[Bug 1941622] Re: [SRU] Bump unmatched CPU clock rate to 1.2 GHz

[Heinrich Schuchardt]

SRU testing
===========

I have tested on an SiFive HiFive Unmatched board using a fully updated
Focal server image on an SD card.

Before the new package:

U-Boot 2021.01+dfsg-3ubuntu0~20.04.3 (Jul 30 2021 - 14:38:17 +0000)
glpsol -m tsp.mod
Time used:   5.1 secs

With the new package:

https://launchpad.net/ubuntu/+source/u-boot/2021.01+dfsg-3ubuntu0~20.04.4/+build/22598935/+files/u-boot-
sifive_2021.01+dfsg-3ubuntu0~20.04.4_riscv64.deb

U-Boot 2021.01+dfsg-3ubuntu0~20.04.4 (Sep 21 2021 - 15:55:38 +0000)
glpsol -m tsp.mod
Time used:   4.5 secs

The new U-Boot results in the expected speedup of programs.
The system runs stable.

Best regards

Heinrich

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

Title:
  [SRU] Bump unmatched CPU clock rate to 1.2 GHz

Status in u-boot package in Ubuntu:
  Fix Released
Status in u-boot source package in Focal:
  Fix Committed

Bug description:
  [Impact]

  Bump SiFive Unmatched CPU clock rate from 1.0 GHz to 1.2 GHz as used
  by upstream U-Boot.

  This is the maximum frequency that according to SiFive is stable on
  all boards.

  [Test Plan]

   * System with these patches boots, operates normally without
  overheating. CPU clock speed is increased form 1.0 GHz to 1.2 GHz.

  [Where problems could occur]

   * Overheating, instability, panics. (Should not occur according to
  the board vendor)

  [Other Info]
   
   * wgrant & multiple SiFive forum users report even 1.5 GHz to be stable

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