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Date: Wed, 26 May 2010 17:05:11 GMT
From: Mayo Jordanov <mayo@oyam.ca>
To: freebsd-gnats-submit@FreeBSD.org
Subject: Serial ports unusable
X-Send-Pr-Version: www-3.1
X-GNATS-Notify:

>Number:         147082
>Category:       kern
>Synopsis:       [uart] Serial ports unusable [regression]
>Confidential:   no
>Severity:       serious
>Priority:       medium
>Responsible:    ed
>State:          open
>Quarter:        
>Keywords:       
>Date-Required:  
>Class:          sw-bug
>Submitter-Id:   current-users
>Arrival-Date:   Wed May 26 17:10:00 UTC 2010
>Closed-Date:    
>Last-Modified:  Fri Nov  4 18:20:07 UTC 2011
>Originator:     Mayo Jordanov
>Release:        RELENG_8_0, RELENG_8
>Organization:
>Environment:
FreeBSD test.local 8.1-PRERELEASE FreeBSD 8.1-PRERELEASE #0: Tue May 25 16:16:39 PDT 2010     root@test.local:/usr/obj/usr/src/sys/GENERIC  amd64
>Description:
Trying to setup a terminal console on FreeBSD, I ran into problems where the console seems to be offline. I've hunted around and the problem may be related to getty and/or uart.

First, I've enabled serial console in /etc/ttys modifying the ttyu0 line to be:
ttyu0	"/usr/libexec/getty std.9600"	vt100	on secure

checking ps axl, it seems that ttyu0 remains in ttydtd.

Any attempt to talk on that serial line failed. Following that, the setup was changed to
ttyu0	"/usr/libexec/getty 3wire.9600"	vt100	on secure

after the change to 3wire, the 3wire consoles are in ttyin wait state.

That did not get me very far, as almost nothing would make it through to/from the console. However, going through different configurations, I've noticed sometimes when I did `kill -HUP 1`, few characters would make is over to the machine running terminal application. Also, with the 3wire setup, plugging in and unplugging USB devices, the messages generated by kernel when a device gets plugged and uplugged would make it over to the listening machine.

Also, at some point I enabled all 4 ttyu consoles (the machine has 4 com ports), and changing all from std.9600 to 3wire.9600 followed by `kill -HUP 1` would only update ttyu0, having to kill ttyu{1,2,3} manually.

Next, I've changed loader.conf and boot.config to run over serial. In this case, there are no problems, and everything including the boot loader is visible over the serial up to the point where getty (presumably) is started. Following this, running shutdown/reboot, the serial terminal is re-activated at some point and I see the tail-end of the shutdown messages over serial terminal as well.

Next, I've tried simple experiment of connecting just two serial terminals together. Text written on the machine that works never made it to the FreeBSD, and vice versa. When the two machines were connected, checking status of the serial line in kermit on at the terminal application resulsts in:
 Device: /dev/cu.KeySerial1
Speed 9600
 Terminal echo: remote
 Terminal bytesize: 8
 Command bytesize: 8
 Parity: none
 Autodownload: on
 Session log: (none)
 Carrier Detect      (CD):  Off
 Dataset Ready       (DSR): On
 Clear To Send       (CTS): On
 Ring Indicator      (RI):  Off
 Data Terminal Ready (DTR): On
 Request To Send     (RTS): On


and on the FreeBSD side resulsts in:
 Device: /dev/cuau3
Speed 9600
 Terminal echo: remote
 Terminal bytesize: 8
 Command bytesize: 8
 Parity: none
 Autodownload: on
 Session log: (none)
 Carrier Detect      (CD):  Off
 Dataset Ready       (DSR): Off
 Clear To Send       (CTS): Off
 Ring Indicator      (RI):  Off
 Data Terminal Ready (DTR): On
 Request To Send     (RTS): On


Please note that the machine used to test against the FreeBSD machine is known to work with serial terminals on number of computers and devices. I've also tried using secondary machine with same results.

I've tried number of terminal appications, including cu, minicom, kermit, and screen. Kermit settings were:
set port /dev/cuauX
set speed 9600
set carrier-watch off
set flow-control none

As for hardware information on the machine, it is Advantech ARK-3360. The serial ports are detected as:
uart0: <16550 or compatible> port 0x3f8-0x3ff irq 4 flags 0x10 on acpi0
uart0: [FILTER]
uart0: console (9600,n,8,1)
uart1: <16550 or compatible> port 0x2f8-0x2ff irq 3 on acpi0
uart1: [FILTER]
uart2: <16550 or compatible> port 0x3e8-0x3ef irq 11 on acpi0
uart2: [FILTER]
uart3: <16550 or compatible> port 0x2e8-0x2ef irq 10 on acpi0
uart3: [FILTER]


>How-To-Repeat:
1) Edit /etc/ttys, do the ttyu0 line reads:
ttyu0	"/usr/libexec/getty std.9600"	vt100	on secure
2) kill -HUP 1
3) Try connecting to it with terminal application

OR
Connect two machines with a serial cable, run terminal application on both. Typing in one should show up on the other.
>Fix:


>Release-Note:
>Audit-Trail:
State-Changed-From-To: open->feedback 
State-Changed-By: remko 
State-Changed-When: Wed May 26 19:42:36 UTC 2010 
State-Changed-Why:  
I send my working serial line to Mayo, set status to feedback 

http://www.freebsd.org/cgi/query-pr.cgi?pr=147082 

From: Mayo Jordanov <mayo@nfy.ca>
To: bug-followup@FreeBSD.org,
 mayo@oyam.ca
Cc:  
Subject: Re: kern/147082: [uart] Serial ports unusable
Date: Thu, 3 Jun 2010 09:49:55 -0700

 Unfortunately, the suggestions Remko sent do not help the situation.
 
