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

[Heinrich Schuchardt]

** Summary changed:

- [SRU] Bump unmatched CPU clock rate to 1.5GHz
+ [SRU] Bump unmatched CPU clock rate to 1.2 GHz

** Description changed:

  [Impact]
  
- Bump unmatched CPU clock rate to 1.5GHz
+ Bump SiFive Unmatched CPU clock rate from 1.0 GHz to 1.2 GHz as used by
+ upstream U-Boot.
  
- 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.
+ 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 to 1.5GHz.
+ overheating. CPU clock speed is increased form 1.0 GHz to 1.2 GHz.
  
  [Where problems could occur]
  
-  * Overheating, instability, panics.
+  * Overheating, instability, panics. (Should not occur according to the
+ board vendor)
  
  [Other Info]
   
-  * wgrant & multiple forum users report this configuration to be stable
+  * wgrant & multiple SiFive forum users report even 1.5 GHz to be stable

** Tags added: riscv64

-- 
You received this bug notification because you are a member of Ubuntu
Sponsors Team, which is subscribed to the bug report.
https://bugs.launchpad.net/bugs/1941622

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

To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntu/+source/u-boot/+bug/1941622/+subscriptions