Best Regards,

  • 0 in reply to Ryuuichi machida
    TI__Guru 56477 points

    1. The device fundamentally can't support DVFS.

    2. I don't have a solution for this.

    Regards,

    Kyle