Replying to my own question in case somebody else has the same issue, since i wasted a lot of time on this.
Tarballs are saved in /home/src/ folder. You can create folder manually and place any missing files there. The crosstool will not try download them if they are found.
PS
I am analog and rf designer, not a software guy, so I don’t know how to force the process to use alternative repository. If someone else knows it I would be grateful for the explanation.