Hi,
I’ve RouterOS 5.25 installed on a XenServer and it runs great, yesterday I tried to update it to 6.15 and after a rebooted the unit it never came back…so I had to re-install, and decided to try with the RouterOS 6.15 ISO, but didn’t boot, then tried with 6.14 and 6.13 and same thing…then tried to boot from 5.26 ISO and worked perfectly. I downloaded the ISOS directly from the mikrotik.com/download site.
The viridian extensions are Microsoft extensions required for Windows 8 support and are enable by default. There is a problem in the detection logic in newer kernels (like in RHEL 6.4). The logic comes to the conclusion that it is running under HyperV rather than Xen.