How configure Linux for the ADSP SC587 at 500MHz

Question

Hi,

We using a ADSP SC587, 500MHz version with DD3 memory.

The ADSP SC587 works at 500MHz clock frequency , but the DDR3 memory controller only at 450MHz

What we should configure in Linux to let run the cores at 500MHz and the DDR3 memory at 450MHz?

Vignesh R · Accepted Answer

Hi GEFO, 
 Add CONFIG_CLOCK_SPEED_500MHZ to the u-boot configuration to run the cpu at 500MHz. 
 You can verify with bootlog and sysfs entry 
 dump init clock rate
CGU0_PLL 500 MHz
CGU0_SYSCLK 250 MHz
CGU0_CCLK 500 MHz


# cat /sys/devices/system/cpu/cpu0/cpufreq/scaling_available_frequencies 
500000 250000 125000 

# cat /sys/devices/system/cpu/cpu0/cpufreq/cpuinfo_cur_freq 
500000 
 Thanks 
 Vignesh R)

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How configure Linux for the ADSP SC587 at 500MHz