On Thu, Sep 15, 2016 at 11:50 PM, <Valdis.Kletnieks@vt.edu> wrote:
On Thu, 15 Sep 2016 23:19:51 +0300, Ran Shalit said:
Isn't writing to console, the same as outputing chars to serial ?
No. For instance, consider any laptop where "console" is an LCD screen, and if it's recent hardware, there isn't a UART anywhere in the device, nor is there a serial port to connect to. Or any system where virtual terminals are in the config, for that matter.
Then there's netconsole, console-over-USB, and heaven knows what other variations.
See Documentation/console/console.txt for more information.
Hi, I seen in kernel tty drivers examples where there are both callback for serial (start_tx, etc) , and for console (register_console). I am not sure what reason for having a driver support both console and serial. when there is serail it means there is a uart consoller, according to my understand the console routine also implement put_char with the same uart console (not graphic display for example), so it seems like duplication. I am probably miss understand something. Thanks you, Ran