Ubuntu
u-boot package

  1. Bug #1941622
  2. Comment #1

Comment 1 for bug 1941622

Revision history for this message
Heinrich Schuchardt (xypron) wrote : Re: Bump unmatched CPU clock rate to 1.5GHz

The CPU clock rate is currently set in U-Boot SPL. SiFive said that there are boards that are unstable over 1.2 GHz. So raising to 1.5 GHz is not an option.

Currently the shut of temperature of the CPU is 108 °C. In the SiFive repo there is a patch for lowering this to 85°C. I would advise not to change the clock speed via the U-Boot dtb without adjusting the CPU temperature limit too.

$ sensors # from lm-sensors package
tmp451-i2c-0-4c
Adapter: i2c-ocores
M/B Temp: +46.1°C (low = +0.0°C, high = +85.0°C)
                       (crit = +85.0°C, hyst = +75.0°C)
CPU Temp: +48.2°C (low = +0.0°C, high = +85.0°C)
                       (crit = +108.0°C, hyst = +98.0°C)