linux 怎么判断串口是否存在

donotgiveup

请高手支招?

没有串口的机器也有/dev/ttyS0,也可以打开啊...

有没有人碰到过类似的问题,串口也是一种外设,intel的cpu是不会自带的.
PC上是接哪个总线呢?

accessory

http://linux.koolsolutions.com/2 ... under-debian-linux/

Check if Linux detects your Serial Port or not

There are many ways to do that. One way you could do is to give the following command:
# dmesg | grep ttyS

You should see something like this:
serial8250: ttyS0 at I/O 0x3f8 (irq = 4) is a 16550A
serial8250: ttyS1 at I/O 0x2f8 (irq = 3) is a 16550A
00:09: ttyS0 at I/O 0x3f8 (irq = 4) is a 16550A
00:0a: ttyS1 at I/O 0x2f8 (irq = 3) is a 16550A

The above output shows that your COM1 and COM2 ports are available and Linux recognizes them.

Another way to test is to give the following command:
# ls > /dev/ttyS0

If the command does not return any error message then your Serial Ports are recognized by your Linux system.

可以搜下那个DMESG 信息是怎么打出来，如何实现的。