digi serial console

Historical origins of the terminalThe initial computer is expensive, so a computer is generally used by multiple people at the same time. In this case, a computer needs to connect many sets of keyboards and monitors for more than one person to use. In the past, there is a device that can connect to a computer, only a monitor and keyboard, and a simple processing circuit, which itself does not have the ability to process computer information, he is responsible for connecting to a normal computer

*/BreakNewcon->flags |= con_enabled;Newcon->index = c->index;if (i = = Selected_console) {Newcon->flags |= Con_consdev;Preferred_console = Selected_console;}Break}if (Newcon->flags Con_printbuffer) {//The BUF information is printed only if Con_printbuffer is set/** Console_unlock (); Would print out the buffered messages* For us.*/Raw_spin_lock_irqsave (logbuf_lock, flags);Console_seq = Syslog_seq;Console_idx = Syslog_idx;Console_prev = Syslog_prev;Raw_spin_unlock_irqrestore (logbuf_lock, flag

Console classification1. Menu-based console, select menu to execute command2. Analytic console to execute commands by entering commandsprintf (), scanf () function porting1. function with variable parameter2. Printing information to the serial port3. The key is to convert the argument to a string, and the correlation f

Linux kernel print data to serial console issuesOriginal source: Http://i.cnblogs.com/EditPosts.aspx?opt=11. View the current console's print levelCat/proc/sys/kernel/printk4 4 1 7Where the first "4" represents the print level of the kernel print function PRINTK, only information that is higher than his level can be printed on the console, with 0-3 levels of info

Console is on a serial deviceNo further output will appear on this output deviceOn the screen, the black screen shows that the console is on a serial device no further output will appear on this output device keyboard and mouse does not respond. Telnet connection should be OK, this problem was discovered when I used KV

display serial baud rate and other information:Stty-f/dev/ttyths2-a #dev/TTYTHS2 for the selected port numberparameter settings:Stty-f/dev/ttyths2 ispeed 115200 ospeed 115200 cs8Configure the baud rate 115200 data 8bit, generally set these two parameters can be, if the display data garbled, may also need to set other parameters, use man to view Stty other settings options.Send serial data:Echo 123>/DEV/TTYT

. Compilation successful again.Since this modification only for the u-boot.bin, there is no impact on the u-boot-spl.bin, so you can just burn the u-boot.bin to the SD card fanArea 32. Well, after transplantation for so long, the console can finally see the effect. Try the basic U-boot command: After so many days, the results have finally been achieved, and the subsequent things have been improved on this basis. I put this version of the code here: