If you are using minicom - try to check what are the options in menu:
press: "ctrl-a o"
and go to “serial port setup”
there should be:
F- hardware Flow Control: No
G - software flow control: No
What do you mean by “cannot type any word or password by keyboard”? Do you mean that there is no echo of typed characters?
Second thing - there may some problem with the filesystem on your SD card, because kernel mounted it as a read-only.