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Changing from 500MHz to 600MHz in Linux kernel

Mugen
Intellectual 280 points

Hello.

How to change cpu frequency in linux kernel from 500MHz to 600MHz without using cmdline mpurate=600M?

What file in kernel source I have to change ?

With cmdline mpurate=600M kernel tells that  it switch into new frequency 600Mhz but BogoMips remains 499,92 and there is no effect of using this cmdline.

I checked cpu speed and it's the same with or without cmdline mpurate=600M.

Please any advices.

Thank you.

  • 0
    Expert 1205 points

    Hi Mugen,

               I reckon there is no single file you can be using for setting the frequency, however you can use the attached u-boot binary(bootloader) where you can set the frequency accordingly and later booting up the kernel will lead to change in the frequency in the kernel.

    Steps to be followed

    1.  Load the u-boot(poe_u-boot.bin)

    2.  Stop at the bootloader prompt.

    3.  Type "poe" which will lead to a menu where you can set the frequency accordingly.

    4.  Now without restarting, boot the kernel and you can see a switch in frequency accordingly.

    Hope this helps.

    0268.poe_u-boot.zip

     

     

    Regards,

    N.S.SriHarsha

    P.S : poe_u-boot.bin(menu based programming) may sometimes hung.

  • 0 in reply to SriHarsha N.S
    Intellectual 280 points

    Hello.

    Can you provide a source code  of poe_u-boot ?

    Thank you.

  • 0 in reply to Mugen
    Expert 1205 points

    Hi Mugen,

               Can you please let me know whether this worked?

     

    Regards,

    N.S.SriHarsha

  • 0 in reply to SriHarsha N.S
    Intellectual 280 points

    Heillo.

    I could not boot u-boot.

    I have a MICRON 8bit 256MB NAND flash (2cda) and DDR2 memory with the following params:
    2 chips with the 13 rows,  4 banks, 10 column each chip.
    All chips using only CS0.

    So I cannot boot u-boot with the params for the am3517evm or ?

    Can you send me binary file with the above  params ?

    Thank you.

  • 0 in reply to SriHarsha N.S
    Intellectual 290 points

    Hi,

      I tried your u-boot but x-loader failed to load it. I used the AM3517EVM and tried it with x-loader built from the 04.02.00.07 and 03.00.01.06 PSPs. In both cases it died right after "Starting OS Bootloader.."

     

    Can you tell me more about how you created your example? What version of x-loader were you using to launch it? On which board? 

     

    Thanks,
    Jemiah

    .