Linux/TDA2SX: Memory frequency how to adjust dynamically.

zhong

Part Number: TDA2SX
Other Parts Discussed in Thread: TDA2

Tool/software: Linux

hi ti

The DDR memory model I used was w632gu6mb-12.I want to know how to set it to dynamically adjust the frequency according to the load.

Can I use devfreq?What if I could change the device tree?I hope I get the answer.

thaks.

over 6 years ago

0 Shravan Karthik over 6 years ago

TI__Genius 14650 points

Hi,

It isn't recommended to update the DDR frequency dynamically. It is set as part of the bootloader and must not be modified.
By default in the Linux kernel, Dynamic Voltage Frequency Scaling is enabled which modifies the frequency of the A15 depending on the system load.

Regards
Shravan

0 zhong over 6 years ago in reply to Shravan Karthik

Prodigy 240 points

hi Shravan
If it has to be modified, is it possible to implement it in the kernel?

What are the effects of the changes?

0 zhong over 6 years ago in reply to Shravan Karthik

Prodigy 240 points

thanks

0 Shravan Karthik over 6 years ago in reply to zhong

TI__Genius 14650 points

Hi,

Linux runs out of DDR, so you can't modify the DDR frequency on the fly. The DDR configuration happens from U-boot (SPL), which runs from the on-chip memory. After this no configuration of DDR happens.

Regards
Shravan

0 zhong over 6 years ago in reply to Shravan Karthik

Prodigy 240 points

hi Shravan

Is there a memory low power mode?

thanks

0 Shravan Karthik over 6 years ago in reply to zhong

TI__Genius 14650 points

Hi,

TDA2 family of SoCs don't support low power memory mode.

Regards
Shravan

0 zhong over 6 years ago in reply to Shravan Karthik

Prodigy 240 points

thanks

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Linux/TDA2SX: Memory frequency how to adjust dynamically.