over_voltage has no effect on RPi Zero

[Fourdee]

As per: https://www.raspberrypi.org/forums/viewtopic.php?p=1045575#p1045575

over_voltage value has no effect on vcore when measured with vcgencmd measure_volts

Notes:

• Zero 1.3
• 4.4.21+
• Performance CPU gov.
• Get core voltage with: vcgencmd measure_volts
• Default core voltage =1.3500V

over_voltage=6
volt=1.3500V

current_limit_override=1
over_voltage=8 | warranty bit now set
volt=1.3500V

[popcornmix]

current_limit_override has been a default setting for more than 3 years and the config.txt option no longer exists.
Try setting force_turbo=1 or temp_limit=86 to force warranty bit and allow over_voltage > 6

[Fourdee]

@popcornmix

Caused by same issue as: #667 (comment)

Setting initial_turbo=x prevents over_voltage=x being applied.

Disabling initial_turbo=x resolves issue:

root@DietPi:~# vcgencmd measure_volts
volt=1.4000V
root@DietPi:~# cat /DietPi/config.txt | grep over_volt
over_voltage=2
root@DietPi:~# cat /DietPi/config.txt | grep initial_tur
#initial_turbo=20

[JamesH65]

Closing this issue as questions answered/issue resolved.