Hi Tuma,
Help me please in writting new U-Boot commands. What should I do? I should write new file in "/common", something like cmd_****, am I right?
This really depends if you want to implement a command which is useful for all boards, then it should be below common/ or if it is special to one board. Then it should go into the board directory.
So where can I read about cmd_-file structure and how should new commands be added?
You have all the source to study. Look into how other people do it. Search the history for commits adding new commands and study them. For example this commit[1] adds new commands to an already existing file, but it is a start.
And how can I add my new file to U-Boot binary?
Make sure it is mentioned in the relevant Makefile.
Cheers Detlev
PS: Is the LCD display working now?
[1] http://git.denx.de/?p=u-boot.git;a=commitdiff;h=02c9aa1d41f73fdcf8383a36cc0c...