How do I increase C6A816x ARM / DSP frequency?

Robert,

The current devices do not support 1.5GHz operation.  The current plan is to sample 1.5GHz devices in 1Q12.

Regards,
Marc

Hi Marc,

what is the maximum frequency for current devices?

- Robert

Robert,

1.2-GHz for the ARM, 1.0-GHz for the DSP

Regards,
Marc

Hi Marc,

Thank you. How can I test 1.2GHz for ARM?

- Robert

Hi Robert,

   Can you tell me how to check the frequency of ARM and DSP?

   I use cat /proc/cpuinfo for ARM, and I got 

 Processor       : ARMv7 Processor rev 2 (v7l)

BogoMIPS        : 986.31

   But I don't know if this means that ARM actually run at this frequency.

   Can you give me some suggestion for checking DSP frequency?

   Thank you.

Regards,

lei

Hi Lei,

I don't know how to check DSP frequency. I read datasheet, but there is not much details about how the frequency is calculated. That's why I asked this question.

- Robert

Thank you Robert. 

I found the API getCPULoad can get the load of DSP, but I didn't find any API to get the frequency of DSP.

Regards,

Lei

Hi  Robert,

  In sprugx9.pdf, there is some description about clocks, and it gives some method to calculate and configure the clocks.

  According to this document, I think the default freq of DSP maybe is  813.176MHz, and ARM is 987.428MHz.

  Please check it.

Regards,

lei

Hi Lei,

pls what page?

Only what I found in this document is MAINPLL_FREQX register description (page 285 1.15.1.2.5 Main PLL Frequency 2 Register (MAINPLL_FREQ2)), but not the method of calculation.

Thank you,

- Robert

Hi Robert,

   Page 194 mentioned the Flying Adder PLL which is used in Main PLL,

   page 195  shows the structure of Main PLL,(SYSCLK1 to DSP, SYSCLK2 to Cortex-A8)

   and there is an example about the parameters for clock calculation in page 197 table 1-73.

   Maybe we can increase the frequency by modifying those registers,

   but I am not quite clear how to change the registers value.

Regards,

Lei

Maybe we can increase the frequency by modifying those registers, 

- I believe so

but I am not quite clear how to change the registers value.

- I agree, it would be great to have examples for 1.2GHz / 1.5GHz, ARM & DSP

I am surprise there is no option in uBoot source code to set the frequency.