Hardware Reference
In-Depth Information
The following combination of parameters may set a permanent bit in your
SoC chip and void your warranty. While the Raspberry Pi announcement
( www.raspberrypi.org/introducing-turbo-mode-up-to-50-more-performance-for-free/ )
speaks of overclocking without voiding the warranty, it is subject to some conditions like
using the cpufreq driver. The following conditions may put your warranty in jeopardy:
ver_voltage > 0, and at least one of the following:
force_turbo = 1
current_limit_override = 0x5A000020
temp_limit > 85
Force Turbo Mode
The documentation indicates that force_turbo has no effect if other overclocking options
are in effect.
By default, force_turbo is disabled. When disabled, it disables some other
configuration options such as h264_freq . However, enabling force_turbo also enables
h264_freq , v3d_freq , and isp_freq .
force_turbo
Description
0 (default)
Enables dynamic clocks and voltage for the ARM core, GPU core,
and SDRAM. In this mode, settings for h264_freq , v3d_freq , and
isp_freq are ignored.
1
Disables dynamic clocks and voltage for the ARM core, GPU core,
and SDRAM. Configuration option values h264_freq , v3d_freq , and
isp_freq apply when specified.
Initial Turbo
The initial_turbo option is described in config.txt as “enables turbo mode from boot
for the given value in seconds (up to 60).” This is somewhat confusing.
What is meant is that turbo mode will be enabled after a delay of a configured
number of seconds after boot. By default, if turbo mode is enabled, it is enabled
immediately (after examining config.txt ).
 
 
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