Since MDK 5.35, Xtal is greyed out as <undefined> in Options for target -> Target.
There was no problem in the version 5.33.
How do you set the value of the external oscillator?
Yes but with the evaluation version it is not possible to download the previous versions...
I was just supplying the information for completeness (bug tracking), I wasn't suggesting a downgrade.
Sorry. Thank you for your contribution.