The RK3399 Overclock/Undervolt/Voltages Thread

[generaleramon]

one funny thing i found out changing the SD bus clock... if i start the laptop with the sd inserted i get this bus speed:

Code:

cat /sys/kernel/debug/mmc1/ios
clock:          50000000 Hz
actual clock:  50000000 Hz
vdd:            18 (3.0 ~ 3.1 V)
bus mode:      2 (push-pull)
chip select:    0 (don't care)
power mode:    2 (on)
bus width:      2 (4 bits)
timing spec:    2 (sd high-speed)
signal voltage: 0 (3.30 V)
driver type:    0 (driver type B)

with and average read rate of 21.2MB/s and an average latency of 0.73msec

simply by reinserting the sd after the login a get this:

Code:

clock:          200000000 Hz  (150000000 is the default max clock)
actual clock:  200000000 Hz
vdd:            18 (3.0 ~ 3.1 V)
bus mode:      2 (push-pull)
chip select:    0 (don't care)
power mode:    2 (on)
bus width:      2 (4 bits)
timing spec:    6 (sd uhs SDR104)
signal voltage: 1 (1.80 V)
driver type:    0 (driver type B)

58.6MB/s Read (peaks of 80MB/s) and 0.57msec Latency