>> 1) I assume this is a runtime change that happens after updating the u-boot
>> packages on an installed SiFive drive, right? Does the change happen 
>> instantly
>> after upgrade of the package? Or on next reboot?

The change is only visible after rebooting.

>> 2) The test case is not too clear about how one checks if the patch is in
>> effect or not. How can one confirm that the effective CPU clock speed is
>> now different? Is it just a matter of `cat /proc/cpuinfo`?

You can check that in U-Boot that the control device tree has the new
setting:

fdt addr $fdtcontroladdr
fdt print

For measuring the actual speed I used package glpk-utils.

I measured the execution time of the command

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

I suggest to check both before and after upgrade.

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

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

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