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a matrox frame grabbing card was installed in my ubuntu 18.04,and I tried to using blow commands to check the serial port configuration:

[serial port configuration1

As you can see,the lspci output tells grabbing card has

IRQ 16 and port e000,

and the output of

sudo cat /proc/tty/driver/serial

has none of record matches the ouptut of lspci by IRQ and IO port,so I tried to use this command to mapping:

sudo setserial  /dev/ttyS2 port 0xe000 irq 16 uart 16550A baud_base 460800 divisor 4

but get a result like this:

Cannot set serial info: Device or resource busy

It seems like the grabbing card has been mapped already,so I assume the one of record 0 or 4 represents the grabbing card possible card port mapping

and tried to run the tests provided by matrox,but none of them works.

Then I unplugin grabbing card from PCI-X slot,and enter into linux,but

sudo cat /proc/tty/driver/serial

still gives the same output as grabbing card installed,and it seems none of record 0 or 4 represents grabbing card on the contrary,and this is quite confusing.

My first questions are:

  1. Must the output of lspci match with one of the records of in /proc.../serial by the IRQ and IO-Port if serial port mapped correctly?

  2. If NO,How do I know which serial record in /proc.../serial represents the grabbing card? If Yes,since I got 'device busy',How to put grabbing card to idle?

Alex Luya
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  • Why do you think that the *"matrox frame grabbing card"* has a serial port? Does the product spec confirm the existence of such a serial port? FYI *"I/O ports"* does not indicate the existence of any serial port(s). – sawdust Feb 02 '21 at 22:16
  • @sawdust local agency of matrox gives me a doc to map serial port – Alex Luya Feb 02 '21 at 23:06
  • What does the *"doc to map serial port"* contain? What kind of UART is implemented? What are the register names and port addresses? Are there register descriptions? Assuming that the *"I/O port"* addresses are memory mapped (rather than port addresses), you could use the **devmem2** utility to read those registers from the shell. – sawdust Feb 03 '21 at 00:51
  • Not provided,can you answer my question – Alex Luya Feb 03 '21 at 02:12

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