[Bug 1941622] Re: Bump unmatched CPU clock rate to 1.5GHz

[Heinrich Schuchardt]

The relevant U-Boot patch to change the CPU max temperature to 85 °C (in
U-Boot) is here:

https://github.com/sifive/meta-sifive/blob/2021.08/recipes-
bsp/u-boot/files/unmatched/0012-board-sifive-spl-Set-remote-thermal-of-
TMP451-to-85-.patch

This patch has not been sent upstream yet.

For the HiFive Unleashed there is a patch series defining multiple
operating points that has been rejected by upstream. I did not see the
same for the HiFive Unmatched:

[PATCH 0/3] Dynamic CPU frequency switching for the HiFive
https://lore.kernel.org/linux-riscv/1592308864-30205-1-git-send-email-yash.shah@sifive.com/
https://github.com/sifive/meta-sifive/blob/2021.08/recipes-kernel/linux/files/0010-riscv-sifive-unleashed-define-opp-table-cpufreq.patch

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https://bugs.launchpad.net/bugs/1941622

Title:
  Bump unmatched CPU clock rate to 1.5GHz

Status in u-boot package in Ubuntu:
  New

Bug description:
  [Impact]

  Bump unmatched CPU clock rate to 1.5GHz

  Multiple users report that running unmatched at 1.5GHz is stable, and
  gives one performance.

  Lets bump clock speed to 1.5GHz in u-boot and kernel.

  [Test Plan]

   * System with these patches boots, operates normally without
  overheating. CPU clock speed is increased to 1.5GHz.

  [Where problems could occur]

   * Overheating, instability, panics.

  [Other Info]
   
   * wgrant & multiple forum users report this configuration to be stable

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