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About changing the internal LDOs voltage in i.MX6DQ.

Question asked by Keita Nagashima on Oct 6, 2015
Latest reply on Oct 22, 2015 by Keita Nagashima

Dear All,


Hello. We'd like to change the internal LDOs voltage.

Could you tell me the way of proper setting about below LDOs?

(We'd like to know the setting in u-boot and kernel.)

OS: jb4.2.2_1.1.0


[LDO's output voltage]

- LDO_SOC (VDD_SOC_CAP) : 1.275V   //for DDR clock Jitter

- LDO_ARM (VDD_ARM_CAP) : 1.250V   //for ARM freq up (1GHz)

- LDO_PU (VDD_PU_CAP) : 1.275V   //for VPU freq up (352MHz)

- LDO1P1 (NVCC_PLL_OUT) : 1.175V   //for DDR clock Jitter

- LDO2P5 (VDD_HIGH_CAP)  : 2.700V    //for DDR clock Jitter


[Other information]

> ARM freq up (1GHz)

Change the ARM clock

$ echo userspace > /sys/devices/system/cpu/cpu0/cpufreq/scaling_governor

$ echo 996000 > /sys/devices/system/cpu/cpu0/cpufreq/scaling_setspeed


> VPU freq up (352MHz)

Add the kernel config (menu config)

  [*] MX6 VPU 352MHz


Best Regards,