Igor - the referenced Toaster manual version is old (Revision 1.8 2015) and does not correspond to the 4.1.15_2.0.0 release which uses Krogroth. The presentation is from 2014-10-17 and a lot has changed since then.
Do you know which version of Krogroth was released with 4.1.15_2.0.0? Release date for 4.1.15_2.0.0 says 2017-01-18 which makes me think that it might be Krogroth 2.1.1 (2016-08) or 2.1.2 (2016-12), but from page 2, 2nd paragraph to last of the "i.MX Yocto Project User's Guide" document it says:
"Release L4.1.15_2.0.0_ga is released for Yocto Project 2.1 (Krogoth). The same recipes for Yocto Project 2.1 are going to be
upstreamed and made available on the next release of the Yocto Project release. The Yocto Project release cycle lasts roughly
six months."
That would be Revision 2.1 from 2016-04, is that correct?