I have finally found my problem.
First of all, anybody can use "fpc -Parm -i" to see what CPUs are supported. I see that ARM7 is supported.
Additionally, there are several people helping bug solve process on WinCE 6.5 versions. So, I can say WinCE version supported is at least 6.5.
Regarding my problem, it turned out that I need to use below code in the OnLoad event of main form to be able to see my form.
Self.Top := 0;
Self.Left := 0;
If need to see Title bar set Top to 25 or 26.
For some reason below properties are not working on WinCE platform:
BorderStyle
WindowSize
BorderStyle seems to be bsDialog or bsSingle with no sizing available. Linked to this, WindowSize := wsMaximized is not working.
Just my findings related with my problem. Putting here to support people that hit same problem as me.
Regards,
Ertan