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 Post subject: Changing the core frequency
PostPosted: Wed May 10, 2017 12:12 pm 
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Joined: Sat Nov 21, 2015 9:41 pm
Posts: 7
Hello

I'm using the AT91SAMA5D21 controller. I would like to change the core cpu clock to a lower frequency value. I think the CPU is usually running with 498 MHz.
Which software part is responsible for setting the clock frequency?
Is it u-boot or is it the Linux kernel?

Maybe someone can point me into the right direction.

Thanks,
Andreas


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 Post subject: Re: Changing the core frequency
PostPosted: Thu May 11, 2017 12:37 am 
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Joined: Thu Apr 19, 2007 10:15 pm
Posts: 1447
Location: USA
andi0109 wrote:
Which software part is responsible for setting the clock frequency?
If you want to change the MPU clock, then it has to be done in AT91Bootstrap, and also propagate that change to U-Boot and the Linux kernel.
Look for a MASTER_CLOCK (or similar) definition in each program and the kernel.

Regards


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