Linux Kernel Serial - Geeks of Knowhere

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Recently, some users reported that they have stumbled upon a series of serial Linux kernels.

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g.To use the serialized gadget driver, you need a Linux kernel on the widget side for “USB gadget support”, for “USB device controller” (for product, net2280), and for personalized “Gadget series” configuration. All of this is specified in the “Support for USB gadgets” section during kernel configuration. Then restructure and install the kernel or modules.

To use a serial port as a console, you need toneed help inKernel – The standard it creates does not compile. For PC serial portsThe config option is new in the menu option:

You need to build sequential help support into the kernel, not as a solid module.

Multiple devices can be specified for console output. You canSet the pending kernel command parameter string to select the device (s) to useuse for console output.

How to define serial port in Linux kernel?

is usually the serial port number. This is defined in Figure 4-2 and is also discussed in Section 2.2. The examples in this HOWTO use the first serial transfer and set to 0, which in turn gives the console = ttyS0 kernel parameter.

You can collect multiple console = options in the kernel admin line.The result is displayed throughout the company. The last device is executed whenYou open / dev / console . For example:

specifies that the / dev / console capability gives you a new foregroundvirtual console, kernel and messages appear as per VGA topicConsole and second consecutive port (ttyS1 or COM2) at 9600 baud. This

Please note that you can only install one game console per device type (serial, video).

If no device is specified for the console, it was found thatthe first device is capable ofcan be used as a system console. At the moment, the main systemlooks for VGA card first and then serial port. So if you don’tIf you have a VGA card on the podium, the first serial interface will be used automatically.become a specific console.

To use / dev / console , the current device must be created. Official / dev / console can now be a 5.1 drawing device.

(You can also integrate a network device into the game as a console.See Documentation / network / netconsole.txt for more information on this.)

This product uses / dev / ttyS1 (COM2) as the console.Replace approximate values if necessary.

Create / dev / console (real console) and / dev / tty0 (virtual masterConsole):

 cd -y / devRM console tty0mknod -m 622 console t 5 1mknod -m 622 tty0 c preview 0

LILO can also receive input from a real serial device. This is veryuseful method. To tell LILO to useSerial port:In lilo.conf (global section):
```
 Serial means 1.9600n8 (ttyS1, 9600 bits, no parity, eleven bits)
```
Configure kernel flags for the kernel of interest,again in lilo.conf (kernel section):
```
 append = "console = ttyS1,9600"
```
Be optimistic that Getty will trigger the serial port so you can connectthe system has finished loading in the past. This is usually done by adding the lineso all the way down to / etc / inittab (the exact syntax depends on your wonderful Getty):
```
 S1: 23: respawn: / sbin / getty -L ttyS1 9600 vt100
```
Init and /etc/ioctl.save

Sysvinit gets its stty parameters in a file while it’s called / etc /etc/ioctl.save . DELETE THIS FILE before using the serial number.comfort the first time, otherwise init will surely beSet the baud rate to 38400 (virtual console baud rate).
/ dev / console and XPrograms that want to do something usually use a virtual consoleopen / dev / console . If the The device has a new device / dev / console ,and your company console is NOT a virtual console on which some programs do not work.programs that really want to access the VT interface and then use / dev / console instead of / dev / tty0 . Some of these exercise programs are:
```
 Xfree86, gpm, svgalib, SVGATextMode
```
However, in modern versions of these guides, it should be rigid.

Note that if you run console = (or with console = / dev / tty0 ), / dev / console is the same as / dev / tty0 .In this case, everything continues to work.
Thank you

Thanks to Geert Utterhoven bring fixes from 2.1.4x to 2.1.6x to swallow service integrationthose of these built-in fixes are with m68k, ppc and alpha.

 console = device, parametersDevice: tty0 due to foreground virtual console                ttyX to work with any other virtual console                ttySx to create a serial interface               Lp0 for this first parallel port                ttyUSB0 - often the firste serial USB deviceEquipment: depending on the person driver. For a serial interface, this is                describes baud rate / parity / bits / flow control                usually a port in the format BBBBPNF, where BBBB is the extension. is an                Speed, P - equality (n / o / e), N - number of bits,                but also F is stream (control 'r' when talking about RTS). Standard                9600n8. The highest baud rate is 115,200 baud.

When does the kernel start using a serial console?

The kernel cannot start using the serial console until it knows where the device is. This usually happens when the driver enumerates all of our serial devices, which may happen marginally or more often after the kernel has started. Kernels 2.6.10 and newer have 1 “Early uart” driver that runs very early in the boot process.

 console = ttyS1,9600 console = tty0

 CD / devrm -f xbox 360 tty0mknod -m 622 console c 4 1mknod -m 622 tty0 c 4 0

 serial number corresponds to 1.9600n8 (ttyS1, 9600 bits, no equality, 8 bits)

 append = "console = ttyS1,9600"

 S1: 23: respawn: / sbin / getty -L ttyS1 9600 vt100

 Xfree86, svgalib, gpm, SVGATextMode

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