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[Bug #1184] serial command freezes grub if serial redirection of BIOS is


From: nobody
Subject: [Bug #1184] serial command freezes grub if serial redirection of BIOS is enabled
Date: Fri, 13 Sep 2002 09:15:43 -0400

=================== BUG #1184: LATEST MODIFICATIONS ==================
http://savannah.gnu.org/bugs/?func=detailbug&bug_id=1184&group_id=68

Changes by: Henrik Nordstrom <address@hidden>
Date: 2002-Sep-13 13:15 (GMT)

------------------ Additional Follow-up Comments ----------------------------
Because the serial redirection of these boards is crap, only useful for getting 
access to the BIOS in emergencies. Having native serial is highly preferable. 
The BIOS redirection does some kind of screen scraping to detect screen updates 
and often misses stuff.

The BIOS is somehow supposed to detect when the application uses the serial.

Should perhaps note that the serial support of LILO seems to work just fine 
even with BIOS console redirection enabled, and so does DOS. To my knowledge it 
is only GRUB who crashes..

Note: The serverity is of this bug is only minor. But until it is fixed it 
might be good to know that there is such issues and is why I registered the bug 
report.



=================== BUG #1184: FULL BUG SNAPSHOT ===================


Submitted by: hno                       Project: GNU GRUB                       
Submitted on: 2002-Sep-11 16:30
Category:  Terminal                     Severity:  Major                        
Priority:  Normal                       Bug Group:  Software Error              
Resolution:  None                       Assigned to:  None                      
Status:  Open                           Release:  CVS                           
Reproducibility:  Every Time            Planned Release:                        

Summary:  serial command freezes grub if serial redirection of BIOS is enabled

Original Submission:  On certain boxes the serial command freezes grub. This is 
seen primarily on Intel motherboards with serial redirection of the BIOS screen 
enabled.

Might be related to a prior report on the grub-bug mailinglist from June
http://mail.gnu.org/pipermail/bug-grub/2002-June/007583.html


Hints on how to proceed in diagnosing what the error may be would be preciated.

Follow-up Comments
*******************

-------------------------------------------------------
Date: 2002-Sep-13 13:15             By: hno
Because the serial redirection of these boards is crap, only useful for getting 
access to the BIOS in emergencies. Having native serial is highly preferable. 
The BIOS redirection does some kind of screen scraping to detect screen updates 
and often misses stuff.

The BIOS is somehow supposed to detect when the application uses the serial.

Should perhaps note that the serial support of LILO seems to work just fine 
even with BIOS console redirection enabled, and so does DOS. To my knowledge it 
is only GRUB who crashes..

Note: The serverity is of this bug is only minor. But until it is fixed it 
might be good to know that there is such issues and is why I registered the bug 
report.

-------------------------------------------------------
Date: 2002-Sep-13 09:56             By: okuji
As GRUB modifies the status of a serial controller when
initializing it, I think anything wrong could happen.

BTW, I'm wondering why you want to enable GRUB's own
serial support, if your BIOS supports serial console
transparently.

Thanks,
Okuji


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