 Thanks,
 mayo

From: Mayo Jordanov <mayo@oyam.ca>
To: bug-followup@FreeBSD.org
Cc:  
Subject: Re: kern/147082: [uart] Serial ports unusable
Date: Thu, 3 Jun 2010 18:51:29 -0700

 Just a bit more details on the problem...
 
 I just measured the serial port voltages when I have a com port open in =
 a terminal application (kermit, opening /dev/cuauX device) and there are =
 no voltage changes when hitting keys.
 
 Further, when measuring com1, which is setup as serial console in =
 /etc/ttys, there are expected voltage changes happening during boot, or =
 when kernel messages get generated on console (eg, unplugging a usb =
 device, etc), but there are no changes what so ever at other times (when =
 Login: is supposed to show up, keys are hit, etc).
 
 mayo
 
 

From: Mayo Jordanov <mayo@oyam.ca>
To: bug-followup@FreeBSD.org,
 mayo@oyam.ca
Cc:  
Subject: Re: kern/147082: [uart] Serial ports unusable
Date: Fri, 4 Jun 2010 11:58:17 -0700

 One more report, I loaded FreeBSD 6.4 on this machine, and the serial =
 ports work without any problems.=
State-Changed-From-To: feedback->open 
State-Changed-By: remko 
State-Changed-When: Wed Oct 12 14:48:01 UTC 2011 
State-Changed-Why:  
Hi Ed, are you able to look at this? 


Responsible-Changed-From-To: freebsd-bugs->ed 
Responsible-Changed-By: remko 
Responsible-Changed-When: Wed Oct 12 14:48:01 UTC 2011 
Responsible-Changed-Why:  
Hi Ed, are you able to look at this? 

http://www.freebsd.org/cgi/query-pr.cgi?pr=147082 

From: Mayo Jordanov <mayo@oyam.ca>
To: <bug-followup@FreeBSD.org>, <mayo@oyam.ca>
Cc:  
Subject: Re: kern/147082: [uart] Serial ports unusable [regression]
Date: Fri, 04 Nov 2011 10:59:11 -0700

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 Hi Ed,
 
 Sorry it took me a while to get back to you, but I had the whole setup 
 torn down and the test machines re-purposed for other tasks. I've got 
 the setup back up. Attached are files to answer your questions.
 
 * pstat-boot.log is right after boot, with serial getty disabled
 * pstat-notopen_startgetty.log is after editing ttys, enabling serial 
 console, and kill -HUP 1
 * pstat-open_nodata.log is after having the second machine connected, 
 and serial session open, but nothing sent
 * pstat-open_sentdata.log is after sending some random text
 
 looking at that, the counters don't increment at all, and it seems the 
 device is not even in the right state. Following that, I go back to 
 ttys, edit the serial tty and change it to 3wire mode. kill -9 the 
 getty, kill -HUP 1. (I have to kill -9 the getty first, otherwise hup on 
 init process won't restart it for some reason). Now some data from the 
 console shows up on the client, but only few bytes ("FreeBSD [...]" and 
 few extra characters - which is the beginning of the typical line just 
 before the login prompt on console).
 
 * pstat-open_sentdata2.log is a capture after switching to 3wire mode. 
 I can see counters increased, and the device is in the right state as 
 well.
 
 At this point though, no data is sent over the console again. The only 
 way I can get it to send a few more characters is to edit ttys again, 
 switch to standard mode, kill -9 the serial getty, kill -HUP 1, and 
 switch it to standard mode. kill -9 getty (the serial one), kill -HUP 1, 
 get few bytes, but the device is in the wrong state again, and of course 
 I can't send any more data. Rinse and repeat to get some data over. It 
 seems changing between std mode and 3wire mode seems to flush the 
 console somehow and send a little bit of data.
 
 To reiterate the main points from the previous posts, my cable and the 
 serial ports on the machine are not 3 wire, they are full serial 
 connectors and work as such under OpenBSD and few other OSs I've tried. 
 They work as such under FreeBSD 6.4 as well. They also work without 
 issues during boot - ie. I can see the boot loader over serial no 
 problem and interact with it. Things go south sometime after the kernel 
 is loaded - one of the last things I see on serial console is when the 
 NICs are initialized and IPs set on them (I think that's right about 
 when the system goes multiuser/starts gettys basically?)
 
 Please let me know if you need anything else, my responses should be 
 more prompt now. I am still able to make the machine available for 
 direct access, if necessary. Any help is appreciated, as I'm still 
 struggling to get this to work.
 
 Thank you,
 
 Mayo
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>Unformatted:
