Miro i need the specific size for system. 0x0f80000 is no use
Open /build/core/definitions.mk. In this file, search for 'false'. You will find one entry with some code about system size around it. Change this 'false' to 'true', and build again. Yo...
Unzip it to a folder in your home directory of cygwin, probably C:\cygwin\home\username\kernel-build-dir.
Then in the cygwin shell, do cd kernel-build-dir. Then type the name of the program you want to execute (follow the steps in your guide).