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)
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https://bugs.launchpad.net/bugs/1941622
Title:
Bump unmatched CPU clock rate to 1.5GHz
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