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

[Heinrich Schuchardt]

To check that the patch has the desired effect I ran

    glpsol -m /usr/share/doc/glpk-utils/examples/tsp.mod

with different U-Boot versions and noted down the solution time:

1.0 GHz - 5.2 s - current Focal U-Boot version
1.2 GHz - 4.3 s - revised Focal U-Boot version
1.5 GHz - 3.5 s - my board works fine at 1.5 GHz

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

Status in u-boot package in Ubuntu:
  In Progress
Status in u-boot source package in Focal:
  In Progress

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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