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-   -   Determine if Linux will recognize serial ports. (https://www.linuxquestions.org/questions/linux-newbie-8/determine-if-linux-will-recognize-serial-ports-4175513778/)

ferite 08-06-2014 06:12 PM
Determine if Linux will recognize serial ports.
 
I want to purchase this board. But I need to make use of serial ports. So I need to know if Linux or some distros of Linux would recognized the serial ports onboard. The manufacturer only offers drivers for Windows. As the board is not open source, I don't know what is the UART Controller chip. However if I open the .inf file of Windows drivers it is said:

;Installation Notes:
; Using Devcon: Type "devcon update iaiouart.inf ACPI\INT33C4" to install on FPGA platforms
; Using Devcon: Type "devcon update iaiouart.inf ACPI\INT33C5" to install on FPGA platforms

After that I think the controller chip must be ACPI\INT33C4.

Thanks.

jefro 08-06-2014 07:28 PM
You need to look for uart name and type.

ferite 08-06-2014 07:44 PM
Quote:
Originally Posted by jefro (Post 5216569)
You need to look for uart name and type.
Jefro. Is it possible to do this without having the board yet?

DavidMcCann 08-07-2014 12:07 PM
My computers have serial ports, but it's a long time since I used them. I certainly never installed a driver: I think a driver is only needed for a plug-in serial card. Here's a good place to start:
http://tldp.org/HOWTO/Serial-HOWTO.html

michaelk 08-07-2014 12:44 PM
Quote:
With its ultra-small form factor design and support for Linux* and Windows* embedded operating systems
http://linuxgizmos.com/intel-nuc-use...as-kit-or-sbc/

Basically a small form factor PC so I would also conclude that the serial ports should work and no drivers required.

suicidaleggroll 08-07-2014 12:57 PM
I use serial ports all the time, on everything from Windows PCs to Linux PCs to Linux embedded systems, and I've never had to go out of my way to install any drivers for them.

Actually I take that back, I did have to go out of my way once when I was trying to use a USB to serial adapter on a Mac. Why does Apple have to make everything so difficult?

ferite 08-07-2014 02:05 PM
Hi. to tell the truth, according with my experience, when a computer has serial ports, it was always a matter of start an OS, and the serial ports were there. What worried me about this, is that at the download page there is a driver for Windows, so I assumed that from some reason this serial controller was hard to be recognized.

jefro 08-07-2014 02:38 PM
It is almost a 100% chance this board will support some form of serial. Some of these nuc cards (not this one) have a fancy dual 485/232 port in them. I doubt that would even be an issue. Serial has been around for so long and so much an embedded part of boards that we don't see issues anymore except forgetting how to set them up.

For the most part the serial uart chip is one of the original parts of an x86. It is not an add on part. If for some reason your distro doesn't support the uart chip then you should be able to get it added.

Again, Intel is of the most well supported boards I've known. They offer excellent documentation.

http://downloadmirror.intel.com/2374...ProdSpec04.pdf

Show that the cpu has morphed into basically a single device. The only thing is has is a driver for the serial.

The only time I ever saw any issue was with a new type very high speed serial chip. Not sure anyone even uses it anymore.

DavidMcCann 08-08-2014 11:27 AM
Quote:
Originally Posted by ferite (Post 5217064)
What worried me about this, is that at the download page there is a driver for Windows, so I assumed that from some reason this serial controller was hard to be recognized.
I don't know Windows, but doesn't it need a separate driver for everything? My monitor came with a Windows installation disk, but it must be 10 years since Linux had to be told a monitor's parameters.

jpollard 08-08-2014 04:31 PM
It LOOKS like it is supported by Linux (I found driver references for INT33C4 for setting a serial clock). It appears to be a "Intel Lynxpoint". But from the product images, it may be a bit tricky to use as there are no visible plugs for the serial ports on the board. It is only identified as "serial ports header" and is covered up by the reference number, so some additional circuitry may be needed to turn them into two serial ports (it doesn't look large enough for a full set of pins...).

jefro 08-08-2014 04:34 PM
It has two headers for serial.

jpollard 08-08-2014 05:47 PM
Quote:
Originally Posted by jefro (Post 5217751)
It has two headers for serial.
Could be - the image I see in the document is too low a resolution to be sure. I can only find one "18" (serial ports header) referenced, implying both are in the same place, but no sockets, and perhaps the pins are covered up by the reference number.

ferite 08-28-2014 05:52 PM
I just received the board. After booting Ubuntu (Live) 10.04 LTS, I run some commands to check if the ports are recognized:

Code:
root@ubuntu:/home/ubuntu# setserial -g /dev/ttyS[0123]

/dev/ttyS0, UART: 16550A, Port: 0x03f8, IRQ: 4
/dev/ttyS1, UART: unknown, Port: 0x02f8, IRQ: 3
/dev/ttyS2, UART: unknown, Port: 0x03e8, IRQ: 4
/dev/ttyS3, UART: unknown, Port: 0x02e8, IRQ: 3
Code:
root@ubuntu:/home/ubuntu# dmesg | grep tty

[    0.000000] console [tty0] enabled
[    4.355709] serial8250: ttyS0 at I/O 0x3f8 (irq = 4) is a 16550A
Does it mean that there is just one port being recognized?. By the record, according to the manual, the board has 2 serial ports, via a 10 pin header.

jpollard 08-28-2014 06:28 PM
That is what it looks like. On my system (only two ports):
Code:
# setserial -g /dev/ttyS[0123]
/dev/ttyS0, UART: 16550A, Port: 0x03f8, IRQ: 4
/dev/ttyS1, UART: 16550A, Port: 0x02f8, IRQ: 3
/dev/ttyS2, UART: unknown, Port: 0x03e8, IRQ: 4
/dev/ttyS3, UART: unknown, Port: 0x02e8, IRQ: 3
so it is also possible the "unknown" is used to also mean "nonexistent".

ferite 08-29-2014 10:26 AM
This is not good for me. I was needing both ports.


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