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User.44
Visitor II
September 25, 2020
Question

I made a board with the official STM32MP157 and got the following error when measuring the CPU frequency

  • September 25, 2020
  • 1 reply
  • 643 views

The kernel I used was 4.19 and the CPU on STM32MP157AAA3 was able to read the CPU at 650M frequency.I failed to read when I only replaced THE CPU with STM32MP157DAA1.

STM32MP157AAA3 To read the CPU frequency results are as follows:0693W000004H6DxQAK.png

STM32MP157DAA1 Reads the CPU frequency as follows:

0693W000004H6OnQAK.png

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    1 reply

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    Bernard PUEL
    Technical Moderator
    September 25, 2020

    Hi,

    it seems your Device tree (DT) on second case is missing the "opp" node. Did you change the SW (DT) between the test ?

    Could you please share the kernel log of 157D case ?

    On ST boards, the opp is defined in "stm32mp157c.dtsi" file for 157A, C, D or F.

    It is better managed with some dedicated files in V2.0.0 (kernel 5.4).

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