kern/166805: Winbond W83627DHG-P serial console hang

Fri Mar 15 11:00:03 UTC 2013

The following reply was made to PR kern/166805; it has been noted by GNATS.

From: Oleg Yurkivskyy <oleg at realnet.com.ua>
To: bug-followup at FreeBSD.org, yoitsmeremember at gmail.com
Cc:  
Subject: Re: kern/166805: Winbond W83627DHG-P serial console hang
Date: Fri, 15 Mar 2013 12:48:01 +0200

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 There is a workaround for this problem.
 Just add

 hint.apic.0.disabled="1"

 into /boot/device.hints or /boot/loader.conf in order to disable APIC 
 support (see man apic) and enable legacy PIC driver.

 The problem itself has something to do with invalid interrupt config on 
 Intel D2500CC (or similar).
 Legacy atpic driver just ignores incorrect settings for interrupt 
 handling (

 trig  ==  INTR_TRIGGER_EDGE  &&  pol  ==  INTR_POLARITY_LOW)  ||   (trig  ==  INTR_TRIGGER_LEVEL  &&  pol  ==  INTR_POLARITY_HIGH

 )

 while apic forcing these incorrect settings, resulting interrupts not 
 being handled properly.

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     There is a workaround for this problem.<br>
     Just add<br>
     <br>
     hint.apic.0.disabled="1"<br>
     <br>
     into /boot/device.hints or /boot/loader.conf in order to disable
     APIC support (see man apic) and enable legacy PIC driver.<br>
     <br>
     The problem itself has something to do with invalid interrupt config
     on Intel D2500CC (or similar).<br>
     Legacy atpic driver just ignores incorrect settings for interrupt
     handling (
     <pre><font color="#2040a0">trig</font> <font color="4444FF">=</font><font color="4444FF">=</font> <font color="#2040a0">INTR_TRIGGER_EDGE</font> <font color="4444FF">&</font><font color="4444FF">&</font> <font color="#2040a0">pol</font> <font color="4444FF">=</font><font color="4444FF">=</font> <font color="#2040a0">INTR_POLARITY_LOW</font><font color="4444FF">)</font> <font color="4444FF">|</font><font color="4444FF">|</font>  <font color="4444FF">(</font><font color="#2040a0">trig</font> <fon t color="4444FF">=</font><font color="4444FF">=</font> <font color="#2040a0">INTR_TRIGGER_LEVEL</font> <font color="4444FF">&</font><font color="4444FF">&</font> <font color="#2040a0">pol</font> <font color="4444FF">=</font><font color="4444FF">=</font> <font color="#2040a0">INTR_POLARITY_HIGH</font></pre>
     )<br>
     <br>
     while apic forcing these incorrect settings, resulting interrupts
     not being handled properly.<br>
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